Morph a sphere to a cube and a cube to a sphere with GLSL
- by nkint
I'm getting started with GLSL with quartz composer.
I have a patch with a particle system in which each particle is mapped into a sphere with a blend value. With blend=0 particles are in random positions, blend=1 particles are in the sphere. The code is here:
vec3 sphere(vec2 domain)
{
vec3 range;
range.x = radius * cos(domain.y) * sin(domain.x);
range.y = radius * sin(domain.y) * sin(domain.x);
range.z = radius * cos(domain.x);
return range;
}
// in main:
vec2 p0 = gl_Vertex.xy * twopi;
vec3 normal = sphere(p0);;
vec3 r0 = radius * normal;
vec3 vertex = r0;
normal = normal * blend + gl_Normal * (1.0 - blend);
vertex = vertex * blend + gl_Vertex.xyz * (1.0 - blend);
I'd like the particle to be on a cube if blend=0
I've tried to find but I can't figure out some parametric equation for the cube.
Maybe it is not the right way?
