From 0fc958a174192b2b25c4187c170ec4a394dc308a Mon Sep 17 00:00:00 2001
From: Hans Goudey <h.goudey@me.com>
Date: Wed, 2 Nov 2022 13:59:25 +0100
Subject: Fix: Crash adding rest positions to empty mesh

The position attribute might not exist when the mesh is empty, which may
be another problem, but there is no need to count on it here.
---
 source/blender/blenkernel/intern/DerivedMesh.cc | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

(limited to 'source/blender/blenkernel')

diff --git a/source/blender/blenkernel/intern/DerivedMesh.cc b/source/blender/blenkernel/intern/DerivedMesh.cc
index 11ef2b08df4..97ff45e93ce 100644
--- a/source/blender/blenkernel/intern/DerivedMesh.cc
+++ b/source/blender/blenkernel/intern/DerivedMesh.cc
@@ -747,7 +747,7 @@ static void mesh_calc_modifiers(struct Depsgraph *depsgraph,
     MutableAttributeAccessor attributes = mesh_final->attributes_for_write();
     SpanAttributeWriter<float3> rest_positions =
         attributes.lookup_or_add_for_write_only_span<float3>("rest_position", ATTR_DOMAIN_POINT);
-    if (rest_positions) {
+    if (rest_positions && attributes.domain_size(ATTR_DOMAIN_POINT) > 0) {
       attributes.lookup<float3>("position").materialize(rest_positions.span);
       rest_positions.finish();
     }
-- 
cgit v1.2.3