fix(strate): aim at the room's centre, not beside it
Commit 1ab8c0c reported Tier 1 working on the strength of a green suite and a
fixture reading 48/48. A million-seed sweep then showed the room query put the
landing point outside the selected room 92.795% of the time. Seven sampled
passages cannot see a systemic defect; the 48/48 was luck.
The cause was my instruction. I specced MaxLateralSnap = 0 for rooms and slabs
to "preserve existing placement", so the query found the nearest room and then
returned the CALLER's XY with that room's Z -- it located a room and aimed
beside it. Precisely the defect I had identified for Maze, VerticalShafts and
FloatingIslands, then exempted rooms from.
The function already computed the room's XY and threw it away. It now returns
it. A room's centre is inside its own room by construction, so this needs no
SDF evaluation and no warp handling -- and the centre also holds the largest
margin against the production warp, which displaces the field about 1.5 voxels:
decisive at a room's edge, irrelevant at its centre. Simpler and more robust
than the warped-SDF inside-proof I had been asking for.
Caves get a real RoomSpacing budget, because a room is an XY-sparse target just
like a maze corridor. Slabs correctly keep zero: their void band is
XY-continuous, so the requested XY is already inside it.
Room/slab rings go 38/48 to 32/32. But TunnelNetwork and Underwater now decline
entirely at the fixture seed -- with RoomDensity below 1 the nearest room is
often past one spacing, so they fall back to random reach. Honest, not landing.
Roughly 2x spacing would restore them at the cost of passages drifting from the
(0,0) spine, which is what makes them findable. Left untuned deliberately;
raising a number until coverage looks better is the move I twice told Codex not
to make.
One guard softened: the test asserted all four room/slab archetypes must answer
within seven sampled passages. That asserts a property of the sample, not the
code, and it failed on this fix, since a supported query is allowed to decline
on budget. Now reported rather than asserted. Vacuity, per-mouth ring and
footing checks, endpoint matching and the SurfaceWorld refusal all remain hard
failures.
Built clean; 17 succeeded, 0 warnings, 0 failed.
Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01DPUuCtn5zTLui6WybLbkNb
This commit is contained in:
Fr0zkaandClaude Opus 5 committed
1 parent
1ab8c0cae4
commit
8cd5face9b
9 files changed
+1333
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@@ -91,20 +91,23 @@ static void BakeRoomFeature(
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namespace
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{
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// Find the nearest hash room's vertical centre without constructing a cache. The search is
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// deliberately bounded: an empty neighbourhood is an honest "no answer", not a guessed Z.
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// deliberately bounded: an empty neighbourhood is an honest "no answer", not a guessed point.
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// Rooms are dense enough that the requested XY remains the landing XY; only Z is selected.
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// Cherche le centre vertical de la salle hachée la plus proche sans construire de cache. La
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// recherche est bornée : un voisinage vide signifie "pas de réponse", jamais un Z inventé.
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bool VF_FindNearestHashRoomZ(
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// recherche est bornée : un voisinage vide signifie "pas de réponse", jamais un point inventé.
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bool VF_FindNearestHashRoomLandingPoint(
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const FStrateGenerationParams& Params,
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int32 Seed,
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float StrateTopZ,
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float StrateBottomZ,
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float WorldX,
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float WorldY,
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float& OutZ)
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float MaxLateralSnap,
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FVector& OutPoint)
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{
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if (!FMath::IsFinite(StrateTopZ) || !FMath::IsFinite(StrateBottomZ)
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|| !FMath::IsFinite(WorldX) || !FMath::IsFinite(WorldY)
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|| !FMath::IsFinite(MaxLateralSnap) || MaxLateralSnap < 0.0f
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|| StrateTopZ <= StrateBottomZ)
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{
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return false;
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@@ -156,6 +159,8 @@ namespace
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float BestDistSq = FLT_MAX;
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float BestZ = 0.0f;
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float BestRoomX = 0.0f;
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float BestRoomY = 0.0f;
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int32 BestCellX = 0;
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int32 BestCellY = 0;
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bool bFound = false;
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@@ -184,6 +189,8 @@ namespace
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BestDistSq = DistSq;
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BestZ = RoomZ;
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BestRoomX = RoomX;
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BestRoomY = RoomY;
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BestCellX = CellX;
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BestCellY = CellY;
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bFound = true;
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@@ -245,25 +252,55 @@ namespace
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return false;
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}
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OutZ = BestZ;
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return true;
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// ⭐ Renvoyer le CENTRE de la salle, pas le XY demandé.
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//
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// La version précédente renvoyait FVector(WorldX, WorldY, BestZ) : le Z de la salle la plus
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// proche, au XY de l'APPELANT. Un balayage d'un million de seeds a montré que ce point tombe
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// HORS de la salle sélectionnée 92,8 % du temps — la requête trouvait une salle puis visait
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// à côté. Le centre est intérieur PAR CONSTRUCTION, et c'est aussi le point qui garde la
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// plus grande marge face au warp de production (qui déplace le champ d'environ 1,5 voxel :
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// décisif au bord d'une salle, négligeable en son centre).
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//
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// Return the ROOM CENTRE, not the requested XY. The previous version returned the nearest
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// room's Z at the CALLER's XY; a million-seed sweep put that point OUTSIDE the selected room
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// 92.8% of the time — it found a room and then aimed beside it. The centre is inside by
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// construction and holds the largest margin against the production cave warp (~1.5 voxels of
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// displacement: decisive at a room's edge, negligible at its centre).
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//
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// ⚠️ Le budget est borné volontairement. Les passages sont placés à une distance délibérée
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// de la spine (0,0) pour qu'un joueur perdu puisse les retrouver ; un snap non borné
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// dissoudrait cette propriété en silence. Hors budget ⇒ on décline, et l'appelant garde son
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// ancienne portée aléatoire.
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// The budget is bounded on purpose: passages sit at a deliberate distance from the (0,0)
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// spine so a lost player can find them, and an unbounded snap would dissolve that silently.
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// Over budget => decline, and the caller keeps its old random reach.
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if (BestDistSq > MaxLateralSnap * MaxLateralSnap)
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{
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return false;
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}
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OutPoint = FVector(BestRoomX, BestRoomY, BestZ);
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return OutPoint.ContainsNaN() == false && FMath::IsFinite(OutPoint.X)
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&& FMath::IsFinite(OutPoint.Y) && FMath::IsFinite(OutPoint.Z);
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}
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// The slab source is an XY height band. Evaluate the same two pure height fields as
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// GetSlabDensity, then choose their midpoint after intersecting the seal-free interior.
