const Drawable *Scene::Intersect(const Ray &ray)
{
bool hit = false;
Vector3d closestPos = 0;
Drawable *closest = NULL;
for (std::vector<Drawable *>::const_iterator i = m_DrawableList.begin(); i != m_DrawableList.end(); i++) {
Drawable *d = *i;
Vector3d pos;
Vector3d normal;
if (d->Intersect(ray, pos, normal)) {
// std::cout << "collision ray " << ray << " pos " << pos << std::endl;
if (!hit || (pos - ray.origin).LengthSquared() < (closestPos - ray.origin).LengthSquared()) {
closestPos = pos;
closest = d;
}
hit = true;
}
}
if (hit)
return closest;
return NULL;
}
bool Scene::DoesIntersect(const Ray &ray)
{
for (std::vector<Drawable *>::const_iterator i = m_DrawableList.begin(); i != m_DrawableList.end(); i++) {
Drawable *d = *i;
if (d->Intersect(ray)) {
return true;
}
}
return false;
}
bool Scene::DoesIntersect(const Ray &ray, double maxDistance)
{
for (std::vector<Drawable *>::const_iterator i = m_DrawableList.begin(); i != m_DrawableList.end(); i++) {
Drawable *d = *i;
Vector3d pos;
Vector3d normal;
if (d->Intersect(ray, pos, normal)) {
if ((ray.origin - pos).Length() < maxDistance)
return true;
}
}
return false;
}