Applying a boolean modifier can delete UV maps or add empty ones #60076

New Issue

Richard Kennaway · 2019-01-02T16:40:56+01:00

Richard Kennaway commented

2019-01-02 16:40:56 +01:00

System Information
Operating system: OSX Mojave (10.14.2)
Graphics card: NVIDIA GeForce GTX 780M 4096 MB

Blender Version
Broken: 2.80 Beta, 4dd0a90f42, 2019-01-01
Broken (but differently) 2.79, 111179beb0, 2018-12-27, and the 2.79b release.

Short description of error

Applying a boolean modifier can cause a UV map to be deleted in 2.80, or an extra one to be added in 2.79, depending on whether one of the arguments has a UV map.

When I use a boolean difference operator to transform a shape A into A-B:

If A has a UV map and B does not, then in 2.80, A-B has no UV map. In 2.79 it works as expected: A-B has a single UV map that maps faces descending from A in the natural way and faces descending from B to (0,0).

If A and B both have UV maps then in 2.80 this works as expected: the new object has a single UV map computed in the natural way from those of A and B. In 2.79, the result also has the expected UV map, but it acquires a second UV map that maps every face to (0,0).

Exact steps for others to reproduce the error

The attached .blend files illustrate this, one for 2.79 and one for 2.80. Both files contain the same objects. The colours are for identification of parts.

Red: Cube has UV map, plane does not. The cube has a boolean difference modifier with the plane.
Green: As Red, after applying modifier. In 2.80, the cube has no UV map. In 2.79, it has the expected UV map.

Yellow: Both have UV maps. The cube has a boolean difference modifier with the plane.
Violet: As Yellow, after applying the modifier. In 2.80 and 2.79 it has the expected UV map, but in 2.79 it has an extra zero UV map.

boolUVbug279b.blend

boolUVbug280.blend

**System Information** Operating system: OSX Mojave (10.14.2) Graphics card: NVIDIA GeForce GTX 780M 4096 MB **Blender Version** Broken: 2.80 Beta, 4dd0a90f4213, 2019-01-01 Broken (but differently) 2.79, 111179beb0b1, 2018-12-27, and the 2.79b release. **Short description of error** Applying a boolean modifier can cause a UV map to be deleted in 2.80, or an extra one to be added in 2.79, depending on whether one of the arguments has a UV map. When I use a boolean difference operator to transform a shape A into A-B: If A has a UV map and B does not, then in 2.80, A-B has no UV map. In 2.79 it works as expected: A-B has a single UV map that maps faces descending from A in the natural way and faces descending from B to (0,0). If A and B both have UV maps then in 2.80 this works as expected: the new object has a single UV map computed in the natural way from those of A and B. In 2.79, the result also has the expected UV map, but it acquires a second UV map that maps every face to (0,0). **Exact steps for others to reproduce the error** The attached .blend files illustrate this, one for 2.79 and one for 2.80. Both files contain the same objects. The colours are for identification of parts. Red: Cube has UV map, plane does not. The cube has a boolean difference modifier with the plane. Green: As Red, after applying modifier. In 2.80, the cube has no UV map. In 2.79, it has the expected UV map. Yellow: Both have UV maps. The cube has a boolean difference modifier with the plane. Violet: As Yellow, after applying the modifier. In 2.80 and 2.79 it has the expected UV map, but in 2.79 it has an extra zero UV map. [boolUVbug279b.blend](https://archive.blender.org/developer/F6151603/boolUVbug279b.blend) [boolUVbug280.blend](https://archive.blender.org/developer/F6151605/boolUVbug280.blend)

Richard Kennaway commented

2019-01-02 16:40:57 +01:00

Added subscriber: @RichardKennaway

Sebastian Parborg commented

2019-01-02 18:07:04 +01:00

Closed as duplicate of #59304

Sebastian Parborg closed this issue

2019-01-02 18:07:04 +01:00

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Applying a boolean modifier can delete UV maps or add empty ones #60076