+int MetaScene::calc_mirror_planes()
+{
+ int num_mirrors = 0;
+ while(mirrors) {
+ FlatMirror *m = mirrors;
+ mirrors = mirrors->next;
+ delete m;
+ }
+ mirrors = 0;
+ objmirror.clear();
+
+ int numscn = scenes.size();
+ for(int i=0; i<numscn; i++) {
+ Scene *scn = scenes[i];
+
+ int numobj = scn->objects.size();
+ for(int j=0; j<numobj; j++) {
+ Object *obj = scn->objects[j];
+
+ if(obj->mtl.flat_mirror && obj->get_type() == OBJ_MESH) {
+ const Mesh *mesh = ((ObjMesh*)obj)->mesh;
+ if(!mesh) continue;
+
+ FlatMirror *mir = new FlatMirror;
+ mir->reflect = obj->mtl.reflect;
+ mir->node = obj->node;
+
+ if(obj->mtl.flat_mirror == MTL_MIRROR_AUTO) {
+ // grab the first triangle and make a plane
+ Triangle face = Triangle(0, (const Vec3*)mesh->get_attrib_data(MESH_ATTR_VERTEX),
+ mesh->get_index_data());
+ face.calc_normal();
+
+ mir->plane.pt = face.v[0];
+ mir->plane.normal = face.normal;
+ } else {
+ int plane_idx = obj->mtl.flat_mirror - MTL_MIRROR_AABB_PX;
+ mir->plane = obj->get_aabox().get_plane(plane_idx);
+ }
+
+ mir->wplane = mir->plane;
+ if(obj->node) {
+ const Mat4 &xform = obj->node->get_matrix();
+ mir->wplane.pt = xform * mir->wplane.pt;
+ mir->wplane.normal = normalize(xform.upper3x3() * mir->wplane.normal);
+ }
+
+ // check to see if we have found this mirror plane already
+ bool found = false;
+ FlatMirror *node = mirrors;
+ while(node) {
+ float d1 = dot(mir->wplane.normal, mir->wplane.pt);
+ float d2 = dot(node->wplane.normal, node->wplane.pt);
+
+ if(1.0f - dot(mir->wplane.normal, node->wplane.normal) < 1e-4f &&
+ fabs(d1 - d2) < 1e-4) {
+ found = true;
+ break;
+ }
+ node = node->next;
+ }
+
+ debug_log("[%s@%s] mirror plane: local(%g %g %g %g), world(%g %g %g %g)%s\n",
+ obj->get_name(), obj->node ? obj->node->get_name() : "<no-node>",
+ mir->plane.normal.x, mir->plane.normal.y, mir->plane.normal.z,
+ dot(mir->plane.normal, mir->plane.pt), mir->wplane.normal.x, mir->wplane.normal.y,
+ mir->wplane.normal.z, dot(mir->wplane.normal, mir->wplane.pt), found ? " duplicate" : "");
+
+ if(!found) {
+ mir->next = mirrors;
+ mirrors = mir;
+
+ mir->objects.push_back(obj);
+ objmirror[obj] = mir; // associate with object
+ ++num_mirrors;
+ } else {
+ node->objects.push_back(obj);
+ delete mir;
+ }
+ }
+ }
+ }
+
+ return num_mirrors;
+}
+