33 lines
810 B
HLSL
33 lines
810 B
HLSL
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#include "/Math.cginc"
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struct Crater {
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float3 centre;
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float radius;
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float floor;
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float smoothness;
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};
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// Crater data and settings
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StructuredBuffer<Crater> craters;
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int numCraters;
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float floorHeight;
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float rimSteepness;
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float rimWidth;
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float smoothFactor;
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float calculateCraterDepth(float3 vertexPos) {
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float craterHeight = 0;
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for (int i = 0; i < numCraters; i ++) {
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float x = length(vertexPos - craters[i].centre) / max(craters[i].radius, 0.0001);
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float cavity = x * x - 1;
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float rimX = min(x - 1 - rimWidth, 0);
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float rim = rimSteepness * rimX * rimX;
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float craterShape = smoothMax(cavity, craters[i].floor, craters[i].smoothness);
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craterShape = smoothMin(craterShape, rim, craters[i].smoothness);
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craterHeight += craterShape * craters[i].radius;
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}
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return craterHeight;
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}
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