public DensityVolumeEngineData ConvertToEngineData()
{
DensityVolumeEngineData data = new DensityVolumeEngineData();
data.extinction = VolumeRenderingUtils.ExtinctionFromMeanFreePath(meanFreePath);
data.scattering = VolumeRenderingUtils.ScatteringFromExtinctionAndAlbedo(data.extinction, (Vector3)(Vector4)albedo);
data.textureIndex = textureIndex;
data.textureScroll = volumeScrollingAmount;
data.textureTiling = textureTiling;
// Note that we do not clamp here. Infinities work in the expected way in the shader.
// This also allows us to avoid artifacts caused by numerical issues.
data.rcpPosFade.x = 1.0f / positiveFade.x;
data.rcpPosFade.y = 1.0f / positiveFade.y;
data.rcpPosFade.z = 1.0f / positiveFade.z;
data.rcpNegFade.y = 1.0f / negativeFade.y;
data.rcpNegFade.x = 1.0f / negativeFade.x;
data.rcpNegFade.z = 1.0f / negativeFade.z;
data.invertFade = invertFade ? 1 : 0;
return(data);
}
public DensityVolumeEngineData ConvertToEngineData()
{
DensityVolumeEngineData data = new DensityVolumeEngineData();
data.extinction = VolumeRenderingUtils.ExtinctionFromMeanFreePath(meanFreePath);
data.scattering = VolumeRenderingUtils.ScatteringFromExtinctionAndAlbedo(data.extinction, (Vector3)(Vector4)albedo);
data.textureIndex = textureIndex;
data.textureScroll = volumeScrollingAmount;
data.textureTiling = textureTiling;
// Clamp to avoid NaNs.
Vector3 positiveFade = this.positiveFade;
Vector3 negativeFade = this.negativeFade;
data.rcpPosFade.x = Mathf.Min(1.0f / positiveFade.x, float.MaxValue);
data.rcpPosFade.y = Mathf.Min(1.0f / positiveFade.y, float.MaxValue);
data.rcpPosFade.z = Mathf.Min(1.0f / positiveFade.z, float.MaxValue);
data.rcpNegFade.y = Mathf.Min(1.0f / negativeFade.y, float.MaxValue);
data.rcpNegFade.x = Mathf.Min(1.0f / negativeFade.x, float.MaxValue);
data.rcpNegFade.z = Mathf.Min(1.0f / negativeFade.z, float.MaxValue);
data.invertFade = invertFade ? 1 : 0;
return(data);
}
public override void PushShaderParameters(HDCamera hdCamera, CommandBuffer cmd)
{
PushShaderParametersCommon(hdCamera, cmd, FogType.Volumetric);
DensityVolumeArtistParameters param = new DensityVolumeArtistParameters(albedo, meanFreePath, anisotropy);
DensityVolumeEngineData data = param.ConvertToEngineData();
cmd.SetGlobalVector(HDShaderIDs._HeightFogBaseScattering, data.scattering);
cmd.SetGlobalFloat(HDShaderIDs._HeightFogBaseExtinction, data.extinction);
float crBaseHeight = baseHeight;
if (ShaderConfig.s_CameraRelativeRendering != 0)
{
crBaseHeight -= hdCamera.camera.transform.position.y;
}
float relativeMeanHeight = Mathf.Max(0.01f, meanHeight - baseHeight);
// FogExponent = 1 / BaseRelative(MeanHeight)
cmd.SetGlobalVector(HDShaderIDs._HeightFogExponents, new Vector2(1.0f / relativeMeanHeight, relativeMeanHeight));
cmd.SetGlobalFloat(HDShaderIDs._HeightFogBaseHeight, crBaseHeight);
cmd.SetGlobalFloat(HDShaderIDs._GlobalFogAnisotropy, anisotropy);
cmd.SetGlobalInt(HDShaderIDs._EnableDistantFog, enableDistantFog ? 1 : 0);
}
public override void PushShaderParameters(HDCamera hdCamera, CommandBuffer cmd)
{
DensityVolumeArtistParameters param = new DensityVolumeArtistParameters(albedo, meanFreePath, anisotropy);
DensityVolumeEngineData data = param.ConvertToEngineData();
cmd.SetGlobalInt(HDShaderIDs._AtmosphericScatteringType, (int)FogType.Volumetric);
cmd.SetGlobalVector(HDShaderIDs._GlobalScattering, data.scattering);
cmd.SetGlobalFloat(HDShaderIDs._GlobalExtinction, data.extinction);
cmd.SetGlobalFloat(HDShaderIDs._GlobalAnisotropy, anisotropy);
}
public static void PushNeutralShaderParameters(HDCamera hdCamera, CommandBuffer cmd)
{
cmd.SetGlobalInt(HDShaderIDs._AtmosphericScatteringType, (int)FogType.None);
// In case volumetric lighting is enabled, we need to make sure that all rendering passes
// (not just the atmospheric scattering one) receive neutral parameters.
