Python mesh.from_pydata() without faces won't show mesh until in/out edit mode #57366

New Issue

Dalai Felinto · 2018-10-24T00:49:32+02:00

Dalai Felinto commented

2018-10-24 00:49:32 +02:00

Blender Version
Broken: ed7f6b511f81 (blender2.8 HEAD)
Worked: 2.79a

Short description of error
Meshes created with Python, and the mesh.from_pydata() function are "invisible" until we go in and out of edit mode.
The data seems valid though, since the object Dimensions is correct even when the mesh is invisible.

Exact steps for others to reproduce the error
Run the following script in the Text editor. In 2.79 it works fine. In 2.8 you have to toggle in and out of edit mode to see the mesh.

Maybe the issue is only that the API changed. If that's the case we need to update the release notes .

import bpy

# Create mesh object
mesh = bpy.data.meshes.new("Malha")
obj = bpy.data.objects.new("Objeto", mesh)

if hasattr(bpy.context, "collection"):
    # Blender 2.8
    bpy.context.collection.objects.link(obj)
    bpy.context.view_layer.objects.active = obj
    obj.select_set('SELECT')
else:
    # Blender 2.7x
    bpy.context.scene.objects.link(obj)
    bpy.context.scene.objects.active = obj
    obj.select = True

verts = [(0.8, 0.2, 0.0), (0.5, 0.6, 0.0), (0.3, 0.3, 0.0)]
edges = [(0, 1), (1, 2), (2, 0)]
faces = []
#faces = [(0, 1, 2)]

mesh = obj.data
mesh.from_pydata(verts, edges, faces)
mesh.update()

For a more interesting mesh use:

verts = [(0.7071067690849304, 0.7071067690849304, 0.0), (0.7071067690849304, -0.7071067690849304, 0.0), (-0.7071067690849304, 0.7071067690849304, 0.0), (-0.7071067690849304, -0.7071067690849304, 0.0), (0.8314696550369263, 0.5555701851844788, 0.0), (0.8314696550369263, -0.5555701851844788, 0.0), (-0.8314696550369263, 0.5555701851844788, 0.0), (-0.8314696550369263, -0.5555701851844788, 0.0), (0.9238795042037964, 0.3826834261417389, 0.0), (0.9238795042037964, -0.3826834261417389, 0.0), (-0.9238795042037964, 0.3826834261417389, 0.0), (-0.9238795042037964, -0.3826834261417389, 0.0), (0.9807852506637573, 0.19509035348892212, 0.0), (0.9807852506637573, -0.19509035348892212, 0.0), (-0.9807852506637573, 0.19509035348892212, 0.0), (-0.9807852506637573, -0.19509035348892212, 0.0), (0.19509197771549225, 0.9807849526405334, 0.0), (0.19509197771549225, -0.9807849526405334, 0.0), (-0.19509197771549225, 0.9807849526405334, 0.0), (-0.19509197771549225, -0.9807849526405334, 0.0), (0.3826850652694702, 0.9238788485527039, 0.0), (0.3826850652694702, -0.9238788485527039, 0.0), (-0.3826850652694702, 0.9238788485527039, 0.0), (-0.3826850652694702, -0.9238788485527039, 0.0), (0.5555717945098877, 0.8314685821533203, 0.0), (0.5555717945098877, -0.8314685821533203, 0.0), (-0.5555717945098877, 0.8314685821533203, 0.0), (-0.5555717945098877, -0.8314685821533203, 0.0), (0.19509197771549225, 1.2807848453521729, 0.0), (0.19509197771549225, -1.2807848453521729, 0.0), (-0.19509197771549225, 1.2807848453521729, 0.0), (-0.19509197771549225, -1.2807848453521729, 0.0), (1.280785322189331, 0.19509035348892212, 0.0), (1.280785322189331, -0.19509035348892212, 0.0), (-1.280785322189331, 0.19509035348892212, 0.0), (-1.280785322189331, -0.19509035348892212, 0.0), (0.3950919806957245, 1.2807848453521729, 0.0), (0.3950919806957245, -1.2807848453521729, 0.0), (-0.3950919806957245, 1.2807848453521729, 0.0), (-0.3950919806957245, -1.2807848453521729, 0.0), (1.280785322189331, 0.39509034156799316, 0.0), (1.280785322189331, -0.39509034156799316, 0.0), (-1.280785322189331, 0.39509034156799316, 0.0), (-1.280785322189331, -0.39509034156799316, 0.0), (0.0, 1.5807849168777466, 0.0), (0.0, -1.5807849168777466, 0.0), (1.5807852745056152, 0.0, 0.0), (-1.5807852745056152, 0.0, 0.0)]

