lygia/sdf/ellipsoidSDF)generate the SDF of an approximated ellipsoid
Use:
<float> ellipsoidSDF( in <vec3> p, in <vec3> r )
#ifndef FNC_ELLIPSOIDSDF
#define FNC_ELLIPSOIDSDF
float ellipsoidSDF( in vec3 p, in vec3 r ) {
float k0 = length(p/r);
float k1 = length(p/(r*r));
return k0*(k0-1.0)/k1;
}
#endif
Use:
<float> ellipsoidSDF( in <float3> p, in <float3> r )
#ifndef FNC_ELLIPSOIDSDF
#define FNC_ELLIPSOIDSDF
float ellipsoidSDF( in float3 p, in float3 r ) {
float k0 = length(p/r);
float k1 = length(p/(r*r));
return k0*(k0-1.0)/k1;
}
#endif
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