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

Discussion in 'Scripting' started by Bahmann, Sep 10, 2020.

  1. Bahmann

    Bahmann

    Joined:
    Mar 5, 2019
    Posts:
    14
    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.         }
    upload_2020-9-10_8-10-57.png
     
  2. StaggartCreations

    StaggartCreations

    Joined:
    Feb 18, 2015
    Posts:
    1,185
    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.
     
  3. Bahmann

    Bahmann

    Joined:
    Mar 5, 2019
    Posts:
    14

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