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Path Tracer: Take the normal map into account at the exit point of the random walk for better detail preservation in SSS

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#rb TianTian.Xie
#preflight 62759517f27a22404d1fb373

[CL 20085984 by chris kulla in ue5-main branch]
This commit is contained in:
chris kulla
2022-05-06 17:45:06 -04:00
parent 5546a1d6d8
commit fe0131977b
1 changed files with 4 additions and 2 deletions
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6
Engine/Shaders/Private/PathTracing/PathTracingCore.ush
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@@ -439,6 +439,7 @@ struct FProbeResult
{
float HitT;
float3 WorldNormal;
float3 WorldSmoothNormal;
float3 WorldGeoNormal;
int FrontFace;
@@ -470,7 +471,8 @@ FProbeResult TraceProbeRay(RayDesc Ray, uint2 PixelCoord)
FPathTracingPayload Payload = UnpackPathTracingPayload(PackedPayload, Ray);
FProbeResult Result;
Result.HitT = PackedPayload.HitT;
Result.WorldNormal = Payload.WorldSmoothNormal;
Result.WorldNormal = Payload.WorldNormal;
Result.WorldSmoothNormal = Payload.WorldSmoothNormal;
Result.WorldGeoNormal = Payload.WorldGeoNormal;
Result.FrontFace = Payload.IsFrontFace();
return Result;
@@ -654,7 +656,7 @@ bool ProcessSubsurfaceRandomWalk(inout FPathTracingPayload Payload, inout float3
// we hit the boundary! overwrite the current payload and exit the walk with a diffuse scattering event
Payload.TranslatedWorldPos = Ray.Origin + ProbeResult.HitT * Ray.Direction;
Payload.WorldNormal = ProbeResult.WorldNormal;
Payload.WorldSmoothNormal = ProbeResult.WorldNormal;
Payload.WorldSmoothNormal = ProbeResult.WorldSmoothNormal;
Payload.WorldGeoNormal = ProbeResult.WorldGeoNormal;
// make sure normal is pointed outward from the object so we capture illumination from the exterior
if (ProbeResult.FrontFace != Payload.IsFrontFace())