edges = [(0, 4), (1, 5), (2, 6), (3, 7), (4, 8), (5, 9), (6, 10), (7, 11), (8, 12), (9, 13), (10, 14), (11, 15), (16, 20), (17, 21), (18, 22), (19, 23), (20, 24), (21, 25), (22, 26), (23, 27), (0, 24), (1, 25), (2, 26), (3, 27), (16, 28), (17, 29), (18, 30), (19, 31), (12, 32), (13, 33), (14, 34), (15, 35), (28, 36), (29, 37), (30, 38), (31, 39), (32, 40), (33, 41), (34, 42), (35, 43), (36, 44), (37, 45), (38, 44), (39, 45), (40, 46), (41, 46), (42, 47), (43, 47)]

**Blender Version** Broken: ed7f6b511f81 (blender2.8 HEAD) Worked: 2.79a **Short description of error** Meshes created with Python, and the `mesh.from_pydata()` function are "invisible" until we go in and out of edit mode. The data seems valid though, since the object Dimensions is correct even when the mesh is invisible. **Exact steps for others to reproduce the error** Run the following script in the Text editor. In 2.79 it works fine. In 2.8 you have to toggle in and out of edit mode to see the mesh. Maybe the issue is only that the API changed. If that's the case we need to update the [release notes ](https://wiki.blender.org/wiki/Reference/Release_Notes/2.80/Python_API). ``` import bpy # Create mesh object mesh = bpy.data.meshes.new("Malha") obj = bpy.data.objects.new("Objeto", mesh) if hasattr(bpy.context, "collection"): # Blender 2.8 bpy.context.collection.objects.link(obj) bpy.context.view_layer.objects.active = obj obj.select_set('SELECT') else: # Blender 2.7x bpy.context.scene.objects.link(obj) bpy.context.scene.objects.active = obj obj.select = True verts = [(0.8, 0.2, 0.0), (0.5, 0.6, 0.0), (0.3, 0.3, 0.0)] edges = [(0, 1), (1, 2), (2, 0)] faces = [] #faces = [(0, 1, 2)] mesh = obj.data mesh.from_pydata(verts, edges, faces) mesh.update() ``` For a more interesting mesh use: ``` verts = [(0.7071067690849304, 0.7071067690849304, 0.0), (0.7071067690849304, -0.7071067690849304, 0.0), (-0.7071067690849304, 0.7071067690849304, 0.0), (-0.7071067690849304, -0.7071067690849304, 0.0), (0.8314696550369263, 0.5555701851844788, 0.0), (0.8314696550369263, -0.5555701851844788, 0.0), (-0.8314696550369263, 0.5555701851844788, 0.0), (-0.8314696550369263, -0.5555701851844788, 0.0), (0.9238795042037964, 0.3826834261417389, 0.0), (0.9238795042037964, -0.3826834261417389, 0.0), (-0.9238795042037964, 0.3826834261417389, 0.0), (-0.9238795042037964, -0.3826834261417389, 0.0), (0.9807852506637573, 0.19509035348892212, 0.0), (0.9807852506637573, -0.19509035348892212, 0.0), (-0.9807852506637573, 0.19509035348892212, 0.0), (-0.9807852506637573, -0.19509035348892212, 0.0), (0.19509197771549225, 0.9807849526405334, 0.0), (0.19509197771549225, -0.9807849526405334, 0.0), (-0.19509197771549225, 0.9807849526405334, 0.0), (-0.19509197771549225, -0.9807849526405334, 0.0), (0.3826850652694702, 0.9238788485527039, 0.0), (0.3826850652694702, -0.9238788485527039, 0.0), (-0.3826850652694702, 0.9238788485527039, 0.0), (-0.3826850652694702, -0.9238788485527039, 0.0), (0.5555717945098877, 0.8314685821533203, 0.0), (0.5555717945098877, -0.8314685821533203, 0.0), (-0.5555717945098877, 0.8314685821533203, 0.0), (-0.5555717945098877, -0.8314685821533203, 0.0), (0.19509197771549225, 1.2807848453521729, 0.0), (0.19509197771549225, -1.2807848453521729, 0.0), (-0.19509197771549225, 1.2807848453521729, 0.0), (-0.19509197771549225, -1.2807848453521729, 0.0), (1.280785322189331, 0.19509035348892212, 0.0), (1.280785322189331, -0.19509035348892212, 0.0), (-1.280785322189331, 0.19509035348892212, 0.0), (-1.280785322189331, -0.19509035348892212, 0.0), (0.3950919806957245, 1.2807848453521729, 0.0), (0.3950919806957245, -1.2807848453521729, 0.0), (-0.3950919806957245, 1.2807848453521729, 0.0), (-0.3950919806957245, -1.2807848453521729, 0.0), (1.280785322189331, 0.39509034156799316, 0.0), (1.280785322189331, -0.39509034156799316, 0.0), (-1.280785322189331, 0.39509034156799316, 0.0), (-1.280785322189331, -0.39509034156799316, 0.0), (0.0, 1.5807849168777466, 0.0), (0.0, -1.5807849168777466, 0.0), (1.5807852745056152, 0.0, 0.0), (-1.5807852745056152, 0.0, 0.0)] edges = [(0, 4), (1, 5), (2, 6), (3, 7), (4, 8), (5, 9), (6, 10), (7, 11), (8, 12), (9, 13), (10, 14), (11, 15), (16, 20), (17, 21), (18, 22), (19, 23), (20, 24), (21, 25), (22, 26), (23, 27), (0, 24), (1, 25), (2, 26), (3, 27), (16, 28), (17, 29), (18, 30), (19, 31), (12, 32), (13, 33), (14, 34), (15, 35), (28, 36), (29, 37), (30, 38), (31, 39), (32, 40), (33, 41), (34, 42), (35, 43), (36, 44), (37, 45), (38, 44), (39, 45), (40, 46), (41, 46), (42, 47), (43, 47)] ```

