BMesh.loops provides no access to data #48258

New Issue

Alex Fraser · 2016-04-24T15:09:58+02:00

Alex Fraser commented

2016-04-24 15:09:58 +02:00

System Information
Debian Jessie, Intel Corporation 4th Gen Core Processor Integrated Graphics Controller

Blender Version
Broken: 2.77a abf6f08

Short description of error
Unlike BMesh.verts, BMesh.edges and BMesh.faces, BMesh.loops provides no access to data - only custom data layer keys. Also the docs say "This meshes face sequence (read-only)."

Suggestion: either make BMLoopSeq iterable, or update docs to say it's not allowed.

Exact steps for others to reproduce the error

Open default blend file
Run this in the console:

import bmesh
bm = bmesh.new()
bm.from_mesh(C.object.data)
for loop in bm.loops:
     pass

TypeError: 'BMLoopSeq' object is not iterable

bm.loops[0]

TypeError: 'BMLoopSeq' object is not subscriptable

Workaround

Iterate over this sequence instead:

loops = (l for f in bm.faces for l in f.loops)

**System Information** Debian Jessie, Intel Corporation 4th Gen Core Processor Integrated Graphics Controller **Blender Version** Broken: 2.77a abf6f08 **Short description of error** Unlike `BMesh.verts`, `BMesh.edges` and `BMesh.faces`, [`BMesh.loops` ](https://www.blender.org/api/blender_python_api_2_77_0/bmesh.types.html#bmesh.types.BMesh.loops) provides no access to data - only custom data layer keys. Also the docs say "This meshes face sequence (read-only)." Suggestion: either make `BMLoopSeq` iterable, or update docs to say it's not allowed. **Exact steps for others to reproduce the error** 1. Open default blend file 2. Run this in the console: ``` import bmesh bm = bmesh.new() bm.from_mesh(C.object.data) for loop in bm.loops: pass ``` `TypeError: 'BMLoopSeq' object is not iterable` ``` bm.loops[0] ``` `TypeError: 'BMLoopSeq' object is not subscriptable` **Workaround** Iterate over this sequence instead: ``` loops = (l for f in bm.faces for l in f.loops) ```

Alex Fraser commented

2016-04-24 15:09:58 +02:00

Changed status to: 'Open'