GoaLitiuM/FlaxEngine
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

Add option to sample Global SDF from higher cascade

Browse Source
This commit is contained in:
Wojtek Figat
2024-07-19 00:30:06 +02:00
parent 3945e1416b
commit 53ca33f301
4 changed files with 33 additions and 8 deletions
Download Patch File Download Diff File Expand all files Collapse all files

10
Source/Shaders/GlobalSignDistanceField.hlsl
View File

@@ -126,12 +126,13 @@ float SampleGlobalSDF(const GlobalSDFData data, Texture3D<snorm float> tex, floa
}
// Samples the Global SDF and returns the distance to the closest surface (in world units) at the given world location.
float SampleGlobalSDF(const GlobalSDFData data, Texture3D<snorm float> tex, Texture3D<snorm float> mip, float3 worldPosition)
float SampleGlobalSDF(const GlobalSDFData data, Texture3D<snorm float> tex, Texture3D<snorm float> mip, float3 worldPosition, uint startCascade = 0)
{
float distance = data.CascadePosDistance[3].w * 2.0f;
if (distance <= 0.0f)
return GLOBAL_SDF_WORLD_SIZE;
for (uint cascade = 0; cascade < data.CascadesCount; cascade++)
startCascade = min(startCascade, data.CascadesCount - 1);
for (uint cascade = startCascade; cascade < data.CascadesCount; cascade++)
{
float3 cascadeUV, textureUV;
GetGlobalSDFCascadeUV(data, cascade, worldPosition, cascadeUV, textureUV);
@@ -186,13 +187,14 @@ float3 SampleGlobalSDFGradient(const GlobalSDFData data, Texture3D<snorm float>
}
// Samples the Global SDF and returns the gradient vector (derivative) at the given world location. Normalize it to get normal vector.
float3 SampleGlobalSDFGradient(const GlobalSDFData data, Texture3D<snorm float> tex, Texture3D<snorm float> mip, float3 worldPosition, out float distance)
float3 SampleGlobalSDFGradient(const GlobalSDFData data, Texture3D<snorm float> tex, Texture3D<snorm float> mip, float3 worldPosition, out float distance, uint startCascade = 0)
{
float3 gradient = float3(0, 0.00001f, 0);
distance = GLOBAL_SDF_WORLD_SIZE;
if (data.CascadePosDistance[3].w <= 0.0f)
return gradient;
for (uint cascade = 0; cascade < data.CascadesCount; cascade++)
startCascade = min(startCascade, data.CascadesCount - 1);
for (uint cascade = startCascade; cascade < data.CascadesCount; cascade++)
{
float3 cascadeUV, textureUV;
GetGlobalSDFCascadeUV(data, cascade, worldPosition, cascadeUV, textureUV);