17 lines
No EOL
437 B
GLSL
17 lines
No EOL
437 B
GLSL
/*
|
|
contributors: Inigo Quiles
|
|
description: 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 |