diff --git a/panda/src/egg2pg/eggSaver.cxx b/panda/src/egg2pg/eggSaver.cxx
index ba4ee35d7f..99a36c50a7 100644
--- a/panda/src/egg2pg/eggSaver.cxx
+++ b/panda/src/egg2pg/eggSaver.cxx
@@ -479,7 +479,12 @@ convert_collision_node(CollisionNode *node, const WorkingNodePath &node_path,
           egg_sphere->set_collide_flags(EggGroup::CF_descend);
           egg_group->add_child(egg_sphere);
         }
-        egg_sphere->set_cs_type(EggGroup::CST_sphere);
+
+        if (child->is_of_type(CollisionInvSphere::get_class_type())) {
+          egg_sphere->set_cs_type(EggGroup::CST_inv_sphere);
+        } else {
+          egg_sphere->set_cs_type(EggGroup::CST_sphere);
+        }
 
         EggVertex ev1, ev2;
         ev1.set_pos(LCAST(double, (center + offset) * net_mat));
@@ -531,13 +536,77 @@ convert_collision_node(CollisionNode *node, const WorkingNodePath &node_path,
         egg_poly->add_vertex(cvpool->create_unique_vertex(ev2));
 
       } else if (child->is_of_type(CollisionBox::get_class_type())) {
-        nout << "Encountered unhandled collsion type: CollisionBox" << "\n";
-      } else if (child->is_of_type(CollisionInvSphere::get_class_type())) {
-        nout << "Encountered unhandled collsion type: CollisionInvSphere" << "\n";
+        CPT(CollisionBox) box = DCAST(CollisionBox, child);
+        LPoint3 min_point = box->get_min();
+        LPoint3 max_point = box->get_max();
+
+        EggGroup *egg_box;
+        if (num_solids == 1) {
+          egg_box = egg_group;
+        } else {
+          egg_box = new EggGroup;
+          egg_box->set_collide_flags(EggGroup::CF_descend);
+          egg_group->add_child(egg_box);
+        }
+        egg_box->set_cs_type(EggGroup::CST_box);
+
+        // Just add the min and max points.
+        EggVertex ev0, ev1;
+        ev0.set_pos(LCAST(double, min_point * net_mat));
+        ev1.set_pos(LCAST(double, max_point * net_mat));
+
+        EggLine *egg_poly = new EggLine;
+        egg_box->add_child(egg_poly);
+
+        egg_poly->add_vertex(cvpool->create_unique_vertex(ev0));
+        egg_poly->add_vertex(cvpool->create_unique_vertex(ev1));
+
       } else if (child->is_of_type(CollisionTube::get_class_type())) {
-        nout << "Encountered unhandled collsion type: CollisionTube" << "\n";
+        CPT(CollisionTube) tube = DCAST(CollisionTube, child);
+        LPoint3 point_a = tube->get_point_a();
+        LPoint3 point_b = tube->get_point_b();
+        LPoint3 centroid = (point_a + point_b) * 0.5f;
+
+        // Also get an arbitrary vector perpendicular to the tube.
+        LVector3 axis = point_b - point_a;
+        LVector3 sideways;
+        if (abs(axis[2]) > abs(axis[1])) {
+          sideways = axis.cross(LVector3(0, 1, 0));
+        } else {
+          sideways = axis.cross(LVector3(0, 0, 1));
+        }
+        sideways.normalize();
+        sideways *= tube->get_radius();
+        LVector3 extend = axis.normalized() * tube->get_radius();
+
+        EggGroup *egg_tube;
+        if (num_solids == 1) {
+          egg_tube = egg_group;
+        } else {
+          egg_tube = new EggGroup;
+          egg_tube->set_collide_flags(EggGroup::CF_descend);
+          egg_group->add_child(egg_tube);
+        }
+        egg_tube->set_cs_type(EggGroup::CST_tube);
+
+        // Add two points for the endcaps, and then two points around the
+        // centroid to indicate the radius.
+        EggVertex ev0, ev1, ev2, ev3;
+        ev0.set_pos(LCAST(double, (point_a - extend) * net_mat));
+        ev1.set_pos(LCAST(double, (centroid + sideways) * net_mat));
+        ev2.set_pos(LCAST(double, (point_b + extend) * net_mat));
+        ev3.set_pos(LCAST(double, (centroid - sideways) * net_mat));
+
+        EggPolygon *egg_poly = new EggPolygon;
+        egg_tube->add_child(egg_poly);
+
+        egg_poly->add_vertex(cvpool->create_unique_vertex(ev0));
+        egg_poly->add_vertex(cvpool->create_unique_vertex(ev1));
+        egg_poly->add_vertex(cvpool->create_unique_vertex(ev2));
+        egg_poly->add_vertex(cvpool->create_unique_vertex(ev3));
+
       } else {
-        nout << "Encountered unknown CollisionSolid" << "\n";
+        nout << "Encountered unknown collision solid type " << child->get_type() << "\n";
       }
     }
   }