lygia/sdf/tetrahedronSDF)generate the SDF of a tetrahedron
Use:
<float> tetrahedronSDF( in <vec3> pos, in <float> h )
#ifndef FNC_TETRAHEDRONSDF
#define FNC_TETRAHEDRONSDF
float tetrahedronSDF(vec3 p, float h) {
vec3 q = abs(p);
float y = p.y;
float d1 = q.z-max(0.,y);
float d2 = max(q.x*.5 + y*.5,.0) - min(h, h+y);
return length(max(vec2(d1,d2),.005)) + min(max(d1,d2), 0.0);
}
#endif
Use:
<float> tetrahedronSDF( in <float3> pos, in <float> h )
#ifndef FNC_TETRAHEDRONSDF
#define FNC_TETRAHEDRONSDF
float tetrahedronSDF(float3 p, float h) {
float3 q = abs(p);
float y = p.y;
float d1 = q.z-max(0.,y);
float d2 = max(q.x*.5 + y*.5,.0) - min(h, h+y);
return length(max(float2(d1,d2),.005)) + min(max(d1,d2), 0.0);
}
#endif
Use:
<float> tetrahedronSDF( <float3> pos, <float> h )
#ifndef FNC_TETRAHEDRONSDF
#define FNC_TETRAHEDRONSDF
float tetrahedronSDF(float3 p, float h) {
float3 q = abs(p);
float y = p.y;
float d1 = q.z-max(0.,y);
float d2 = max(q.x*.5 + y*.5,.0) - min(h, h+y);
return length(max(float2(d1,d2),.005)) + min(max(d1,d2), 0.0);
}
#endif
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