Grid mesh with x/y_subdivisions = 1762, 896 creates broken UV map #68314

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Wolfgang Strobl · 2019-08-06T15:07:15+02:00

Wolfgang Strobl commented

2019-08-06 15:07:15 +02:00

System Information
Operating system: Windows 10 Home, Ubuntu 18.04
Graphics card: builtin Intel GPU on Windows, Nvidia 1050 Ti on Ubuntu

Blender Version2.80 (sub 75), branch: master, commit date: 2019-07-29 14:47, hash: f6cb5f5449
Works: recent development versions for 2.81

Short description of error

Grid mesh with subdivisions produce incorrect UV maps, depending on the number of subdivisions

Exact steps for others to reproduce the error
See the following script. Doing it manually gives identical results. Didn't find a pattern. Tried developer build from today and yesterday, those work as expected, i.e. produce a UV pattern like in "Correct" for all number pairs that I tried.

import bpy
w=1762
h=896
bpy.ops.mesh.primitive_grid_add(x_subdivisions=w, y_subdivisions=h, size=1.0, enter_editmode=False, location=(0,0,0))
grid=bpy.context.active_object
grid.name="Kaputt2"

w=1763
h=896
bpy.ops.mesh.primitive_grid_add(x_subdivisions=w, y_subdivisions=h, size=1.0, enter_editmode=False, location=(0,0,0))
grid=bpy.context.active_object
grid.name="Correct"

**System Information** Operating system: Windows 10 Home, Ubuntu 18.04 Graphics card: builtin Intel GPU on Windows, Nvidia 1050 Ti on Ubuntu **Blender Version**2.80 (sub 75), branch: master, commit date: 2019-07-29 14:47, hash: f6cb5f54494e Works: recent development versions for 2.81 **Short description of error** Grid mesh with subdivisions produce incorrect UV maps, depending on the number of subdivisions **Exact steps for others to reproduce the error** See the following script. Doing it manually gives identical results. Didn't find a pattern. Tried developer build from today and yesterday, those work as expected, i.e. produce a UV pattern like in "Correct" for all number pairs that I tried. ``` import bpy w=1762 h=896 bpy.ops.mesh.primitive_grid_add(x_subdivisions=w, y_subdivisions=h, size=1.0, enter_editmode=False, location=(0,0,0)) grid=bpy.context.active_object grid.name="Kaputt2" w=1763 h=896 bpy.ops.mesh.primitive_grid_add(x_subdivisions=w, y_subdivisions=h, size=1.0, enter_editmode=False, location=(0,0,0)) grid=bpy.context.active_object grid.name="Correct" ``` ![Kaputt2.JPG](https://archive.blender.org/developer/F7651611/Kaputt2.JPG) ![Kaputt2a.JPG](https://archive.blender.org/developer/F7651613/Kaputt2a.JPG) ![Correct.JPG](https://archive.blender.org/developer/F7651615/Correct.JPG)

Wolfgang Strobl commented

2019-08-06 15:07:15 +02:00

Added subscriber: @ws01

William Reynish commented

2019-08-06 15:09:34 +02:00

Added subscriber: @WilliamReynish

William Reynish commented

2019-08-06 15:09:34 +02:00

This should be fixed already. Can you try the latest build on builder.blender.org? Thanks

Wolfgang Strobl commented

2019-08-06 15:18:06 +02:00

Well, I already did, see "Works: recent development versions for 2.81" and "Tried developer build from today and yesterday, those work as expected, i.e. produce a UV pattern like in "Correct" for all number pairs that I tried." above.

Wolfgang Strobl commented

2019-08-06 16:02:18 +02:00

I wrote a bug report because the behaviour looks somewhat random and because I did't find an earlier report, so it might show up in later builds, again, because it seems, well, random. Given that we will have to wait for an 2.81 release, it would be beneficial to know about possible workarounds. If it is indeed already fixed, it might be possible to deduce that from the actual fix.

William Reynish commented

2019-08-06 17:43:41 +02:00

Changed status from 'Open' to: 'Resolved'

William Reynish closed this issue

2019-08-06 17:43:41 +02:00

William Reynish self-assigned this 2019-08-06 17:43:41 +02:00

William Reynish commented

2019-08-06 17:43:41 +02:00

If it works in the latest builds, it is resolved. If this is important, you could just use a newer build rather than 2.80

Wolfgang Strobl commented

2019-08-06 17:44:35 +02:00

Well, thanks. :(

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Grid mesh with x/y_subdivisions = 1762, 896 creates broken UV map #68314