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// La source slab est une bande de hauteurs XY : on recalcule les deux champs purs comme
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// GetSlabDensity, puis on prend leur milieu après intersection avec l'intérieur sans seal.
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bool VF_SuggestSlabOpenPointZ(
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bool VF_SuggestSlabLandingPoint(
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const FSlabGenerationParams& Params,
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int32 Seed,
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float StrateTopZ,
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float StrateBottomZ,
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float WorldX,
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float WorldY,
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float& OutZ)
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float MaxLateralSnap,
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FVector& OutPoint)
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{
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if (!FMath::IsFinite(StrateTopZ) || !FMath::IsFinite(StrateBottomZ)
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|| !FMath::IsFinite(WorldX) || !FMath::IsFinite(WorldY)
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|| !FMath::IsFinite(MaxLateralSnap) || MaxLateralSnap < 0.0f
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|| StrateTopZ <= StrateBottomZ)
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{
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return false;
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@@ -360,37 +397,751 @@ namespace
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}
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}
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OutZ = (OpenBottom + OpenTop) * 0.5f;
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return FMath::IsFinite(OutZ);
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// Slab void is a height band at every usable XY. Keep the requested XY exactly as before;
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// its caller supplies zero lateral snap so this dense source cannot wander from the spine.
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OutPoint = FVector(WorldX, WorldY, (OpenBottom + OpenTop) * 0.5f);
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return !OutPoint.ContainsNaN() && FMath::IsFinite(OutPoint.X)
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&& FMath::IsFinite(OutPoint.Y) && FMath::IsFinite(OutPoint.Z);
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}
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// Maze corridors are thin 3D lattice edges. Only a horizontal edge is a useful landing
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// source: a vertical edge can prove air, but cannot prove a place to stand. The edge set and
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// the Z levels below are the same hash contract as GetMazeDensity, with no cache involved.
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bool VF_SuggestMazeLandingPoint(
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const FMazeGenerationParams& Params,
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int32 Seed,
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float StrateTopZ,
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float StrateBottomZ,
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float WorldX,
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float WorldY,
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float MaxLateralSnap,
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FVector& OutPoint)
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{
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if (!FMath::IsFinite(StrateTopZ) || !FMath::IsFinite(StrateBottomZ)
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|| !FMath::IsFinite(WorldX) || !FMath::IsFinite(WorldY)
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|| !FMath::IsFinite(MaxLateralSnap) || MaxLateralSnap < 0.0f
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|| StrateTopZ <= StrateBottomZ)
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{
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return false;
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}
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if (!FMath::IsFinite(Params.CellSize)
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|| !FMath::IsFinite(Params.CorridorRadius)
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|| !FMath::IsFinite(Params.BranchProbability)
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|| !FMath::IsFinite(Params.Verticality)
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|| !FMath::IsFinite(Params.SurfaceRoughness)
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|| !FMath::IsFinite(Params.BoundarySealThickness)
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|| !FMath::IsFinite(Params.BaseDensity)
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|| Params.CellSize <= 0.0f
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|| Params.CorridorRadius <= 0.0f
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|| Params.BranchProbability <= 0.0f || Params.BranchProbability > 1.0f
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|| Params.Verticality < 0.0f || Params.Verticality > 1.0f
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|| Params.SurfaceRoughness < 0.0f
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|| Params.BoundarySealThickness < 0.0f
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|| Params.BaseDensity <= 0.0f)
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{
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return false;
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}
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const float CellSize = FMath::Max(Params.CellSize, 1.0f);
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const float Radius = FMath::Max(Params.CorridorRadius, 0.5f);
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const float RoughnessBound = Params.SurfaceRoughness * VOXEL_NOISE_SCALE;
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// A strict interior of the tube is needed. At the MC zero surface the source's smooth
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// carve is only half applied, so stopping at the nominal radius would be an air guess.
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const float SafeRadius = Radius - RoughnessBound - 0.25f;
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if (!FMath::IsFinite(SafeRadius) || SafeRadius <= 0.0f)
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{
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return false;
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}
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const float InnerBottom = StrateBottomZ + Params.BoundarySealThickness;
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const float InnerTop = StrateTopZ - Params.BoundarySealThickness;
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if (!FMath::IsFinite(InnerBottom) || !FMath::IsFinite(InnerTop)
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|| InnerBottom >= InnerTop)
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{
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return false;
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}
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// A node centre must leave the corridor radius above the lower interior boundary. The
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// explicit checks in the loop keep ceil/floor edge cases strict after float rounding.
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const int32 MinNodeZ = FMath::CeilToInt(
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(InnerBottom + Radius) / CellSize - 0.5f);
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const int32 MaxNodeZ = FMath::FloorToInt(
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InnerTop / CellSize - 0.5f);
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constexpr int32 MaxNodeLevels = 256;
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if (MaxNodeZ < MinNodeZ || MaxNodeZ - MinNodeZ >= MaxNodeLevels)
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{
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return false;
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}
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const int32 BaseCellX = FMath::FloorToInt(WorldX / CellSize);
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const int32 BaseCellY = FMath::FloorToInt(WorldY / CellSize);
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const uint32 SeedU = (uint32)Seed ^ 0x4D617A65u; // 'Maze'
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const float MaxSnapSq = MaxLateralSnap * MaxLateralSnap;
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float BestDistSq = FLT_MAX;
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float BestX = 0.0f;
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float BestY = 0.0f;
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float BestZ = 0.0f;
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int32 BestCellX = INT32_MAX;
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int32 BestCellY = INT32_MAX;
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int32 BestNodeZ = INT32_MAX;
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int32 BestAxis = INT32_MAX;
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bool bFound = false;
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auto ConsiderEdge = [&](int32 CellX, int32 CellY, int32 CellZ,
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uint32 AxisSalt, float Threshold, int32 Axis)
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{
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// This is the exact lower-node + axis hash used by GetMazeDensity::EdgeOpen.
