From 68983ad0d02d5ce4ea7b63f7964cb63743234ad7 Mon Sep 17 00:00:00 2001
From: Par Winzell <zell@fb.com>
Date: Sun, 8 Apr 2018 17:54:42 -0700
Subject: [PATCH] Fix skinning edge case.

A mesh with a single (skinning) deformer which had zero clusters would
erroneously register as skinned, leading GetRoodNode() to an assertion
failure. Fixed.
---
 src/Fbx2Raw.cpp | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/src/Fbx2Raw.cpp b/src/Fbx2Raw.cpp
index 671db6c..2b072d0 100644
--- a/src/Fbx2Raw.cpp
+++ b/src/Fbx2Raw.cpp
@@ -401,12 +401,14 @@ public:
         for (int deformerIndex = 0; deformerIndex < pMesh->GetDeformerCount(); deformerIndex++) {
             FbxSkin *skin = reinterpret_cast< FbxSkin * >( pMesh->GetDeformer(deformerIndex, FbxDeformer::eSkin));
             if (skin != nullptr) {
+                const int clusterCount = skin->GetClusterCount();
+                if (clusterCount == 0) {
+                    continue;
+                }
                 int controlPointCount = pMesh->GetControlPointsCount();
-
                 vertexJointIndices.resize(controlPointCount, Vec4i(0, 0, 0, 0));
                 vertexJointWeights.resize(controlPointCount, Vec4f(0.0f, 0.0f, 0.0f, 0.0f));
 
-                const int clusterCount = skin->GetClusterCount();
                 for (int clusterIndex = 0; clusterIndex < clusterCount; clusterIndex++) {
                     FbxCluster   *cluster        = skin->GetCluster(clusterIndex);
                     const int    indexCount      = cluster->GetControlPointIndicesCount();