diff --git a/src/physics/triangle_mesh.cpp b/src/physics/triangle_mesh.cpp
index 1c4af20a2..a8ed8ce4f 100644
--- a/src/physics/triangle_mesh.cpp
+++ b/src/physics/triangle_mesh.cpp
@@ -379,6 +379,7 @@ bool TriangleMesh::castRay(const btVector3 &from, const btVector3 &to,
     if(ray_callback.hasHit())
     {
         *xyz      = ray_callback.m_hitPointWorld;
+        xyz->setW(0.0f);
         *material = m_triangleIndex2Material[index];
 
         if(normal)