Fix T94232: No selection with set material node empty material list
If the input mesh had no materials already, the new material would become the only material on the mesh, meaning the material was added to all of the faces, instead of just the selected faces. The mesh primitive nodes in geometry nodes already add an empty slot by default, so this only affects outside geometry. The fix is just adding an empty slot before the new slot, so the non-selected material indices can still point to an empty slot. Differential Revision: https://developer.blender.org/D13654
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blender-bot
2023-02-14 01:11:05 +01:00
Referenced by issue #94232, Inconsistent Behavior of Set Material Node
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@ -40,6 +40,12 @@ static void node_declare(NodeDeclarationBuilder &b)
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static void assign_material_to_faces(Mesh &mesh, const IndexMask selection, Material *material)
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{
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if (selection.size() != mesh.totpoly) {
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/* If the entire mesh isn't selected, and there is no material slot yet, add an empty
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* slot so that the faces that aren't selected can still refer to the default material. */
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BKE_id_material_eval_ensure_default_slot(&mesh.id);
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}
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int new_material_index = -1;
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for (const int i : IndexRange(mesh.totcol)) {
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Material *other_material = mesh.mat[i];
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