From b5af7f967e6d5d2e7432d6efa2f47050a5bfc576 Mon Sep 17 00:00:00 2001
From: Hans Goudey <h.goudey@me.com>
Date: Tue, 30 Aug 2022 14:50:00 -0500
Subject: Fix cycles retrieval of material indices

---
 intern/cycles/blender/mesh.cpp | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/intern/cycles/blender/mesh.cpp b/intern/cycles/blender/mesh.cpp
index 4a2611638b7..2e2dfd6583b 100644
--- a/intern/cycles/blender/mesh.cpp
+++ b/intern/cycles/blender/mesh.cpp
@@ -972,7 +972,7 @@ static void create_mesh(Scene *scene,
   std::optional<BL::IntAttribute> material_indices = find_material_index_attribute(b_mesh);
   auto get_material_index = [&](const int poly_index) -> int {
     if (material_indices) {
-      return clamp(material_indices->data[poly_index], 0, used_shaders.size() - 1);
+      return clamp(material_indices->data[poly_index].value(), 0, used_shaders.size() - 1);
     }
     return 0;
   };
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