// Combines specular lighting and diffuse lighting with subsurface scattering.
void CombineSubsurfaceScattering(HDCamera hdCamera, ScriptableRenderContext context, SubsurfaceScatteringParameters sssParameters)
{
// Currently, forward-rendered objects do not output split lighting required for the SSS pass.
if (debugParameters.ShouldUseForwardRenderingOnly())
{
return;
}
// Assume that the height of the projection window is 2 meters.
float distanceToProjectionWindow = 1.0f / Mathf.Tan(0.5f * Mathf.Deg2Rad * hdCamera.camera.fieldOfView);
m_CombineSubsurfaceScattering.SetFloat("_DistToProjWindow", distanceToProjectionWindow);
m_CombineSubsurfaceScattering.SetFloat("_BilateralScale", 0.05f * sssParameters.bilateralScale);
// TODO: use user-defined values for '_ProfileID' and '_FilterRadius.'
m_CombineSubsurfaceScattering.SetVectorArray("_FilterKernel", sssParameters.profiles[0].filterKernel);
m_CombineSubsurfaceScattering.SetFloat("_FilterRadius", 3.0f);
MaterialPropertyBlock properties = new MaterialPropertyBlock();
var cmd = new CommandBuffer()
{
name = "Combine Subsurface Scattering"
};
// Perform the vertical SSS filtering pass.
properties.SetFloat("_DstBlend", (float)BlendMode.Zero); // TODO: this doesn't work for some reason...
properties.SetFloat("_FilterHorizontal", 0);
cmd.SetGlobalTexture("_IrradianceSource", m_CameraSubsurfaceBufferRT);
Utilities.DrawFullscreen(cmd, m_CombineSubsurfaceScattering, hdCamera,
m_CameraFilteringBufferRT, m_CameraStencilBufferRT, properties);
// Perform the horizontal SSS filtering pass, and combine diffuse and specular lighting.
properties.SetFloat("_DstBlend", (float)BlendMode.One); // TODO: this doesn't work for some reason...
properties.SetFloat("_FilterHorizontal", 1);
cmd.SetGlobalTexture("_IrradianceSource", m_CameraFilteringBufferRT);
Utilities.DrawFullscreen(cmd, m_CombineSubsurfaceScattering, hdCamera,
m_CameraColorBufferRT, m_CameraStencilBufferRT, properties);
context.ExecuteCommandBuffer(cmd);
cmd.Dispose();
}
