std::pair<bool, Real>
doPicking(const Ogre::Ray& localRay, const CollisionModel& collisionModel, CullingMode cullingMode)
{
// Convert our ray to Opcode ray
IceMaths::Ray world_ray(
IceMaths::Point(localRay.getOrigin().x, localRay.getOrigin().y, localRay.getOrigin().z),
IceMaths::Point(localRay.getDirection().x, localRay.getDirection().y, localRay.getDirection().z));
// Be aware we store triangle as ccw in collision mode, and Opcode treat it as cw,
// so need to inverse cull mode here.
Opcode::CullMode cullMode;
switch (cullingMode)
{
default:
case CULL_NONE:
cullMode = Opcode::CULLMODE_NONE;
break;
case CULL_CLOCKWISE:
cullMode = Opcode::CULLMODE_CCW;
break;
case CULL_ANTICLOCKWISE:
cullMode = Opcode::CULLMODE_CW;
break;
}
// Cull mode callback for Opcode
struct Local
{
static Opcode::CullMode cullModeCallback(udword triangle_index, void* user_data)
{
return (Opcode::CullMode) (int) user_data;
}
};
std::pair<bool, Real> ret;
// Do picking
Opcode::CollisionFace picked_face;
ret.first = Opcode::Picking(picked_face,
world_ray, collisionModel.getOpcodeModel(), 0,
0, FLT_MAX,
world_ray.mOrig,
&Local::cullModeCallback, (void*) (int) cullMode);
ret.second = ret.first ? picked_face.mDistance : 0;
return ret;
}
void PLodNode::ray_test_impl(Ray const& ray,
int options,
Mask const& mask,
std::set<PickResult>& hits) {
// first of all, check bbox
auto box_hits(::gua::intersect(ray, bounding_box_));
// ray did not intersect bbox -- therefore it wont intersect
if (box_hits.first == Ray::END && box_hits.second == Ray::END) {
return;
}
// return if only first object shall be returned and the current first hit
// is in front of the bbox entry point and the ray does not start inside
// the bbox
if (options & PickResult::PICK_ONLY_FIRST_OBJECT && hits.size() > 0 &&
hits.begin()->distance < box_hits.first && box_hits.first != Ray::END) {
return;
}
// bbox is intersected, but check geometry only if mask tells us to check
if (get_geometry_description() != "" && mask.check(get_tags())) {
auto geometry(
GeometryDatabase::instance()->lookup(get_geometry_description()));
if (geometry) {
Ray world_ray(ray);
geometry->ray_test(world_ray, options, this, hits);
}
}
for (auto child : get_children()) {
child->ray_test_impl(ray, options, mask, hits);
}
}