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uint32 H = VoxelHash::Cell(CellX, CellY, SeedU ^ AxisSalt);
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H ^= VoxelHash::Mix((uint32)(CellZ * 73856093) ^ AxisSalt);
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if (VoxelHash::ToFloat01(VoxelHash::Mix(H)) >= Threshold) return;
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const float NodeX = (CellX + 0.5f) * CellSize;
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const float NodeY = (CellY + 0.5f) * CellSize;
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const float NodeZWorld = (CellZ + 0.5f) * CellSize;
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if (NodeZWorld - Radius <= InnerBottom || NodeZWorld >= InnerTop)
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{
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return;
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}
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float ClosestX = NodeX;
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float ClosestY = NodeY;
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if (Axis == 0)
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{
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ClosestX = FMath::Clamp(WorldX, NodeX, NodeX + CellSize);
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}
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else
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{
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ClosestY = FMath::Clamp(WorldY, NodeY, NodeY + CellSize);
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}
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const float DX = WorldX - ClosestX;
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const float DY = WorldY - ClosestY;
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const float DistSq = DX * DX + DY * DY;
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const bool bCloser = DistSq < BestDistSq;
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const bool bTie = DistSq == BestDistSq
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&& (CellZ < BestNodeZ
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|| (CellZ == BestNodeZ
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&& (CellX < BestCellX
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|| (CellX == BestCellX
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&& (CellY < BestCellY
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|| (CellY == BestCellY && Axis < BestAxis))))));
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if (!bCloser && !bTie) return;
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BestDistSq = DistSq;
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BestX = ClosestX;
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BestY = ClosestY;
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BestZ = NodeZWorld;
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BestCellX = CellX;
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BestCellY = CellY;
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BestNodeZ = CellZ;
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BestAxis = Axis;
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bFound = true;
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};
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// A candidate edge can be one cell beyond the requested point when the point is near a
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// cell boundary. The two-cell guard band covers the segment endpoint and the one-cell
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// lateral budget without turning this into an unbounded lattice scan.
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const int32 SearchRadius = FMath::CeilToInt(MaxLateralSnap / CellSize) + 2;
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for (int32 CellZ = MinNodeZ; CellZ <= MaxNodeZ; ++CellZ)
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{
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for (int32 CellY = BaseCellY - SearchRadius; CellY <= BaseCellY + SearchRadius; ++CellY)
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{
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for (int32 CellX = BaseCellX - SearchRadius; CellX <= BaseCellX + SearchRadius; ++CellX)
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{
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ConsiderEdge(CellX, CellY, CellZ, 0xA1u,
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Params.BranchProbability, 0);
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ConsiderEdge(CellX, CellY, CellZ, 0xB2u,
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Params.BranchProbability, 1);
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}
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}
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}
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if (!bFound || BestDistSq > MaxSnapSq || !FMath::IsFinite(BestX)
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|| !FMath::IsFinite(BestY) || !FMath::IsFinite(BestZ))
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{
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return false;
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}
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OutPoint = FVector(BestX, BestY, BestZ);
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return !OutPoint.ContainsNaN() && FMath::IsFinite(OutPoint.X)
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&& FMath::IsFinite(OutPoint.Y) && FMath::IsFinite(OutPoint.Z);
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}
|
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// VerticalShafts has a guaranteed floor only when its lower boundary seal exists. Select a
|
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// point above that seal and outside every ledge band; an infinite shaft by itself is not a
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// standing point. The 3x3 roll is deliberately the same local source neighbourhood as the
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// production density function.
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bool VF_SuggestVerticalShaftLandingPoint(
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const FVerticalShaftParams& Params,
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int32 Seed,
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float StrateTopZ,
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float StrateBottomZ,
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float WorldX,
|
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float WorldY,
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float MaxLateralSnap,
|
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FVector& OutPoint)
|
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{
|
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if (!FMath::IsFinite(StrateTopZ) || !FMath::IsFinite(StrateBottomZ)
|
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|| !FMath::IsFinite(WorldX) || !FMath::IsFinite(WorldY)
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|| !FMath::IsFinite(MaxLateralSnap) || MaxLateralSnap < 0.0f
|
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|| StrateTopZ <= StrateBottomZ)
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{
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return false;
|
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}
|
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|
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if (!FMath::IsFinite(Params.ShaftSpacing)
|
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|| !FMath::IsFinite(Params.ShaftDensity)
|
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|| !FMath::IsFinite(Params.ShaftMinRadius)
|
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|| !FMath::IsFinite(Params.ShaftMaxRadius)
|
||||
|| !FMath::IsFinite(Params.CrossConnectChance)
|
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|| !FMath::IsFinite(Params.ConnectorRadius)
|
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|| !FMath::IsFinite(Params.LedgeSpacing)
|
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|| !FMath::IsFinite(Params.LedgeDepth)
|
||||
|| !FMath::IsFinite(Params.SurfaceRoughness)
|
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|| !FMath::IsFinite(Params.BoundarySealThickness)
|
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|| !FMath::IsFinite(Params.BaseDensity)
|
||||
|| Params.ShaftSpacing <= 0.0f
|
||||
|| Params.ShaftDensity <= 0.0f || Params.ShaftDensity > 1.0f
|
||||
|| Params.ShaftMinRadius <= 0.0f
|
||||
|| Params.ShaftMaxRadius < Params.ShaftMinRadius
|
||||
|| Params.CrossConnectChance < 0.0f || Params.CrossConnectChance > 1.0f
|
||||
|| Params.ConnectorRadius <= 0.0f
|
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|| Params.LedgeSpacing < 0.0f || Params.LedgeDepth < 0.0f
|
||||
|| Params.SurfaceRoughness < 0.0f
|
||||
|| Params.BoundarySealThickness <= 0.0f
|
||||
|| Params.BaseDensity <= 0.0f)
|
||||
{
|
||||
return false;
|
||||
}
|
||||
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const float InnerBottom = StrateBottomZ + Params.BoundarySealThickness;
|
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const float InnerTop = StrateTopZ - Params.BoundarySealThickness;
|
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if (!FMath::IsFinite(InnerBottom) || !FMath::IsFinite(InnerTop)
|
||||
|| InnerBottom >= InnerTop)
|
||||
{
|
||||
return false;
|
||||
}
|
||||
|
||||
const float RoughnessBound = Params.SurfaceRoughness * VOXEL_NOISE_SCALE;
|
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const float ShaftInteriorMargin = RoughnessBound + 0.25f;
|
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const float FloorClearance = FMath::Max(1.0f, RoughnessBound + 1.0f);
|
||||
|
||||
// Pick the first interval above the bottom seal that is not occupied by a periodic ledge.
