2 This file is part of the graphics core library.
4 Copyright (c) 2004, 2005 John Tsiombikas <nuclear@siggraph.org>
6 the graphics core library is free software; you can redistribute it and/or modify
7 it under the terms of the GNU General Public License as published by
8 the Free Software Foundation; either version 2 of the License, or
9 (at your option) any later version.
11 the graphics core library is distributed in the hope that it will be useful,
12 but WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 GNU General Public License for more details.
16 You should have received a copy of the GNU General Public License
17 along with the graphics core library; if not, write to the Free Software
18 Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
23 * Author: John Tsiombikas 2005
28 BoundingVolume::BoundingVolume() {
32 BoundingVolume::~BoundingVolume() {}
34 void BoundingVolume::set_transform(const Matrix4x4 &transform) {
35 this->transform = transform;
38 BoundingSphere::BoundingSphere(const Vector3 &pos, scalar_t rad) {
43 bool BoundingSphere::ray_hit(const Ray &ray) const {
45 Vector3 new_pos = sph.get_position();
46 sph.set_position(new_pos.transformed(transform));
48 if(!sph.check_intersection(ray)) return false;
49 if(!children.size()) return true;
51 for(size_t i=0; i<children.size(); i++) {
52 if(children[i]->ray_hit(ray)) return true;
58 bool BoundingSphere::visible(const FrustumPlane *frustum) const {
59 Vector3 new_pos = pos.transformed(transform);
61 for(int i=0; i<6; i++) {
62 Vector3 normal(frustum[i].a, frustum[i].b, frustum[i].c);
63 scalar_t dist = dot_product(new_pos, normal) + frustum[i].d;
65 if(fabs(dist) < radius) break;
66 if(dist < -radius) return false;
69 // the sphere is at least partially inside the frustum, check any children
70 if(!children.size()) return true;
72 for(size_t i=0; i<children.size(); i++) {
73 if(children[i]->visible(frustum)) return true;