From b7f88f30636659ced8cddfdce12309b8f78c631b Mon Sep 17 00:00:00 2001
From: Kim Kulling <kim.kulling@googlemail.com>
Date: Mon, 26 Jul 2021 10:51:16 +0200
Subject: [PATCH] closes https://github.com/assimp/assimp/issues/3957: checkj
 for empty positions.

---
 code/AssetLib/Collada/ColladaLoader.cpp | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/code/AssetLib/Collada/ColladaLoader.cpp b/code/AssetLib/Collada/ColladaLoader.cpp
index 492e6971f..ee8f97203 100644
--- a/code/AssetLib/Collada/ColladaLoader.cpp
+++ b/code/AssetLib/Collada/ColladaLoader.cpp
@@ -619,6 +619,10 @@ aiMesh *ColladaLoader::CreateMesh(const ColladaParser &pParser, const Mesh *pSrc
         dstMesh->mName = pSrcMesh->mId;
     }
 
+    if (pSrcMesh->mPositions.empty()) {
+        return dstMesh.release();
+    }
+
     // count the vertices addressed by its faces
     const size_t numVertices = std::accumulate(pSrcMesh->mFaceSize.begin() + pStartFace,
             pSrcMesh->mFaceSize.begin() + pStartFace + pSubMesh.mNumFaces, size_t(0));