if (hdCamera.frameSettings.enableVolumetrics)
{
var data = DensityVolumeEngineData.GetNeutralValues();
cmd.SetGlobalVector(HDShaderIDs._GlobalScattering, data.scattering);
cmd.SetGlobalFloat(HDShaderIDs._GlobalExtinction, data.extinction);
cmd.SetGlobalFloat(HDShaderIDs._GlobalAnisotropy, 0.0f);
}
}
public DensityVolumeEngineData GetData()
{
DensityVolumeEngineData data = new DensityVolumeEngineData();
data.extinction = VolumeRenderingUtils.ExtinctionFromMeanFreePath(meanFreePath);
data.scattering = VolumeRenderingUtils.ScatteringFromExtinctionAndAlbedo(data.extinction, (Vector3)(Vector4)albedo);
data.textureIndex = textureIndex;
data.textureScroll = volumeScrollingAmount;
data.textureTiling = textureTiling;
// Avoid numerical problems by clamping extreme values.
data.rcpPosFade.x = Mathf.Clamp(1.0f / positiveFade.x, 0.00001526f, 65536.0f);
data.rcpNegFade.x = Mathf.Clamp(1.0f / negativeFade.x, 0.00001526f, 65536.0f);
data.rcpPosFade.y = Mathf.Clamp(1.0f / positiveFade.y, 0.00001526f, 65536.0f);
data.rcpNegFade.y = Mathf.Clamp(1.0f / negativeFade.y, 0.00001526f, 65536.0f);
data.rcpPosFade.z = Mathf.Clamp(1.0f / positiveFade.z, 0.00001526f, 65536.0f);
data.rcpNegFade.z = Mathf.Clamp(1.0f / negativeFade.z, 0.00001526f, 65536.0f);
return(data);
}
public override void PushShaderParameters(HDCamera hdCamera, CommandBuffer cmd)
{
DensityVolumeArtistParameters param = new DensityVolumeArtistParameters(albedo, meanFreePath, anisotropy);
DensityVolumeEngineData data = param.ConvertToEngineData();
cmd.SetGlobalInt(HDShaderIDs._AtmosphericScatteringType, (int)FogType.Volumetric);
cmd.SetGlobalVector(HDShaderIDs._HeightFogBaseScattering, data.scattering);
cmd.SetGlobalFloat(HDShaderIDs._HeightFogBaseExtinction, data.extinction);
float crBaseHeight = baseHeight;
if (ShaderConfig.s_CameraRelativeRendering != 0)
{
crBaseHeight -= hdCamera.camera.transform.position.y;
}
cmd.SetGlobalVector(HDShaderIDs._HeightFogExponents, new Vector2(heightExponent, 1.0f / heightExponent));
cmd.SetGlobalFloat(HDShaderIDs._HeightFogBaseHeight, crBaseHeight);
cmd.SetGlobalFloat(HDShaderIDs._GlobalFogAnisotropy, anisotropy);
}
