diff --git a/newton-4.00/applications/toolsAndWrapers/newtonUnreal/newton/Source/ThirdParty/newtonLibrary/Public/dCollision/ndShapeCompound.cpp b/newton-4.00/applications/toolsAndWrapers/newtonUnreal/newton/Source/ThirdParty/newtonLibrary/Public/dCollision/ndShapeCompound.cpp
index 23ccdff15..b59fbee05 100644
--- a/newton-4.00/applications/toolsAndWrapers/newtonUnreal/newton/Source/ThirdParty/newtonLibrary/Public/dCollision/ndShapeCompound.cpp
+++ b/newton-4.00/applications/toolsAndWrapers/newtonUnreal/newton/Source/ThirdParty/newtonLibrary/Public/dCollision/ndShapeCompound.cpp
@@ -455,8 +455,14 @@ void ndShapeCompound::DebugShape(const ndMatrix& matrix, ndShapeDebugNotify& deb
 
 ndFloat32 ndShapeCompound::GetVolume() const
 {
-	ndAssert(0);
-	return ndFloat32(0.0f);
+	ndFloat32 volume = ndFloat32 (0.0f);
+	ndTreeArray::Iterator iter(m_array);
+	for (iter.Begin(); iter; iter++)
+	{
+		const ndShapeInstance* const collision = iter.GetNode()->GetInfo()->GetShape();
+		volume += collision->GetVolume();
+	}
+	return volume;
 }
 
 ndFloat32 ndShapeCompound::GetBoxMinRadius() const
diff --git a/newton-4.00/applications/toolsAndWrapers/newtonUnreal/newton/Source/newton/Private/NewtonCollisionConvexApproximate.cpp b/newton-4.00/applications/toolsAndWrapers/newtonUnreal/newton/Source/newton/Private/NewtonCollisionConvexApproximate.cpp
index 994edfb51..478ca9fcc 100644
--- a/newton-4.00/applications/toolsAndWrapers/newtonUnreal/newton/Source/newton/Private/NewtonCollisionConvexApproximate.cpp
+++ b/newton-4.00/applications/toolsAndWrapers/newtonUnreal/newton/Source/newton/Private/NewtonCollisionConvexApproximate.cpp
@@ -260,26 +260,28 @@ long long UNewtonCollisionConvexApproximate::CalculateStaticMeshHash() const
 		const UStaticMesh* const staticMesh = staticComponent->GetStaticMesh().Get();
 		check(staticMesh);
 		const FStaticMeshRenderData* const renderData = staticMesh->GetRenderData();
-		check(renderData);
-		const FStaticMeshLODResourcesArray& renderResource = renderData->LODResources;
+		if (renderData)
+		{
+			const FStaticMeshLODResourcesArray& renderResource = renderData->LODResources;
 
-		//const FVector uScale(GetComponentTransform().GetScale3D());
-		//const ndVector scale(ndFloat32(uScale.X), ndFloat32(uScale.Y), ndFloat32(uScale.Z), ndFloat32(0.0f));
-		//const ndVector bakedScale(scale.Scale(UNREAL_INV_UNIT_SYSTEM));
+			//const FVector uScale(GetComponentTransform().GetScale3D());
+			//const ndVector scale(ndFloat32(uScale.X), ndFloat32(uScale.Y), ndFloat32(uScale.Z), ndFloat32(0.0f));
+			//const ndVector bakedScale(scale.Scale(UNREAL_INV_UNIT_SYSTEM));
 
-		const FStaticMeshLODResources& renderLOD = renderResource[0];
-		const FStaticMeshVertexBuffers& staticMeshVertexBuffer = renderLOD.VertexBuffers;;
-		const FPositionVertexBuffer& positBuffer = staticMeshVertexBuffer.PositionVertexBuffer;
-		for (ndInt32 i = 0; i < ndInt32(positBuffer.GetNumVertices()); ++i)
-		{
-			const FVector3f p(positBuffer.VertexPosition(i));
-			hash = ndCRC64(&p, sizeof(FVector3f), hash);
-		}
-		const FRawStaticIndexBuffer& indexBuffer = renderLOD.IndexBuffer;
-		for (ndInt32 i = 0; i < ndInt32(indexBuffer.GetNumIndices()); i += 3)
-		{
-			ndInt32 j = indexBuffer.GetIndex(i);
-			hash = ndCRC64(&j, sizeof(ndInt32), hash);
+			const FStaticMeshLODResources& renderLOD = renderResource[0];
+			const FStaticMeshVertexBuffers& staticMeshVertexBuffer = renderLOD.VertexBuffers;;
+			const FPositionVertexBuffer& positBuffer = staticMeshVertexBuffer.PositionVertexBuffer;
+			for (ndInt32 i = 0; i < ndInt32(positBuffer.GetNumVertices()); ++i)
+			{
+				const FVector3f p(positBuffer.VertexPosition(i));
+				hash = ndCRC64(&p, sizeof(FVector3f), hash);
+			}
+			const FRawStaticIndexBuffer& indexBuffer = renderLOD.IndexBuffer;
+			for (ndInt32 i = 0; i < ndInt32(indexBuffer.GetNumIndices()); i += 3)
+			{
+				ndInt32 j = indexBuffer.GetIndex(i);
+				hash = ndCRC64(&j, sizeof(ndInt32), hash);
+			}
 		}
 	}
 	return hash;
diff --git a/newton-4.00/sdk/dCollision/ndShapeCompound.cpp b/newton-4.00/sdk/dCollision/ndShapeCompound.cpp
index 23ccdff15..3fedc8e95 100644
--- a/newton-4.00/sdk/dCollision/ndShapeCompound.cpp
+++ b/newton-4.00/sdk/dCollision/ndShapeCompound.cpp
@@ -455,8 +455,14 @@ void ndShapeCompound::DebugShape(const ndMatrix& matrix, ndShapeDebugNotify& deb
 
 ndFloat32 ndShapeCompound::GetVolume() const
 {
-	ndAssert(0);
-	return ndFloat32(0.0f);
+	ndFloat32 volume = ndFloat32(0.0f);
+	ndTreeArray::Iterator iter(m_array);
+	for (iter.Begin(); iter; iter++)
+	{
+		const ndShapeInstance* const collision = iter.GetNode()->GetInfo()->GetShape();
+		volume += collision->GetVolume();
+	}
+	return volume;
 }
 
 ndFloat32 ndShapeCompound::GetBoxMinRadius() const