void Geometry::update_bounding_volume() const {
const mat4& model_m = SceneObject::get_local_to_world();
//TODO: we should use OBB in here...
//at the moment we use bounding spheres only
//Note that the (non-uniform) scale operation would invalidate
//the bounding sphere as well, at the moment
const Sphere& sphere = _mesh->bounding_volume().sphere();
vec4 center = vec4(sphere.center(), 1);
vec4 ctr_m = model_m * center;
//Note: this works only with uniform scale operations!
//Transform a point on sphere to get the new radius
vec4 p = center;
p.z += sphere.radius();
vec4 p_m = model_m * p;
vec4 diff = (p_m - ctr_m);
float new_radius = glm::length(diff);
Sphere s_m(new_radius, vec3(ctr_m));
_bounding_volume = BoundingVolume(s_m);
}
void rPrimitiveSphere::RecalculateBoundingVolume(){
rSphere s(0, m_radius, 0, m_radius);
rSphereBoundingVolume* boundingVolume = (rSphereBoundingVolume*)BoundingVolume();
boundingVolume->SetSphere(s);
}
BoundingVolume BoundingVolume::sphere(Size radius) {
return BoundingVolume(radius);
}
BoundingVolume BoundingVolume::capsule(Size radius, Size height) {
return BoundingVolume(radius, height);
}
BoundingVolume BoundingVolume::box(const Dimension &dimensions) {
return BoundingVolume(dimensions);
}