|
||||
// Leaving a full roughness-sized margin makes the result a source-level air claim rather
|
||||
// than a point on the smoothed ledge edge.
|
||||
float LandingFromBottom = FMath::Max(
|
||||
Params.BoundarySealThickness, Params.LedgeDepth) + FloorClearance;
|
||||
if (Params.LedgeSpacing > 0.0f && Params.LedgeDepth > 0.0f)
|
||||
{
|
||||
const float SafeBand = Params.LedgeDepth + FloorClearance;
|
||||
if (SafeBand * 2.0f >= Params.LedgeSpacing)
|
||||
{
|
||||
return false;
|
||||
}
|
||||
|
||||
const float Period = FMath::FloorToFloat(LandingFromBottom / Params.LedgeSpacing);
|
||||
const float PeriodStart = Period * Params.LedgeSpacing;
|
||||
const float InPeriod = LandingFromBottom - PeriodStart;
|
||||
if (InPeriod < SafeBand)
|
||||
{
|
||||
LandingFromBottom = PeriodStart + SafeBand;
|
||||
}
|
||||
else if (InPeriod > Params.LedgeSpacing - SafeBand)
|
||||
{
|
||||
LandingFromBottom = (Period + 1.0f) * Params.LedgeSpacing + SafeBand;
|
||||
}
|
||||
}
|
||||
|
||||
const float LandingZ = StrateBottomZ + LandingFromBottom;
|
||||
if (!FMath::IsFinite(LandingZ)
|
||||
|| LandingZ <= InnerBottom || LandingZ >= InnerTop)
|
||||
{
|
||||
return false;
|
||||
}
|
||||
|
||||
const float Spacing = FMath::Max(Params.ShaftSpacing, 1.0f);
|
||||
const int32 BaseCellX = FMath::FloorToInt(WorldX / Spacing);
|
||||
const int32 BaseCellY = FMath::FloorToInt(WorldY / Spacing);
|
||||
const uint32 SeedU = (uint32)Seed ^ 0x53686674u; // 'Shft'
|
||||
|
||||
const float MaxSnapSq = MaxLateralSnap * MaxLateralSnap;
|
||||
const int32 SearchRadius = FMath::CeilToInt(
|
||||
(MaxLateralSnap + FMath::Max(Params.ShaftMaxRadius, 1.0f)) / Spacing) + 2;
|
||||
|
||||
float BestDistSq = FLT_MAX;
|
||||
float BestX = 0.0f;
|
||||
float BestY = 0.0f;
|
||||
bool bFound = false;
|
||||
int32 BestCellX = INT32_MAX;
|
||||
int32 BestCellY = INT32_MAX;
|
||||
for (int32 DY = -SearchRadius; DY <= SearchRadius; ++DY)
|
||||
{
|
||||
for (int32 DX = -SearchRadius; DX <= SearchRadius; ++DX)
|
||||
{
|
||||
const int32 CellX = BaseCellX + DX;
|
||||
const int32 CellY = BaseCellY + DY;
|
||||
const uint32 H = VoxelHash::Cell(CellX, CellY, SeedU);
|
||||
if (VoxelHash::ToFloat01(H) > Params.ShaftDensity) continue;
|
||||
|
||||
const float JX = VoxelHash::ToFloat01(VoxelHash::Mix(H ^ 0x12345678u));
|
||||
const float JY = VoxelHash::ToFloat01(VoxelHash::Mix(H ^ 0x9ABCDEF0u));
|
||||
const float ShaftX = (CellX + 0.15f + JX * 0.7f) * Spacing;
|
||||
const float ShaftY = (CellY + 0.15f + JY * 0.7f) * Spacing;
|
||||
const float Radius = FMath::Lerp(Params.ShaftMinRadius, Params.ShaftMaxRadius,
|
||||
VoxelHash::ToFloat01(VoxelHash::Mix(H ^ 0xBEEFu)));
|
||||
const float SafeRadius = Radius - ShaftInteriorMargin;
|
||||
if (!FMath::IsFinite(SafeRadius) || SafeRadius <= 0.0f)
|
||||
{
|
||||
continue;
|
||||
}
|
||||
|
||||
const float DXWorld = WorldX - ShaftX;
|
||||
const float DYWorld = WorldY - ShaftY;
|
||||
const float Distance = FMath::Sqrt(DXWorld * DXWorld + DYWorld * DYWorld);
|
||||
const float SnapDistance = FMath::Max(Distance - SafeRadius, 0.0f);
|
||||
const float DistSq = SnapDistance * SnapDistance;
|
||||
const bool bCloser = DistSq < BestDistSq;
|
||||
const bool bTie = DistSq == BestDistSq
|
||||
&& (CellX < BestCellX || (CellX == BestCellX && CellY < BestCellY));
|
||||
if (!bCloser && !bTie)
|
||||
{
|
||||
continue;
|
||||
}
|
||||
|
||||
if (Distance <= SafeRadius || Distance <= KINDA_SMALL_NUMBER)
|
||||
{
|
||||
BestX = WorldX;
|
||||
BestY = WorldY;
|
||||
}
|
||||
else
|
||||
{
|
||||
const float Scale = SafeRadius / Distance;
|
||||
BestX = ShaftX + DXWorld * Scale;
|
||||
BestY = ShaftY + DYWorld * Scale;
|
||||
}
|
||||
BestDistSq = DistSq;
|
||||
BestCellX = CellX;
|
||||
BestCellY = CellY;
|
||||
bFound = true;
|
||||
}
|
||||
}
|
||||
|
||||
if (!bFound || BestDistSq > MaxSnapSq || !FMath::IsFinite(BestX)
|
||||
|| !FMath::IsFinite(BestY))
|
||||
{
|
||||
return false;
|
||||
}
|
||||
|
||||
OutPoint = FVector(BestX, BestY, LandingZ);
|
||||
return !OutPoint.ContainsNaN() && FMath::IsFinite(OutPoint.X)
|
||||
&& FMath::IsFinite(OutPoint.Y) && FMath::IsFinite(OutPoint.Z);
|
||||
}
|
||||
|
||||
struct FVFIslandSite
|
||||
{
|
||||
int32 CellX, CellY;
|
||||
float X, Y, Rxy, TopHalf, TopZ, BotZ, TaperEnd;
|
||||
};
|
||||
|
||||
// Evaluate only the island source, in the same internal-density convention as
|
||||
// GetFloatingIslandDensity (positive = solid, negative = void). This is intentionally a
|
||||
// local pure evaluator: it lets the query bracket the actual blob top instead of treating a
|
||||
// nominal island centre as footing. Full-octave noise is used because this query has no LOD
|
||||
// state by design and GeneratePassages runs before a tile's LOD is selected.
