by reference

src/python/magnum/scenegraph.cpp

@@ -39,14 +39,13 @@ template<UnsignedInt dimensions, class T> struct PyDrawable: SceneGraph::PyFeatu
     explicit PyDrawable(SceneGraph::AbstractObject<dimensions, T>& object, SceneGraph::DrawableGroup<dimensions, T>* drawables): SceneGraph::PyFeature<SceneGraph::Drawable<dimensions, T>>{object, drawables} {}
 
     void draw(const MatrixTypeFor<dimensions, T>& transformationMatrix, SceneGraph::Camera<dimensions, T>& camera) override {
-        PYBIND11_OVERLOAD_PURE_NAME(
-            void,
-            PyDrawable,
-            "draw",
-            draw,
-            transformationMatrix,
-            camera
-        );
+        py::gil_scoped_acquire gil;
+        py::function override = py::get_override(static_cast<const PyDrawable*>(this), "draw");
+        if(!override) {
+            py::pybind11_fail("Tried to call pure virtual function \"PyDrawable::draw\"");
+        }
+        override(transformationMatrix,
+                 py::cast(&camera, py::return_value_policy::reference));
     }
 };