diff -r b3da4096c607 -r 18de2af03531 src/scene.c
--- a/src/scene.c	Tue Mar 26 20:37:21 2024 +0100
+++ b/src/scene.c	Thu Mar 28 23:30:21 2024 +0100
@@ -123,12 +123,18 @@
             node->update_func(node);
         }
         if (node->need_transform_update) {
-            assert(node->transform_update_func != NULL);
             node->need_transform_update = false;
-            asc_transform_identity(node->local_transform);
-            asc_transform_copy(node->world_transform, node->parent->world_transform);
-            node->transform_update_func(node);
-            asc_mat4f_mulst(node->final_transform, node->local_transform, node->world_transform);
+            asc_transform_from_parts(
+                    node->transform,
+                    node->position,
+                    node->scale,
+                    node->rotation
+            );
+            asc_mat4f_mulst(
+                    node->world_transform,
+                    node->transform,
+                    node->parent->world_transform
+            );
         }
 
         // add to render group
@@ -174,7 +180,7 @@
         // Sprites
         // -------
         // TODO: see if we can really always ignore the view matrix
-        shader = &asc_context.active_window->glctx.shader.sprite;
+        shader = &asc_context.active_window->glctx.shader.sprite.base;
         glUseProgram(shader->id);
         glUniformMatrix4fv(shader->projection, 1,
                            GL_FALSE, camera->projection);
@@ -192,9 +198,8 @@
 AscSceneNode *asc_scene_node_empty(void) {
     AscSceneNode *node = calloc(1, sizeof(AscSceneNode));
     node->free_func = (asc_scene_free_func) free;
-    asc_transform_identity(node->local_transform);
+    asc_transform_identity(node->transform);
     asc_transform_identity(node->world_transform);
-    asc_transform_identity(node->final_transform);
     return node;
 }
 
@@ -260,9 +265,12 @@
     );
 }
 
-void asc_node_update_transform(AscSceneNode *node) {
+void asc_update_transform(AscSceneNode *node) {
+    if (node->need_transform_update) return;
+
     CxTreeIterator iter = asc_scene_node_iterator(node, false);
     cx_foreach(AscSceneNode*, n, iter) {
+        // TODO: break/continue when subtree is already marked for update
         n->need_transform_update = true;
     }
-}
\ No newline at end of file
+}