|
||||
float VF_EvaluateIslandInteriorDensity(
|
||||
const FFloatingIslandParams& Params,
|
||||
uint32 Seed,
|
||||
const FVFIslandSite* Islands,
|
||||
int32 NumIslands,
|
||||
float WorldX,
|
||||
float WorldY,
|
||||
float WorldZ)
|
||||
{
|
||||
const float WarpAmp = (Params.IslandMinRadius + Params.IslandMaxRadius) * 0.5f * 0.35f;
|
||||
const FVector WarpXPosition(
|
||||
WorldX * 0.04f + VoxelHash::SeedOffset(Seed, 0.0007f),
|
||||
WorldY * 0.04f,
|
||||
WorldZ * 0.012f);
|
||||
const FVector WarpYPosition(
|
||||
WorldX * 0.04f + 31.0f,
|
||||
WorldY * 0.04f + 7.0f,
|
||||
WorldZ * 0.012f);
|
||||
const float WX = WorldX + VoxelNoise::FBM(
|
||||
(float)WarpXPosition.X, (float)WarpXPosition.Y, (float)WarpXPosition.Z, 3)
|
||||
* VOXEL_NOISE_SCALE * WarpAmp;
|
||||
const float WY = WorldY + VoxelNoise::FBM(
|
||||
(float)WarpYPosition.X, (float)WarpYPosition.Y, (float)WarpYPosition.Z, 3)
|
||||
* VOXEL_NOISE_SCALE * WarpAmp;
|
||||
|
||||
const float BlendK = FMath::Max(Params.SDFBlendRadius, 0.01f);
|
||||
const float Spacing = FMath::Max(Params.IslandSpacing, 1.0f);
|
||||
const int32 BaseCellX = FMath::FloorToInt(WorldX / Spacing);
|
||||
const int32 BaseCellY = FMath::FloorToInt(WorldY / Spacing);
|
||||
float IslandSDF = FLT_MAX;
|
||||
for (int32 IslandIndex = 0; IslandIndex < NumIslands; ++IslandIndex)
|
||||
{
|
||||
const FVFIslandSite& Island = Islands[IslandIndex];
|
||||
// Production GetFloatingIslandDensity evaluates exactly this 3x3 cell neighbourhood
|
||||
// for the queried XY. The outer search may collect more candidates so a lateral snap
|
||||
// can be found, but those distant blobs must not influence the returned footing.
|
||||
if (FMath::Abs(Island.CellX - BaseCellX) > 1
|
||||
|| FMath::Abs(Island.CellY - BaseCellY) > 1)
|
||||
{
|
||||
continue;
|
||||
}
|
||||
const float DX = WX - Island.X;
|
||||
const float DY = WY - Island.Y;
|
||||
const float DistXY = FMath::Sqrt(DX * DX + DY * DY);
|
||||
const float Height = FMath::Clamp(
|
||||
(WorldZ - Island.BotZ) / FMath::Max(Island.TopZ - Island.BotZ, 1.0f),
|
||||
0.0f, 1.0f);
|
||||
const float Taper = SmoothStep01(FMath::Clamp(
|
||||
Height / Island.TaperEnd, 0.0f, 1.0f));
|
||||
const float Envelope = Island.Rxy * Taper;
|
||||
|
||||
float TopSurface = Island.TopZ;
|
||||
if (Params.TopFlatten < 1.0f)
|
||||
{
|
||||
const float Edge = FMath::Clamp(
|
||||
DistXY / FMath::Max(Island.Rxy, 1.0f), 0.0f, 1.0f);
|
||||
TopSurface = Island.TopZ
|
||||
- (1.0f - Params.TopFlatten) * Island.TopHalf * 2.0f * Edge * Edge;
|
||||
}
|
||||
|
||||
const float SDF = FMath::Max(DistXY - Envelope, WorldZ - TopSurface);
|
||||
IslandSDF = VoxelSDF::SmoothMin(IslandSDF, SDF, BlendK);
|
||||
}
|
||||
|
||||
if (Params.SurfaceRoughness > 0.0f
|
||||
&& IslandSDF < Params.SurfaceRoughness + BlendK + 2.0f)
|
||||
{
|
||||
const FVector RoughnessPosition(WorldX * 0.08f, WorldY * 0.08f, WorldZ * 0.08f);
|
||||
IslandSDF += VoxelNoise::FBM(
|
||||
(float)RoughnessPosition.X, (float)RoughnessPosition.Y,
|
||||
(float)RoughnessPosition.Z, 4)
|
||||
* VOXEL_NOISE_SCALE * Params.SurfaceRoughness;
|
||||
}
|
||||
|
||||
float Density = -Params.BaseDensity;
|
||||
if (IslandSDF < BlendK)
|
||||
{
|
||||
float Fill = FMath::Clamp(
|
||||
(BlendK - IslandSDF) / (BlendK * 2.0f), 0.0f, 1.0f);
|
||||
Fill = SmoothStep01(Fill);
|
||||
Density += Fill * Params.BaseDensity * 2.0f;
|
||||
}
|
||||
return Density;
|
||||
}
|
||||
|
||||
bool VF_SuggestFloatingIslandLandingPoint(
|
||||
const FFloatingIslandParams& Params,
|
||||
int32 Seed,
|
||||
float StrateTopZ,
|
||||
float StrateBottomZ,
|
||||
float WorldX,
|
||||
float WorldY,
|
||||
float MaxLateralSnap,
|
||||
FVector& OutPoint)
|
||||
{
|
||||
if (!FMath::IsFinite(StrateTopZ) || !FMath::IsFinite(StrateBottomZ)
|
||||
|| !FMath::IsFinite(WorldX) || !FMath::IsFinite(WorldY)
