ifsrenderer-linux / Transforms / Horseshoe.ifstf

@Name: Horseshoe
@Version: 1.0
@Reference: https://flam3.com/flame_draves.pdf
@Tags: 2d

float r = length(p);
return 1.0/r * vec3((p.x-p.y)*(p.x+p.y), 2.0*p.x*p.y, p.z);