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ifsrenderer-linux / Transforms / Umbilic-torus.ifstf

13 lines · ifstf ref: 
@Name: Umbilic torus
@Version: 1.0
@Reference: https://en.wikipedia.org/wiki/Umbilic_torus
@Tags: shape

float u = -PI + TWOPI * random(next);
float v = -PI + TWOPI * random(next);
float a = 7.0 + cos(u/3.0-2.0*v) + 2.0*cos(u/3.0+v);
return vec3(
	sin(u) * a,
	cos(u) * a,
	sin(u/3.0-2.0*v) + 2.0*sin(u/3.0+v));