My problem is that I have a scene with many objects , which are grouped into EMPTY, I need to take all of the objects in the parent (EMPTY) and unite them into a single object , if you do it manually, it takes a lot of time
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$\begingroup$ Can't you just select them all and hit Ctrl+J in Object Mode? $\endgroup$Cubit– Cubit2015-12-20 13:04:11 +00:00Commented Dec 20, 2015 at 13:04
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$\begingroup$ Yes I can, but it will take a very long time , about an hour for one scene , such scenes have a lot of $\endgroup$Lev– Lev2015-12-20 13:06:29 +00:00Commented Dec 20, 2015 at 13:06
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$\begingroup$ I work in the project company , and we are developing a 3D model of the plant , import the model into a blender , and ultimately have a huge number of objects and groups , only about 10,000 teams and 600,000 objects $\endgroup$Lev– Lev2015-12-20 13:09:49 +00:00Commented Dec 20, 2015 at 13:09
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1 Answer
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Here's the pseudo code:
make sure nothing is selected to start off.
for every empty that has children:
1. select all children of the empty
2. set first child to active_object (or any child)
3. invoke a bpy.ops.join
4. deselect everything
Because you can't join anything to an Empty, You have to programmatically set a Mesh Object to be the Active Object then join other selected mesh objects to it.
Here's the python:
import bpy
# get the list of empties that have children
empties = [e for e in bpy.data.objects if e.type == 'EMPTY' and e.children]
# we need to deselect everything first
bpy.ops.object.select_all(action='DESELECT')
for empty in empties:
for obj in empty.children:
obj.select = True
joiner = empty.children[0]
bpy.context.scene.objects.active = joiner
bpy.ops.object.join()
# deselect everything before the next iteration
bpy.ops.object.select_all(action='DESELECT')
