Question Graphics.DrawMesh - Mesh transform is rounded and drawn with offset

Hi,

I'm drawing a hover mesh using the Graphics.DrawMesh function as soon a object hits a box collider. The drawing works well, but it seems that the function rounds the variables for transfom and rotation. This causes a slight offset of the hover mesh to its original position.
Is there a way to force the Graphics.DrawMesh to use all decimals (e.g. 5) to draw the mesh with precision?

Code (CSharp):

1.         protected virtual void DrawHoveredInteractables()
2.         {
3.             if (interactableHoverMeshMaterial == null)
4.                 return;
5.             float hoveredScale = Mathf.Max(0.0f, m_InteractableHoverScale);
6.             for (int i = 0; i < m_HoverTargets.Count; i++)
7.             {
8.                 var hoverTarget = m_HoverTargets[i] as XRGrabInteractable;
9.                 if (hoverTarget == null || hoverTarget == selectTarget)
10.                     continue;
11.  
12.                 MeshFilter[] interactableMeshFilters = null;
13.                 if (m_MeshFilterCache.TryGetValue(hoverTarget, out interactableMeshFilters))
14.                 {
15.                     if (interactableMeshFilters != null && interactableMeshFilters.Length > 0)
16.                     {
17.                         foreach (var meshFilter in interactableMeshFilters)
18.                         {
19.                             if (meshFilter != null && (Camera.main.cullingMask & (1 << meshFilter.gameObject.layer)) != 0)
20.                             {
21.  
22.                                 int iSubMeshCount = meshFilter.mesh.subMeshCount;
23.                                 for (int j = 0; j < iSubMeshCount; ++j)
24.                                 {
25.                                     Graphics.DrawMesh(meshFilter.sharedMesh, attachTransform.position, attachTransform.rotation, interactableHoverMeshMaterial, gameObject.layer, null, j, null, true, true);
26.                                 }
27.  
28.                             }
29.                         }
30.                     }
31.                 }
32.             }
33.         }

 

You could try:

Graphics.DrawMesh(meshFilter.sharedMesh, attachTransform.localToWorldMatrix, interactableHoverMeshMaterial, gameObject.layer, null, j, null, true, true);

Position and rotation are derived from the world matrix anyway, so perhaps that's sensitive to inaccuracy.

 

Thanks for your suggestion, unfortunately this doesn't change anything.