Dalai Felinto commented

2018-10-24 00:49:32 +02:00

Added subscriber: @dfelinto

Campbell Barton was assigned by Dalai Felinto

2018-10-24 00:51:02 +02:00

Dalai Felinto commented

2018-10-24 00:51:02 +02:00

Added subscribers: @fclem, @ideasman42

Dalai Felinto commented

2018-10-24 00:51:02 +02:00

Assigning to @ideasman42 but I suspect the issue may be the drawing caches, so poking @fclem as well.

Dalai Felinto commented

2018-10-24 01:08:00 +02:00

And if you want a "production" example of this:

Enable the Rigify addon.
Add > Armature > Human (Meta-Rig).
In the Armature tab > Generate Rig (and wait, it takes some time).

To fix the file turn the Widgets collection visible, select all objects and toggle in and out of edit mesh mode (multi-objects never came so handy).

And if you want a "production" example of this: * Enable the Rigify addon. * Add > Armature > Human (Meta-Rig). * In the Armature tab > Generate Rig (and wait, it takes some time). To fix the file turn the Widgets collection visible, select all objects and toggle in and out of edit mesh mode (multi-objects never came so handy).

blender-admin commented

2018-10-24 02:37:44 +02:00

This issue was referenced by blender/blender@901ccfab52

This issue was referenced by blender/blender@901ccfab52ada8e46a61c1dce56fa43c291fb935

Campbell Barton commented

2018-10-24 02:41:17 +02:00

Changed status from 'Open' to: 'Resolved'

Campbell Barton closed this issue

2018-10-24 02:41:17 +02:00

Dalai Felinto commented

2018-10-24 03:26:17 +02:00

Thank you, rigify working fine now, assign from some:
//source/blender/blenkernel/intern/cdderivedmesh.c:157:2: runtime error: null pointer passed as argument 1, which is declared to never be null

Thank you, rigify working fine now, assign from some: `//source/blender/blenkernel/intern/cdderivedmesh.c:157:2: runtime error: null pointer passed as argument 1, which is declared to never be null`

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Python mesh.from_pydata() without faces won't show mesh until in/out edit mode #57366