blender python addon: unexpected result of object join #62494

New Issue

Wim den Boer · 2019-03-12T15:15:56+01:00

Wim den Boer commented

2019-03-12 15:15:56 +01:00

System Information
Operating system: MacOS 10.13.6
Graphics card: Geforce GT1030

Blender Version
Broken: 2.80, hash: e6eb7b9cce, type: Release build date: 2019-03-12, 01:51:49
Worked: 2.79b

Use of bpy.ops.object.join() in addon script gives an unexpected result

The upload file contains a simplified addon to demonstrate the problem, two screen dumps and a simple blend file

Steps:

Install addon Testbed
Open test_object_join.blend
Click Testbed button in 3D-header
Tweak scale property in operator panel

Result after step 3 is a cube with 5 unconnected meshes with proper location and scale. (screenshot "default scale.png")
Result after step 4 is a cube with 5 unconnected meshes all with the original object location and scale. (screenshot "with scale setting.png")

The step 3 result is what you expect with and without tweaking the scale property. Is is the result you get in 2.79b and when skipping the bpy.ops.object.join() in the script and joining "by hand".

test object join.zip

**System Information** Operating system: MacOS 10.13.6 Graphics card: Geforce GT1030 **Blender Version** Broken: 2.80, hash: e6eb7b9ccee1, type: Release build date: 2019-03-12, 01:51:49 Worked: 2.79b Use of bpy.ops.object.join() in addon script gives an unexpected result The upload file contains a simplified addon to demonstrate the problem, two screen dumps and a simple blend file Steps: 1. Install addon Testbed 2. Open test_object_join.blend 3. Click Testbed button in 3D-header 4. Tweak scale property in operator panel Result after step 3 is a cube with 5 unconnected meshes with proper location and scale. (screenshot "default scale.png") Result after step 4 is a cube with 5 unconnected meshes all with the original object location and scale. (screenshot "with scale setting.png") The step 3 result is what you expect with and without tweaking the scale property. Is is the result you get in 2.79b and when skipping the bpy.ops.object.join() in the script and joining "by hand". [test object join.zip](https://archive.blender.org/developer/F6810175/test_object_join.zip)

Wim den Boer commented

2019-03-12 15:15:56 +01:00

Added subscriber: @WimdenBoer

Jacques Lucke commented

2019-03-13 13:00:15 +01:00

Added subscriber: @JacquesLucke

Campbell Barton was assigned by Jacques Lucke

2019-03-13 13:00:16 +01:00

Jacques Lucke commented

2019-03-13 13:00:16 +01:00

This is probably an undo issue.

lang=python
import bpy
from bpy.props import FloatProperty

def copyObject(loc, scale, object):
    newobject = bpy.data.objects.new(object.name, object.data.copy())
    newobject.scale *= scale
    newobject.location = loc
    return newobject

class TestOperator(bpy.types.Operator):
    bl_idname = "test.test"
    bl_label = "Test"
    bl_options = {'REGISTER', 'UNDO'}
    
    scale: FloatProperty(default=0.1)
    
    def execute(self, context):
        obj = context.view_layer.objects.active
        for i in range(1,5):
            newobj = copyObject((2*i,0,0), self.scale, obj)
            context.scene.collection.objects.link(newobj)
            newobj.select_set(True)
        bpy.ops.object.join()
        return {'FINISHED'} 
    
bpy.utils.register_class(TestOperator)

This is probably an undo issue. ``` lang=python import bpy from bpy.props import FloatProperty def copyObject(loc, scale, object): newobject = bpy.data.objects.new(object.name, object.data.copy()) newobject.scale *= scale newobject.location = loc return newobject class TestOperator(bpy.types.Operator): bl_idname = "test.test" bl_label = "Test" bl_options = {'REGISTER', 'UNDO'} scale: FloatProperty(default=0.1) def execute(self, context): obj = context.view_layer.objects.active for i in range(1,5): newobj = copyObject((2*i,0,0), self.scale, obj) context.scene.collection.objects.link(newobj) newobj.select_set(True) bpy.ops.object.join() return {'FINISHED'} bpy.utils.register_class(TestOperator) ``` ![undo issue.gif](https://archive.blender.org/developer/F6814116/undo_issue.gif)

Sebastian Parborg commented

2019-03-13 13:35:36 +01:00

Added subscriber: @ZedDB

Sebastian Parborg commented

2019-03-13 13:35:36 +01:00

I'll mark this as confirmed then.

Campbell Barton was unassigned by Dalai Felinto

2019-12-23 16:34:53 +01:00

Dalai Felinto commented

2019-12-23 16:34:53 +01:00

Added subscriber: @ideasman42

Wim den Boer commented

2020-01-07 20:59:03 +01:00

Changed status from 'Confirmed' to: 'Resolved'

Wim den Boer closed this issue

2020-01-07 20:59:03 +01:00

Wim den Boer self-assigned this 2020-01-07 20:59:03 +01:00

Wim den Boer commented

2020-01-07 20:59:03 +01:00

Retested this issue with 2.81a:

version: 2.81 (sub 16), branch: master, commit date: 2019-12-04 11:32, hash: f1aa4d18d4

bpy.ops.object.join() worked as expected.

I have changed the status to resolved.

My little contribution to the tracker curfew :)

Thanks

Retested this issue with 2.81a: version: 2.81 (sub 16), branch: master, commit date: 2019-12-04 11:32, hash: f1aa4d18d49d bpy.ops.object.join() worked as expected. I have changed the status to resolved. My little contribution to the tracker curfew :) Thanks

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blender python addon: unexpected result of object join #62494