Decocube

decocube.glsl

// example for an implicit surface that is not lipschitz continuous
float decocube(vec3 p) {
    float r = (0.8*0.8);
    float a = ((p.x+p.y)-r);
    float b = ((p.y+p.z)-r);
    float c = ((p.z+p.x)-r);
    vec3 u = (p-1.0);
    float q = ((a*a)+(u.z*u.z));
    float s = ((b*b)+(u.x*u.x));
    float t = ((c*c)+(u.y*u.y));
    return ((q*s*t)-0.04);
}