Edit NURBS UVs

Maya provides limited support for editing the UV texture coordinates of NURBS surfaces within the UV Texture Editor. Edit NURBS UV mode is useful for games developers who use NURBS surface types in games applications and require the ability to modify an explicit UV set for subsequent export to a games engine. This feature does not provide support for editing NURBS UVs for use with texture mapping or image rendering features within Maya.

Edit NURBS UV mode creates an explicit and unique UV set for the NURBS surface. The user switches between the implicit UVs for the NURBS surface and the explicitly created UV set. It is then possible to edit the explicit NURBS UVs on a limited basis.

It is recommended that you create and edit the explicit NURBS UVs only when all editing and modification of the NURBS surface model is complete. See the Notes and Edit NURBS UVs Limitations below.

For more information on the MEL ^TM commands and flags that provide this functionality, see the nurbsUVSet, nurbsEditUV commands in the MEL guide.

To edit UVs for a NURBS surface in the UV Texture Editor

1. In the scene view, select the NURBS surface that you want to create and edit explicit UVs for texturing.
2. Ensure that the construction history for the NURBS surface is deleted by selecting Edit > Delete All by Type > History.

   Deleting construction history prior to making any UV edits ensures that subsequent updates to the node dependency graph do not remove the UV edits you make to the explicit NURBS UV set. Do this only when you are sure you will no longer be required to edit the model (Save a copy of the model that contains construction history in case you need to revert back for any reason).

3. Turn off construction history while you work on the NURBS UVs using the Construction History on/off icon on the Status Line.
4. Open the UV Texture Editor by selecting Edit UVs > UV Texture Editor.

   The NURBS UVs that are implicitly created with the NURBS surface appear in the 2D view of the UV Texture Editor.

5. In the UV Texture Editor, + click in the 2D view, and select Edit NURBS UV mode from the marking menu that appears.

   A UV set for the NURBS surface is explicitly created and displayed in the 2D view of the UV Texture Editor. The NURBS UV set created is based on the topology of the NURBS surface.

6. Change the selection method to UVs by doing one of the following:
   • + click in the scene view and select Surface UV from the marking menu.
   • + click in the 2D view of the UV Texture Editor, and select UV from the marking menu.
7. Select the UVs you want to modify in either the scene view or in the 2D view of the UV Texture Editor.
8. Using the transformation tools from the Toolbox (Move Tool, Rotate Tool, or Scale Tool), edit the position of the NURBS UVs in the UV Texture Editor.