37 lines
1.2 KiB
HLSL
37 lines
1.2 KiB
HLSL
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float _FurLength;
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float _FurGravityStrength;
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[instance(4)]
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[maxvertexcount(16)]
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void geomFur(triangle v2f IN[3], inout TriangleStream < v2f > tristream, uint InstanceID : SV_GSInstanceID)
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{
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float4 fur_worldPos[3];
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v2f o_fur[3];
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float3 offset = (float3(0, -1, 0) * (_FurLength) *_FurGravityStrength);
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for (int i = 0; i < 3; i++)
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{
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if (InstanceID == 0) {
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IN[i].furAlpha = 0;
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tristream.Append(IN[i]);
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}
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o_fur[i] = IN[i];
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fur_worldPos[i] = float4(IN[i].worldPos + IN[i].normal * _FurLength, 1);
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}
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if (InstanceID == 0) {
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tristream.RestartStrip();
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}
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int Total_FurLayers = clamp(floor(_FurLayers * (1 - smoothstep(_FurMinDistance, _FurMaxDistance, distance(IN[0].worldPos, getCameraPosition())))), min(1, _FurLayers), _FurLayers);
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int startLayer = max(int(InstanceID) * 6 - 1, 0);
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for (int layer = startLayer; layer < Total_FurLayers; layer++) {
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for (int i = 0; i < 3; i++) {
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o_fur[i].furAlpha = float(layer+1) / (Total_FurLayers+1);
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o_fur[i].worldPos = float4(lerp(IN[i].worldPos, fur_worldPos[i] + offset * o_fur[i].furAlpha, o_fur[i].furAlpha),1);
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o_fur[i].pos = UnityWorldToClipPos(o_fur[i].worldPos);
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o_fur[i].furAlpha += .01;
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tristream.Append(o_fur[i]);
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}
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tristream.RestartStrip();
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}
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}
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