private void transformSkull(Matrix4x4 latestSkullTransformationMatrix)
 {
     if (latestSkullTransformationMatrix != null)
     {
         skullObject.transform.position = HoloEvacUtils.PositionFromMatrix(latestSkullTransformationMatrix);
         skullObject.transform.rotation = HoloEvacUtils.QuaternionFromMatrix(latestSkullTransformationMatrix);
     }
 }
    private void transformTool(Matrix4x4 latestSkullTransformationMatrix, Matrix4x4 latestToolTransformationMatrix)
    {
        if (latestSkullTransformationMatrix != null && latestToolTransformationMatrix != null)
        {
            // Transform tool's position from HoloLens marker coordinate space to skull's coordinate space
            Matrix4x4 toolPositionInSkullSpace = latestSkullTransformationMatrix * latestToolTransformationMatrix;

            toolObject.transform.position = HoloEvacUtils.PositionFromMatrix(toolPositionInSkullSpace);
            toolObject.transform.rotation = HoloEvacUtils.QuaternionFromMatrix(toolPositionInSkullSpace);
        }
    }