Jamie Greunbaum
8eaef49f2e
- Moved video screen into its own separate movie tent. - Adjusted stable post-processing volume. - Chickens are now at full volume. - Added button to toggle chickens off and on.
56 lines
1.6 KiB
HLSL
56 lines
1.6 KiB
HLSL
#ifndef SERVICE_NORMALSHADOW_INCLUDED
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#define SERVICE_NORMALSHADOW_INCLUDED
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// Ref: Normal Mapping Shadows by Boris Vorontsov
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// Please define a NormalMapShadowsParam parameter
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// and SampleNormalMap function to sample the normal map.
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float NormalMapShadows (float3 lightDirTangent, NormalMapShadowsParam nmsParam, float noise,
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float heightScale, float shadowHardness)
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{
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const float screenShadowSamples = 20;
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const float hardness = heightScale * shadowHardness;
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const float sampleStep = 1.0 / screenShadowSamples;
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float2 dir = lightDirTangent.xy * heightScale;
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// Redundancy can't be helped
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float3 normal = SampleNormalMap(nmsParam, 0);
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lightDirTangent = normalize(lightDirTangent);
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float tangentNdotL = saturate(dot(lightDirTangent, normal));
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float currentSample = sampleStep - sampleStep * noise;
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// Skip on backfaces
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currentSample += (tangentNdotL <= 0.0);
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/*
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From the PDF:
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Trace from hit point to light direction and compute sum of dot products
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between normal map and light direction.
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If slope is bigger than 0, pixel is shadowed. If slope is also bigger
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than previous maximal value, increase hardness of shadow.
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*/
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float result = 0;
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float slope = -tangentNdotL;
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float maxslope = 0.0;
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while (currentSample <= 1.0)
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{
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normal = SampleNormalMap(nmsParam, dir * currentSample);
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tangentNdotL = dot(lightDirTangent, normal);
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slope = slope - tangentNdotL;
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if (slope > maxslope)
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{
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result += hardness * (1.0-currentSample);
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}
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maxslope = max(maxslope, slope);
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currentSample += sampleStep;
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}
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return result * sampleStep;
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}
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#endif // SERVICE_NORMALSHADOW_INCLUDED |