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Context: - When composing objects into GlobalSDF we shorten the max distance based on the distance to the closest surface found so far - the condition `if (DistanceToBox < MaxDistance)` is incorrect if mesh SDFs stick out of the bounding box - this can cause instability in Global SDF since result will depend on the order objects are composited in - we have logic to prevent this but only when the query position is outside of the bounding box - this is a problem since Global SDF voxel centers can be inside the box Fix: - also prevent negative SDF distance to stick out of the bounding box when query position is inside the box. - Modified how DistanceToBox is calculated to be valid when point is inside box. #rb Krzysztof.Narkowicz #preflight skip [CL 23410499 by tiago costa in ue5-main branch]
37 lines
1.5 KiB
Plaintext
37 lines
1.5 KiB
Plaintext
// Copyright Epic Games, Inc. All Rights Reserved.
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/*=============================================================================
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MeshDistanceFieldCommon.ush
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=============================================================================*/
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float DistanceToNearestSurfaceForObject(FDFObjectData DFObjectData, FLWCVector3 WorldPosition, float MaxDistance)
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{
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const float3 VolumePosition = LWCMultiply(WorldPosition, DFObjectData.WorldToVolume);
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const float3 ClampedVolumePosition = clamp(VolumePosition, -DFObjectData.VolumePositionExtent, DFObjectData.VolumePositionExtent);
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const float3 ToBox = (abs(VolumePosition) - DFObjectData.VolumePositionExtent) * DFObjectData.VolumeToWorldScale;
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const float DistanceToBoxOutside = length(max(0.0f, ToBox));
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const float DistanceToBoxInside = min(0.0f, max3(ToBox.x, ToBox.y, ToBox.z));
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const float DistanceToBox = DistanceToBoxOutside + DistanceToBoxInside;
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float DistanceToOccluder = MaxDistance;
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BRANCH
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if (DistanceToBox < MaxDistance)
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{
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DistanceToOccluder = DistanceToMeshSurfaceStandalone(ClampedVolumePosition, DFObjectData) * DFObjectData.VolumeScale + max(0.0f, DistanceToBox);
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// Don't allow negative SDF distance to stick out of the bounding box
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DistanceToOccluder = max(DistanceToOccluder, DistanceToBox);
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}
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return DistanceToOccluder;
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}
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float DistanceToNearestSurfaceForObject(uint ObjectIndex, FLWCVector3 WorldPosition, float MaxDistance)
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{
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FDFObjectData DFObjectData = LoadDFObjectData(ObjectIndex);
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return DistanceToNearestSurfaceForObject(DFObjectData, WorldPosition, MaxDistance);
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}
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