bugfix [#22581]

- on instances last hit optimization was jumping to the last hit face
 inside an instance without doing space transformation.

Fixed by making last hit optimization jump to the root node of the instance
instead of the last hit face.

1 files changed, 7 insertions, 0 deletions

diff --git a/source/blender/render/intern/source/rayobject_instance.c b/source/blender/render/intern/source/rayobject_instance.c
index c36ab454f3d..25765c4763a 100644
--- a/source/blender/render/intern/source/rayobject_instance.c
+++ b/source/blender/render/intern/source/rayobject_instance.c
@@ -143,6 +143,13 @@ static int  RE_rayobject_instance_intersect(RayObject *o, Isect *isec)
 	{
 		isec->labda *= dist / isec->dist;
 		isec->hit.ob = obj->ob;
+
+#ifdef RT_USE_LAST_HIT	
+		// TODO support for last hit optimization in instances that can jump
+		// directly to the last hit face.
+		// For now it jumps directly to the last-hit instance root node.
+		isec->last_hit = RE_rayobject_unalignRayAPI((RayObject*) obj);
+#endif
 	}
 	isec->dist = dist;
 	VECCOPY( isec->start, start );