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Fix GlobalSDF mip sampling artifacts on edges of distance limit

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This commit is contained in:
Wojtek Figat
2024-06-06 13:46:29 +02:00
parent a232dac196
commit bc01e6369e
1 changed files with 7 additions and 8 deletions
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15
Source/Shaders/GlobalSignDistanceField.hlsl
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@@ -8,6 +8,7 @@
#define GLOBAL_SDF_MIP_FLOODS 5
#define GLOBAL_SDF_WORLD_SIZE 60000.0f
#define GLOBAL_SDF_MIN_VALID 0.9f
#define GLOBAL_SDF_CHUNK_MARGIN_SCALE 4.0f
// Global SDF data for a constant buffer
struct GlobalSDFData
@@ -124,7 +125,7 @@ float SampleGlobalSDF(const GlobalSDFData data, Texture3D<float> tex, Texture3D<
if (distance <= 0.0f)
return GLOBAL_SDF_WORLD_SIZE;
float chunkSizeDistance = (float)GLOBAL_SDF_RASTERIZE_CHUNK_SIZE / data.Resolution; // Size of the chunk in SDF distance (0-1)
float chunkMarginDistance = (float)GLOBAL_SDF_RASTERIZE_CHUNK_MARGIN / data.Resolution; // Size of the chunk margin in SDF distance (0-1)
float chunkMarginDistance = GLOBAL_SDF_CHUNK_MARGIN_SCALE * (float)GLOBAL_SDF_RASTERIZE_CHUNK_MARGIN / data.Resolution; // Size of the chunk margin in SDF distance (0-1)
for (uint cascade = 0; cascade < data.CascadesCount; cascade++)
{
float cascadeMaxDistance;
@@ -134,7 +135,7 @@ float SampleGlobalSDF(const GlobalSDFData data, Texture3D<float> tex, Texture3D<
if (cascadeDistance < chunkSizeDistance && all(cascadeUV > 0) && all(cascadeUV < 1))
{
float cascadeDistanceTex = tex.SampleLevel(SamplerLinearClamp, textureUV, 0);
if (cascadeDistanceTex < chunkMarginDistance * 2)
if (cascadeDistanceTex < chunkMarginDistance)
cascadeDistance = cascadeDistanceTex;
distance = cascadeDistance * cascadeMaxDistance;
break;
@@ -181,7 +182,7 @@ float3 SampleGlobalSDFGradient(const GlobalSDFData data, Texture3D<float> tex, T
if (data.CascadePosDistance[3].w <= 0.0f)
return gradient;
float chunkSizeDistance = (float)GLOBAL_SDF_RASTERIZE_CHUNK_SIZE / data.Resolution; // Size of the chunk in SDF distance (0-1)
float chunkMarginDistance = (float)GLOBAL_SDF_RASTERIZE_CHUNK_MARGIN / data.Resolution; // Size of the chunk margin in SDF distance (0-1)
float chunkMarginDistance = GLOBAL_SDF_CHUNK_MARGIN_SCALE * (float)GLOBAL_SDF_RASTERIZE_CHUNK_MARGIN / data.Resolution; // Size of the chunk margin in SDF distance (0-1)
for (uint cascade = 0; cascade < data.CascadesCount; cascade++)
{
float cascadeMaxDistance;
@@ -191,7 +192,7 @@ float3 SampleGlobalSDFGradient(const GlobalSDFData data, Texture3D<float> tex, T
if (cascadeDistance < chunkSizeDistance && all(cascadeUV > 0) && all(cascadeUV < 1))
{
float cascadeDistanceTex = tex.SampleLevel(SamplerLinearClamp, textureUV, 0);
if (cascadeDistanceTex < chunkMarginDistance * 2)
if (cascadeDistanceTex < chunkMarginDistance)
cascadeDistance = cascadeDistanceTex;
float texelOffset = 1.0f / data.Resolution;
float xp = tex.SampleLevel(SamplerLinearClamp, float3(textureUV.x + texelOffset, textureUV.y, textureUV.z), 0).x;
@@ -215,7 +216,7 @@ GlobalSDFHit RayTraceGlobalSDF(const GlobalSDFData data, Texture3D<float> tex, T
GlobalSDFHit hit = (GlobalSDFHit)0;
hit.HitTime = -1.0f;
float chunkSizeDistance = (float)GLOBAL_SDF_RASTERIZE_CHUNK_SIZE / data.Resolution; // Size of the chunk in SDF distance (0-1)
float chunkMarginDistance = (float)GLOBAL_SDF_RASTERIZE_CHUNK_MARGIN / data.Resolution; // Size of the chunk margin in SDF distance (0-1)
float chunkMarginDistance = GLOBAL_SDF_CHUNK_MARGIN_SCALE * (float)GLOBAL_SDF_RASTERIZE_CHUNK_MARGIN / data.Resolution; // Size of the chunk margin in SDF distance (0-1)
float nextIntersectionStart = trace.MinDistance;
float traceMaxDistance = min(trace.MaxDistance, data.CascadePosDistance[3].w * 2);
float3 traceEndPosition = trace.WorldPosition + trace.WorldDirection * traceMaxDistance;
@@ -258,10 +259,8 @@ GlobalSDFHit RayTraceGlobalSDF(const GlobalSDFData data, Texture3D<float> tex, T
if (stepDistance < chunkSizeDistance)
{
float stepDistanceTex = tex.SampleLevel(SamplerLinearClamp, textureUV, 0);
if (stepDistanceTex < chunkMarginDistance * 2)
{
if (stepDistanceTex < chunkMarginDistance)
stepDistance = stepDistanceTex;
}
}
else
{