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67 行
2.8 KiB

using System;
using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using UnityEngine.Rendering;
namespace UnityEngine.Experimental.Rendering.HDPipeline
{
public class VolumetricFog : AtmosphericScattering
{
public ColorParameter albedo = new ColorParameter(new Color(0.5f, 0.5f, 0.5f));
public MinFloatParameter meanFreePath = new MinFloatParameter(1000000.0f, 1.0f);
public ClampedFloatParameter asymmetry = new ClampedFloatParameter(0.0f, -1.0f, 1.0f);
// Override the volume blending function.
public override void Override(VolumeComponent state, float interpFactor)
{
VolumetricFog other = state as VolumetricFog;
float thisExtinction = VolumeRenderingUtils.ExtinctionFromMeanFreePath(meanFreePath);
Vector3 thisScattering = VolumeRenderingUtils.ScatteringFromExtinctionAndAlbedo(thisExtinction, (Vector3)(Vector4)albedo.value);
float otherExtinction = VolumeRenderingUtils.ExtinctionFromMeanFreePath(other.meanFreePath);
Vector3 otherScattering = VolumeRenderingUtils.ScatteringFromExtinctionAndAlbedo(otherExtinction, (Vector3)(Vector4)other.albedo.value);
float blendExtinction = Mathf.Lerp(otherExtinction, thisExtinction, interpFactor);
Vector3 blendScattering = Vector3.Lerp(otherScattering, thisScattering, interpFactor);
float blendAsymmetry = Mathf.Lerp(other.asymmetry, asymmetry, interpFactor);
float blendMeanFreePath = VolumeRenderingUtils.MeanFreePathFromExtinction(blendExtinction);
Color blendAlbedo = (Color)(Vector4)VolumeRenderingUtils.AlbedoFromMeanFreePathAndScattering(blendMeanFreePath, blendScattering);
blendAlbedo.a = 1.0f;
if (meanFreePath.overrideState)
{
other.meanFreePath.value = blendMeanFreePath;
}
if (albedo.overrideState)
{
other.albedo.value = blendAlbedo;
}
if (asymmetry.overrideState)
{
other.asymmetry.value = blendAsymmetry;
}
}
public override void PushShaderParameters(CommandBuffer cmd, FrameSettings frameSettings)
{
DensityVolumeParameters param;
param.albedo = albedo;
param.meanFreePath = meanFreePath;
param.asymmetry = asymmetry;
DensityVolumeData data = param.GetData();
cmd.SetGlobalInt(HDShaderIDs._AtmosphericScatteringType, (int)FogType.Volumetric);
cmd.SetGlobalVector(HDShaderIDs._GlobalScattering, data.scattering);
cmd.SetGlobalFloat( HDShaderIDs._GlobalExtinction, data.extinction);
cmd.SetGlobalFloat( HDShaderIDs._GlobalAsymmetry, asymmetry);
}
}
}