d61d2f19ed
Removed redundant code from raymarching implementation Moved last remaining raymarching variable (Extinction) to environment settings
31 lines
1 KiB
HLSL
31 lines
1 KiB
HLSL
#pragma once
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#include "./CloudShaderHelper.cginc"
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float GetDensity(float3 startPos, float3 dir, float maxSampleDistance, float raymarchOffset, out float3 intensity,out float depth) {
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float raymarchDistance = 0;
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RaymarchStatus result;
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InitRaymarchStatus(result);
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[loop]
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for (int j = 0; j < SAMPLE_COUNT; j++) {
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float prevRayDist = raymarchDistance;
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raymarchDistance = pow((j+raymarchOffset)/SAMPLE_COUNT,2) * _ProjectionParams.z;
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if(raymarchDistance > maxSampleDistance) break;
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float step = raymarchDistance - prevRayDist;
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float3 rayPos = startPos + dir * raymarchDistance;
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float fade = smoothstep(_ProjectionParams.z*.95,_ProjectionParams.z, raymarchDistance);
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IntegrateRaymarch(startPos, rayPos, fade, step, result);
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if (result.intTransmittance < 0.01f) {
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result.intTransmittance = 0;
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break;
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}
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}
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depth = result.depth / result.depthweightsum / _ProjectionParams.z;
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if (depth == 0.0f) {
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depth = maxSampleDistance;
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}
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intensity = result.intensity;
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return (1.0f - result.intTransmittance);
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}
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