# Does a UV'd face know what projector it uses?

**URL:** https://forum.highend3d.com/t/does-a-uvd-face-know-what-projector-it-uses/7204
**Category:** Maya
**Tags:** mel
**Created:** [May 25, 2001, 4:00pm UTC](https://forum.highend3d.com/t/does-a-uvd-face-know-what-projector-it-uses/7204 "2001-05-25T16:00:54Z")
**Posts on this page:** 3
**Page:** 1

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### Author: ![jeffd](https://forum.highend3d.com/letter_avatar_proxy/v4/letter/j/71c47a/32.png) [@jeffd](https://forum.highend3d.com/u/jeffd)
#### Post date: [May 25, 2001, 4:00pm UTC](https://forum.highend3d.com/t/does-a-uvd-face-know-what-projector-it-uses/7204/1 "2001-05-25T16:00:54Z")

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Say I have a an object with several mapping projections applied to face selections.

INPUTS  
polyPlanProj2  
polyCylProj1  
polyPlanProj1

Does a face know which projection it is using? For instance, if I selected a face on the mesh, is there any way I could query in MEL which of the projections was is used to pass UVs to that face? I am, of course, assuming that the projector is still in history.

--JeffD

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### Author: ![jeffd](https://forum.highend3d.com/letter_avatar_proxy/v4/letter/j/71c47a/32.png) [@jeffd](https://forum.highend3d.com/u/jeffd)
#### Post date: [May 30, 2001, 5:57am UTC](https://forum.highend3d.com/t/does-a-uvd-face-know-what-projector-it-uses/7204/2 "2001-05-30T05:57:45Z")

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Sorry to bump this, but I have yet to be able answer this question on my own. Thanks.

> [@](#):
>
> In reply to:   
> Say I have a an object with several mapping projections applied to face selections.
> 
> INPUTS  
> polyPlanProj2  
> polyCylProj1  
> polyPlanProj1
> 
> Does a face know which projection it is using? For instance, if I selected a face on the mesh, is there any way I could query in MEL which of the projections was is used to pass UVs to that face? I am, of course, assuming that the projector is still in history.
> 
> --JeffD

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### Author: ![tbriggs](https://forum.highend3d.com/letter_avatar_proxy/v4/letter/t/eb9ed0/32.png) [@tbriggs](https://forum.highend3d.com/u/tbriggs)
#### Post date: [May 31, 2001, 4:00pm UTC](https://forum.highend3d.com/t/does-a-uvd-face-know-what-projector-it-uses/7204/3 "2001-05-31T16:00:47Z")

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This can be tested by experiment. What happens is that the projection node sets uv values on each vertex. These go in the object. You can delete the history at that point and the projection node is gone and uv info is maintained.

/\*In theory there is no difference between theory and practice  
In practice they are very different\*/