/* generates geodesic sphere: if hemi is true we only gen the hemisphere */
void gen_geosphere(Mesh *mesh, float rad, int subdiv, bool hemi = false);
void gen_heightfield(Mesh *mesh, float xsz, float ysz, float height, int usub,
/* generates geodesic sphere: if hemi is true we only gen the hemisphere */
void gen_geosphere(Mesh *mesh, float rad, int subdiv, bool hemi = false);
void gen_heightfield(Mesh *mesh, float xsz, float ysz, float height, int usub,