OpenSubdiv limitations

• OpenSubdiv does not support:
  • Non-manifold meshes

    Maya automatically defaults to Maya Catmull-Clark for meshes that contain non-manifold components.

    When OpenSubdiv cannot be used, an error message appears in the Script Editor and the polyShape node, indicating that the Maya Catmull-Clark subdivision method is active.

    Note: Modeling operations can generate non-manifold components temporarily. When a non-manifold mesh becomes manifold, the warning messages disappear and the subdivision method automatically switches to OpenSubdiv.
• Due to driver issues, OpenCL acceleration for OpenSubdiv Catmull-Clark Uniform subdivision method does not work properly on Mac OS X systems with a Quadro 4000 card. To disable acceleration, use the environment variable MAYA_OPENCL_IGNORE_DRIVER_VERSION = 1.

• OpenSubdiv Catmull-Clark Adaptive does not support:
  • Depth of field
  • Use Default Material
  • Depth peeling
  • Plug-in shader implemented with MPxShaderOverride
• OpenSubdiv Catmull-Clark Adaptive only supports OpenGL 4 and DirectX11 compatible graphics cards.

  Maya automatically defaults to Maya Catmull-Clark when OpenGL 4 or DirectX11 are not supported.

OpenSubdiv Displacement preview is derived from OpenSubdiv Catmull-Clark Adaptive, and thus shares its limitations.

• Additionally, OpenSubdiv Displacement preview does not support:
  • File texture node parameters (Alpha gain, etc).
  • Non-tangent space vector displacements (i.e. global space not supported).