[Bf-blender-cvs] [5441f5fc90c] blender-v2.93-release: Fix T87582: incorrect interpolation from edge to corner domain

[Jacques Lucke]

Commit: 5441f5fc90c600aa5bbd08c8cd212fb0734f86cc
Author: Jacques Lucke
Date:   Fri Apr 23 13:07:29 2021 +0200
Branches: blender-v2.93-release
https://developer.blender.org/rB5441f5fc90c600aa5bbd08c8cd212fb0734f86cc

Fix T87582: incorrect interpolation from edge to corner domain

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M	source/blender/blenkernel/intern/geometry_component_mesh.cc

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diff --git a/source/blender/blenkernel/intern/geometry_component_mesh.cc b/source/blender/blenkernel/intern/geometry_component_mesh.cc
index 150cc4589c8..5697fb2ccde 100644
--- a/source/blender/blenkernel/intern/geometry_component_mesh.cc
+++ b/source/blender/blenkernel/intern/geometry_component_mesh.cc
@@ -547,7 +547,7 @@ void adapt_mesh_domain_edge_to_corner_impl(const Mesh &mesh,
 
     /* For every corner, mix the values from the adjacent edges on the face. */
     for (const int loop_index : IndexRange(poly.loopstart, poly.totloop)) {
-      const int loop_index_prev = (loop_index - 1) % poly.totloop;
+      const int loop_index_prev = loop_index - 1 + (loop_index == poly.loopstart) * poly.totloop;
       const MLoop &loop = mesh.mloop[loop_index];
       const MLoop &loop_prev = mesh.mloop[loop_index_prev];
       mixer.mix_in(loop_index, old_values[loop.e]);