16 lines
No EOL
348 B
HLSL
16 lines
No EOL
348 B
HLSL
/*
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contributors: Inigo Quiles
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description: generate the SDF of an approximated ellipsoid
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use: <float> ellipsoidSDF( in <float3> p, in <float3> r )
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*/
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#ifndef FNC_ELLIPSOIDSDF
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#define FNC_ELLIPSOIDSDF
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float ellipsoidSDF( in float3 p, in float3 r ) {
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float k0 = length(p/r);
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float k1 = length(p/(r*r));
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return k0*(k0-1.0)/k1;
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}
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#endif |