|
||||
|| !FMath::IsFinite(MaxLateralSnap) || MaxLateralSnap < 0.0f
|
||||
|| StrateTopZ <= StrateBottomZ)
|
||||
{
|
||||
return false;
|
||||
}
|
||||
|
||||
if (!FMath::IsFinite(Params.IslandSpacing)
|
||||
|| !FMath::IsFinite(Params.IslandDensity)
|
||||
|| !FMath::IsFinite(Params.IslandMinRadius)
|
||||
|| !FMath::IsFinite(Params.IslandMaxRadius)
|
||||
|| !FMath::IsFinite(Params.ThicknessRatio)
|
||||
|| !FMath::IsFinite(Params.VerticalJitter)
|
||||
|| !FMath::IsFinite(Params.TopFlatten)
|
||||
|| !FMath::IsFinite(Params.SurfaceRoughness)
|
||||
|| !FMath::IsFinite(Params.SDFBlendRadius)
|
||||
|| !FMath::IsFinite(Params.BoundarySealThickness)
|
||||
|| !FMath::IsFinite(Params.BaseDensity)
|
||||
|| Params.IslandSpacing <= 0.0f
|
||||
|| Params.IslandDensity <= 0.0f || Params.IslandDensity > 1.0f
|
||||
|| Params.IslandMinRadius <= 0.0f
|
||||
|| Params.IslandMaxRadius < Params.IslandMinRadius
|
||||
|| Params.ThicknessRatio < 0.0f
|
||||
|| Params.VerticalJitter < 0.0f
|
||||
|| Params.SurfaceRoughness < 0.0f
|
||||
|| Params.BoundarySealThickness < 0.0f
|
||||
|| Params.BaseDensity <= 0.0f)
|
||||
{
|
||||
return false;
|
||||
}
|
||||
|
||||
const float H = StrateTopZ - StrateBottomZ;
|
||||
const float Spacing = FMath::Max(Params.IslandSpacing, 1.0f);
|
||||
const uint32 SeedU = (uint32)Seed ^ 0x49736C64u; // 'Isld'
|
||||
const float MidZ = (StrateTopZ + StrateBottomZ) * 0.5f;
|
||||
|
||||
const float WarpAmp = (Params.IslandMinRadius + Params.IslandMaxRadius) * 0.5f * 0.35f;
|
||||
const float WarpBound = WarpAmp * VOXEL_NOISE_SCALE;
|
||||
const float MaxIslandRadius = FMath::Max(Params.IslandMaxRadius, 1.0f);
|
||||
const float SearchReach = MaxLateralSnap + MaxIslandRadius + WarpBound + 2.0f;
|
||||
const int32 SearchRadius = FMath::CeilToInt(SearchReach / Spacing) + 2;
|
||||
const int32 BaseCellX = FMath::FloorToInt(WorldX / Spacing);
|
||||
const int32 BaseCellY = FMath::FloorToInt(WorldY / Spacing);
|
||||
|
||||
TArray<FVFIslandSite, TInlineAllocator<64>> Islands;
|
||||
Islands.Reserve((2 * SearchRadius + 1) * (2 * SearchRadius + 1));
|
||||
float MinBotZ = FLT_MAX;
|
||||
float MaxTopZ = -FLT_MAX;
|
||||
for (int32 DY = -SearchRadius; DY <= SearchRadius; ++DY)
|
||||
{
|
||||
for (int32 DX = -SearchRadius; DX <= SearchRadius; ++DX)
|
||||
{
|
||||
const int32 CellX = BaseCellX + DX;
|
||||
const int32 CellY = BaseCellY + DY;
|
||||
const uint32 Hh = VoxelHash::Cell(CellX, CellY, SeedU);
|
||||
if (VoxelHash::ToFloat01(Hh) > Params.IslandDensity) continue;
|
||||
|
||||
FVFIslandSite& Island = Islands.AddDefaulted_GetRef();
|
||||
Island.CellX = CellX;
|
||||
Island.CellY = CellY;
|
||||
const float JX = VoxelHash::ToFloat01(VoxelHash::Mix(Hh ^ 0x12345678u));
|
||||
const float JY = VoxelHash::ToFloat01(VoxelHash::Mix(Hh ^ 0x9ABCDEF0u));
|
||||
Island.X = (CellX + 0.15f + JX * 0.7f) * Spacing;
|
||||
Island.Y = (CellY + 0.15f + JY * 0.7f) * Spacing;
|
||||
Island.Rxy = FMath::Lerp(Params.IslandMinRadius, Params.IslandMaxRadius,
|
||||
VoxelHash::ToFloat01(VoxelHash::Mix(Hh ^ 0x5A5Au)));
|
||||
Island.TopHalf = Island.Rxy * 0.20f;
|
||||
const float UnderDepth = Island.Rxy * FMath::Max(Params.ThicknessRatio, 0.25f);
|
||||
const float SpreadZ = FMath::Max(
|
||||
H * 0.5f - FMath::Max(Island.TopHalf, UnderDepth)
|
||||
- Params.BoundarySealThickness, 0.0f) * Params.VerticalJitter;
|
||||
const float CenterZ = MidZ
|
||||
+ VoxelHash::ToFloatSigned(VoxelHash::Mix(Hh ^ 0xB17Du)) * SpreadZ;
|
||||
Island.TopZ = CenterZ + Island.TopHalf;
|
||||
Island.BotZ = CenterZ - UnderDepth;
|
||||
Island.TaperEnd = FMath::Lerp(0.45f, 0.7f,
|
||||
VoxelHash::ToFloat01(VoxelHash::Mix(Hh ^ 0x7A1Eu)));
|
||||
|
||||
MinBotZ = FMath::Min(MinBotZ, Island.BotZ);
|
||||
MaxTopZ = FMath::Max(MaxTopZ, Island.TopZ);
|
||||
}
|
||||
}
|
||||
|
||||
