/* virtual */ void
sphere::do_changed(field::base& f)
{
TRACE("hugh::scene::object::geometry::do_changed");
if (&f == &subdivision) {
attribute_list_.clear();
index_list_ .clear();
octahedron const oct;
for (auto const& a : oct.attributes.get()) { // why doesn't '*oct.attributes' work here?
add_point(a.position, attribute_list_);
}
unsigned running_idx(unsigned((*oct.attributes).size()));
for (unsigned i(0); i < (*oct.indices).size(); i += 3) {
subdivide_triangle((*oct.indices)[i+0], (*oct.indices)[i+1], (*oct.indices)[i+2],
*subdivision, attribute_list_, index_list_, running_idx);
}
compute_bounds();
compute_tangents();
}
else {
base::do_changed(f);
}
}
static struct mesh *mesh_subdivide_icosphere(struct mesh *m, int subdivisions)
{
struct mesh *m2;
int i, ntris = m->ntriangles;
if (subdivisions == 0)
return m;
/* Allocate space for the new, bigger mesh */
m2 = allocate_mesh_for_copy(m->ntriangles * 4, m->nvertices + m->ntriangles * 3, 0, 0);
if (!m2)
return NULL;
copy_mesh_contents(m2, m);
mesh_free(m);
for (i = 0; i < ntris; i++)
subdivide_triangle(m2, i);
normalize_sphere(m2);
mesh_set_spherical_vertex_normals(m2);
return mesh_subdivide_icosphere(m2, subdivisions - 1);
}
