Fix traversal of root children during animation.

1 files changed, 11 insertions, 3 deletions

diff --git a/gfx/src/scene/animation.c b/gfx/src/scene/animation.c
index 91d3e08..8d8178e 100644
--- a/gfx/src/scene/animation.c
+++ b/gfx/src/scene/animation.c
@@ -328,7 +328,8 @@ static void compute_joint_matrices_rec(
   while (child.val != 0) {
     compute_joint_matrices_rec(
         child, global_joint_transform, root_inv_global_transform);
-    node  = mem_get_node(child);
+    node = mem_get_node(child);
+    assert(node);
     child = node->next; // Next sibling.
   }
 }
@@ -384,8 +385,15 @@ void gfx_update_animation(Anima* anima, R t) {
   // LOGD("Root: %u, child: %u", root_index.val, root->child.val);
   const mat4 root_global_transform     = gfx_get_node_global_transform(root);
   const mat4 root_inv_global_transform = mat4_inverse(root_global_transform);
-  compute_joint_matrices_rec(
-      root->child, root_global_transform, &root_inv_global_transform);
+  // Step over root's children (siblings of the first child).
+  node_idx child = root->child;
+  while (child.val != 0) {
+    compute_joint_matrices_rec(
+        child, root_global_transform, &root_inv_global_transform);
+    SceneNode* node = mem_get_node(child);
+    assert(node);
+    child = node->next; // Next sibling.
+  }
 }
 
 const Skeleton* gfx_get_anima_skeleton(const Anima* anima, size_t i) {