Renaming a UV map breaks references in UV map nodes #55610

New Issue

Phil Stopford · 2018-06-25T02:46:24+02:00

Phil Stopford commented

2018-06-25 02:46:24 +02:00

System Information
Win 10 Pro, 6 GB GTX 1060

Blender Version
Broken: 2.79b, 86e20a2

Short description of error
Renaming a UV map within the mesh panel fails to update UV map entries - they go red.

Exact steps for others to reproduce the error
Create an object with a UV map.
Set up node surfacing for a material on the object, using the 'UV map' node. Select the existing UV map.
Rename the UV map in the mesh tab for the object; check the UV map node in the shading node graph. It will be red.

**System Information** Win 10 Pro, 6 GB GTX 1060 **Blender Version** Broken: 2.79b, 86e20a2 **Short description of error** Renaming a UV map within the mesh panel fails to update UV map entries - they go red. **Exact steps for others to reproduce the error** Create an object with a UV map. Set up node surfacing for a material on the object, using the 'UV map' node. Select the existing UV map. Rename the UV map in the mesh tab for the object; check the UV map node in the shading node graph. It will be red.

Phil Stopford commented

2018-06-25 02:46:24 +02:00

Added subscriber: @phil.stopford

Philipp Oeser commented

2018-06-25 13:56:39 +02:00

Added subscribers: @brecht, @lichtwerk

Philipp Oeser commented

2018-06-25 13:56:39 +02:00

Changed status from 'Open' to: 'Archived'

Philipp Oeser closed this issue

2018-06-25 13:56:39 +02:00

Philipp Oeser self-assigned this 2018-06-25 13:56:39 +02:00

Philipp Oeser commented

2018-06-25 13:56:39 +02:00

I think this is by design (the fact this is namebased).

Consider the fact that Materials or NodeTrees might be used by multiple different objects: how would choosing a UVMap work then if it was tied to a specific object's UVMap?
If two objects would use this Node (both having a UVMap called "MyUVMap"), if you then rename the UVMap of one object, what should happen to the UVMap node? (if it changed, it would break on the second object...)

Anyways, dont think there's a bug here (dont even think this is a limitation aka could be improved...)

Might be wrong on this though [if @brecht thinks there's something to be done here: feel free to reopen...]

Closing.

I think this is by design (the fact this is namebased). Consider the fact that Materials or NodeTrees might be used by multiple different objects: how would choosing a UVMap work then if it was tied to a specific object's UVMap? If two objects would use this Node (both having a UVMap called "MyUVMap"), if you then rename the UVMap of one object, what should happen to the UVMap node? (if it changed, it would break on the second object...) Anyways, dont think there's a bug here (dont even think this is a limitation aka could be improved...) Might be wrong on this though [if @brecht thinks there's something to be done here: feel free to reopen...] Closing.

Phil Stopford commented

2018-06-25 13:59:44 +02:00

For additional background, I ran into this following Brecht's advice on devtalk about how to workaround the UV map per object limitation; I went through renaming the UV maps on each object (prior to joining the meshes together) and all of the surfacing broke (since I'd made an explicit reference to each UV map in the surfacing). It was a fair bit of work to fix this up, so it felt like a bug (lack of notification or something)

Philipp Oeser commented

2018-06-25 14:22:47 +02:00

@phil.stopford : thx for getting back, for reference: we are talking about https://devtalk.blender.org/t/origin-of-uv-map-limit-in-blender/1014, right?
Anyways, dont think this additional background info would change the fact that this is not a bug [imo].

@phil.stopford : thx for getting back, for reference: we are talking about https://devtalk.blender.org/t/origin-of-uv-map-limit-in-blender/1014, right? Anyways, dont think this additional background info would change the fact that this is not a bug [imo].

Phil Stopford commented

2018-06-25 14:24:47 +02:00

Indeed. I'm just offering additional background to help any decision from Brecht at this point :)

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Renaming a UV map breaks references in UV map nodes #55610