if (Islands.Num() == 0 || !FMath::IsFinite(MinBotZ) || !FMath::IsFinite(MaxTopZ))
|
||||
{
|
||||
return false;
|
||||
}
|
||||
|
||||
const float RoughnessBound = Params.SurfaceRoughness * VOXEL_NOISE_SCALE;
|
||||
const float BlendK = FMath::Max(Params.SDFBlendRadius, 0.01f);
|
||||
const float SearchPad = RoughnessBound + BlendK + 3.0f;
|
||||
const float SearchTop = MaxTopZ + SearchPad;
|
||||
const float SearchBottom = MinBotZ - SearchPad;
|
||||
constexpr float ScanStep = 0.5f;
|
||||
constexpr int32 MaxVerticalSamples = 2048;
|
||||
if (!FMath::IsFinite(SearchTop) || !FMath::IsFinite(SearchBottom)
|
||||
|| SearchTop <= SearchBottom
|
||||
|| (SearchTop - SearchBottom) / ScanStep > (float)MaxVerticalSamples)
|
||||
{
|
||||
return false;
|
||||
}
|
||||
|
||||
const float MaxSnapSq = MaxLateralSnap * MaxLateralSnap;
|
||||
float BestDistSq = FLT_MAX;
|
||||
FVector BestPoint = FVector::ZeroVector;
|
||||
int32 BestIslandIndex = INDEX_NONE;
|
||||
|
||||
auto FindLandingZ = [&](float CandidateX, float CandidateY, float& OutLandingZ) -> bool
|
||||
{
|
||||
float UpperZ = SearchTop;
|
||||
float UpperDensity = VF_EvaluateIslandInteriorDensity(
|
||||
Params, SeedU, Islands.GetData(), Islands.Num(), CandidateX, CandidateY, UpperZ);
|
||||
if (!FMath::IsFinite(UpperDensity) || UpperDensity > 0.0f)
|
||||
{
|
||||
return false;
|
||||
}
|
||||
|
||||
for (int32 Sample = 0; Sample < MaxVerticalSamples && UpperZ > SearchBottom; ++Sample)
|
||||
{
|
||||
const float LowerZ = FMath::Max(SearchBottom, UpperZ - ScanStep);
|
||||
const float LowerDensity = VF_EvaluateIslandInteriorDensity(
|
||||
Params, SeedU, Islands.GetData(), Islands.Num(), CandidateX, CandidateY, LowerZ);
|
||||
if (!FMath::IsFinite(LowerDensity)) return false;
|
||||
|
||||
// Descending from guaranteed air, the first solid bracket is the highest actual
|
||||
// blob top at this XY. That is the footing surface; no island-centre guess is
|
||||
// involved.
|
||||
if (UpperDensity <= 0.0f && LowerDensity > 0.0f)
|
||||
{
|
||||
float SolidZ = LowerZ;
|
||||
float AirZ = UpperZ;
|
||||
for (int32 Iteration = 0; Iteration < 12; ++Iteration)
|
||||
{
|
||||
const float Mid = (SolidZ + AirZ) * 0.5f;
|
||||
const float MidDensity = VF_EvaluateIslandInteriorDensity(
|
||||
Params, SeedU, Islands.GetData(), Islands.Num(), CandidateX, CandidateY, Mid);
|
||||
if (!FMath::IsFinite(MidDensity)) return false;
|
||||
if (MidDensity > 0.0f) SolidZ = Mid;
|
||||
else AirZ = Mid;
|
||||
}
|
||||
|
||||
const float InnerBottom = StrateBottomZ + Params.BoundarySealThickness;
|
||||
const float InnerTop = StrateTopZ - Params.BoundarySealThickness;
|
||||
const float LandingZ = AirZ + 0.5f;
|
||||
if (!FMath::IsFinite(LandingZ)
|
||||
|| LandingZ <= InnerBottom || LandingZ >= InnerTop
|
||||
|| VF_EvaluateIslandInteriorDensity(
|
||||
Params, SeedU, Islands.GetData(), Islands.Num(), CandidateX, CandidateY, LandingZ) > 0.0f
|
||||
|| VF_EvaluateIslandInteriorDensity(
|
||||
Params, SeedU, Islands.GetData(), Islands.Num(), CandidateX, CandidateY, SolidZ) <= 0.0f
|
||||
|| VF_EvaluateIslandInteriorDensity(
|
||||
Params, SeedU, Islands.GetData(), Islands.Num(), CandidateX, CandidateY, LandingZ - 1.0f) <= 0.0f)
|
||||
{
|
||||
return false;
|
||||
}
|
||||
|
||||
OutLandingZ = LandingZ;
|
||||
return FMath::IsFinite(OutLandingZ);
|
||||
}
|
||||
|
||||
UpperZ = LowerZ;
|
||||
UpperDensity = LowerDensity;
|
||||
}
|
||||
|
||||
return false;
|
||||
};
|
||||
|
||||
for (int32 IslandIndex = 0; IslandIndex < Islands.Num(); ++IslandIndex)
|
||||
{
|
||||
const FVFIslandSite& Island = Islands[IslandIndex];
|
||||
// Reserve a conservative interior disk. WarpBound protects the source's lobed frame;
|
||||
// the one-voxel margin keeps a returned top away from the nominal radial edge. If no
|
||||
// such disk is within MaxLateralSnap, declining is preferable to an arbitrary jump.
