From dc22fa406150fbbde86083ae614656479448d864 Mon Sep 17 00:00:00 2001
From: Chandler Cox <mr.chandlercox@gmail.com>
Date: Thu, 18 Dec 2025 21:49:03 -0600
Subject: [PATCH] Fix blend shape always applying zero weight if default weight
 is zero.

---
 Source/Engine/Level/Actors/AnimatedModel.cpp | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/Source/Engine/Level/Actors/AnimatedModel.cpp b/Source/Engine/Level/Actors/AnimatedModel.cpp
index 343710183..f75174f72 100644
--- a/Source/Engine/Level/Actors/AnimatedModel.cpp
+++ b/Source/Engine/Level/Actors/AnimatedModel.cpp
@@ -668,7 +668,11 @@ void AnimatedModel::RunBlendShapeDeformer(const MeshBase* mesh, MeshDeformationD
         {
             if (q.First == blendShape.Name)
             {
-                const float weight = q.Second * blendShape.Weight;
+                float weight = q.Second;
+                if (!Math::IsZero(blendShape.Weight))
+                    weight *= blendShape.Weight;
+                if (Math::IsZero(weight))
+                    break;
                 blendShapes.Add(Pair<const BlendShape&, const float>(blendShape, weight));
                 minVertexIndex = Math::Min(minVertexIndex, blendShape.MinVertexIndex);
                 maxVertexIndex = Math::Max(maxVertexIndex, blendShape.MaxVertexIndex);