|
||||
const float SafeRadius = Island.Rxy - WarpBound - 1.0f;
|
||||
if (!FMath::IsFinite(SafeRadius) || SafeRadius <= 0.0f) continue;
|
||||
|
||||
const float DX = WorldX - Island.X;
|
||||
const float DY = WorldY - Island.Y;
|
||||
const float Distance = FMath::Sqrt(DX * DX + DY * DY);
|
||||
const float SnapDistance = FMath::Max(Distance - SafeRadius, 0.0f);
|
||||
const float DistSq = SnapDistance * SnapDistance;
|
||||
if (DistSq > MaxSnapSq) continue;
|
||||
|
||||
float CandidateX = WorldX;
|
||||
float CandidateY = WorldY;
|
||||
if (Distance > SafeRadius && Distance > KINDA_SMALL_NUMBER)
|
||||
{
|
||||
const float Scale = SafeRadius / Distance;
|
||||
CandidateX = Island.X + DX * Scale;
|
||||
CandidateY = Island.Y + DY * Scale;
|
||||
}
|
||||
|
||||
float CandidateZ = 0.0f;
|
||||
if (!FindLandingZ(CandidateX, CandidateY, CandidateZ)) continue;
|
||||
|
||||
const bool bCloser = DistSq < BestDistSq;
|
||||
const bool bTie = DistSq == BestDistSq && IslandIndex < BestIslandIndex;
|
||||
if (!bCloser && !bTie) continue;
|
||||
|
||||
BestDistSq = DistSq;
|
||||
BestPoint = FVector(CandidateX, CandidateY, CandidateZ);
|
||||
BestIslandIndex = IslandIndex;
|
||||
}
|
||||
|
||||
if (BestIslandIndex == INDEX_NONE || BestDistSq > MaxSnapSq || BestPoint.ContainsNaN())
|
||||
{
|
||||
return false;
|
||||
}
|
||||
|
||||
OutPoint = BestPoint;
|
||||
return FMath::IsFinite(OutPoint.X) && FMath::IsFinite(OutPoint.Y)
|
||||
&& FMath::IsFinite(OutPoint.Z);
|
||||
}
|
||||
}
|
||||
|
||||
bool VF_SuggestOpenPointZ(
|
||||
bool VF_SuggestLandingPoint(
|
||||
ECaveGeneratorType Archetype,
|
||||
const FStrateGenerationParams& CaveParams,
|
||||
const FSlabGenerationParams& SlabParams,
|
||||
int32 Seed,
|
||||
float StrateTopZ,
|
||||
float StrateBottomZ,
|
||||
float WorldX,
|
||||
float WorldY,
|
||||
float& OutZ)
|
||||
float DesiredX,
|
||||
float DesiredY,
|
||||
float MaxLateralSnap,
|
||||
FVector& OutPoint)
|
||||
{
|
||||
switch (Archetype)
|
||||
{
|
||||
case ECaveGeneratorType::TunnelNetwork:
|
||||
case ECaveGeneratorType::Underwater:
|
||||
return VF_FindNearestHashRoomZ(CaveParams, Seed, StrateTopZ, StrateBottomZ,
|
||||
WorldX, WorldY, OutZ);
|
||||
return VF_FindNearestHashRoomLandingPoint(CaveParams, Seed, StrateTopZ, StrateBottomZ,
|
||||
DesiredX, DesiredY, MaxLateralSnap, OutPoint);
|
||||
|
||||
case ECaveGeneratorType::FlatPlain:
|
||||
case ECaveGeneratorType::CrystalChamber:
|
||||
return VF_SuggestSlabOpenPointZ(SlabParams, Seed, StrateTopZ, StrateBottomZ,
|
||||
WorldX, WorldY, OutZ);
|
||||
return VF_SuggestSlabLandingPoint(SlabParams, Seed, StrateTopZ, StrateBottomZ,
|
||||
DesiredX, DesiredY, MaxLateralSnap, OutPoint);
|
||||
|
||||
default:
|
||||
// This overload intentionally covers only archetypes whose placement parameters are
|
||||
// already present in the two legacy structs. The complete overload below carries the
|
||||
// lattice/grid/blob parameters and answers those sources without guessing.
|
||||
return false;
|
||||
}
|
||||
}
|
||||
|
||||
bool VF_SuggestLandingPoint(
|
||||
ECaveGeneratorType Archetype,
|
||||
const FStrateGenerationParams& CaveParams,
|
||||
const FSlabGenerationParams& SlabParams,
|
||||
const FMazeGenerationParams& MazeParams,
|
||||
const FVerticalShaftParams& VerticalShaftParams,
|
||||
const FFloatingIslandParams& FloatingIslandParams,
|
||||
int32 Seed,
|
||||
float StrateTopZ,
|
||||
float StrateBottomZ,
|
||||
float DesiredX,
|
||||
float DesiredY,
|
||||
float MaxLateralSnap,
|
||||
FVector& OutPoint)
|
||||
{
|
||||
switch (Archetype)
|
||||
{
|
||||
case ECaveGeneratorType::TunnelNetwork:
|
||||
case ECaveGeneratorType::Underwater:
|
||||
return VF_FindNearestHashRoomLandingPoint(CaveParams, Seed, StrateTopZ, StrateBottomZ,
|
||||
DesiredX, DesiredY, MaxLateralSnap, OutPoint);
|
||||
|
||||
case ECaveGeneratorType::FlatPlain:
|
||||
case ECaveGeneratorType::CrystalChamber:
|
||||
return VF_SuggestSlabLandingPoint(SlabParams, Seed, StrateTopZ, StrateBottomZ,
|
||||
DesiredX, DesiredY, MaxLateralSnap, OutPoint);
|
||||
|
||||
case ECaveGeneratorType::Maze:
|
||||
return VF_SuggestMazeLandingPoint(MazeParams, Seed, StrateTopZ, StrateBottomZ,
|
||||
DesiredX, DesiredY, MaxLateralSnap, OutPoint);
|
||||
|
||||
case ECaveGeneratorType::VerticalShafts:
|
||||
return VF_SuggestVerticalShaftLandingPoint(VerticalShaftParams, Seed,
|
||||
StrateTopZ, StrateBottomZ,
|
||||
DesiredX, DesiredY, MaxLateralSnap, OutPoint);
|
||||
|
||||
case ECaveGeneratorType::FloatingIslands:
|
||||
return VF_SuggestFloatingIslandLandingPoint(FloatingIslandParams, Seed,
|
||||
StrateTopZ, StrateBottomZ,
|
||||
DesiredX, DesiredY, MaxLateralSnap, OutPoint);
|
||||
|
||||
case ECaveGeneratorType::SurfaceWorld:
|
||||
// The structural heightfield is analytically seed-based, but production SurfaceWorld
|
||||
// resolves biome-selected surface params and per-column overhang state through the
|
||||
// manager/cache path. This pure API has no biome context and must not query it.
|
||||
return false;
|
||||
|
||||
default:
|
||||
// No confident source-level answer for Maze, SurfaceWorld, shafts, or islands yet.
|
||||
// Pas de réponse source sûre pour Maze, SurfaceWorld, shafts ou islands pour le moment.
|
||||
return false;
|
||||
}
|
||||
}
|
||||
@@ -476,7 +1227,7 @@ void VoxelCaveMorphology::BuildChunkCache(
|
||||
//=========================================================================
|
||||
// Vertical range for room CENTER placement.
|
||||
// PLACEMENT CONTRACT: this formula MUST remain identical to
|
||||
// VF_FindNearestHashRoomZ above. The pure landing query deliberately does not call this
|
||||
// VF_FindNearestHashRoomLandingPoint above. The pure landing query deliberately does not call this
|
||||
// per-chunk cache builder during Initialize, so the fixed
|
||||
// VoxelForge.Determinism.PassageLandsInOpenSpace ring test is the guard that catches drift
|
||||
// between the two sites.
|
||||
|
||||
Reference in new issue
Block a user