World Standart of Parenting #79225

New Issue

Roman · 2020-07-24T11:51:50+02:00

Roman commented

2020-07-24 11:51:50 +02:00

This is a design task for changing parenting method.

Description of the problem of the existing method
https://blender.community/c/rightclickselect/fJdbbc/

Solution: calculate coordinates using the following formulas

[world position object-Parent] - [world position object-Child] = Child_position
[world rotaion object-Parent] - [world rotaion object-Child] = Child_rotaion
[world scale object-Child] / [world scale object-Parent] = Child_scale

This is a design task for changing parenting method. Description of the problem of the existing method https://blender.community/c/rightclickselect/fJdbbc/ Solution: calculate coordinates using the following formulas [world position object-Parent] - [world position object-Child] = Child_position [world rotaion object-Parent] - [world rotaion object-Child] = Child_rotaion [world scale object-Child] / [world scale object-Parent] = Child_scale

Roman commented

2020-07-24 11:51:50 +02:00

Added subscriber: @roman-13

Demeter Dzadik commented

2020-07-24 13:10:46 +02:00

Added subscriber: @Mets

Demeter Dzadik commented

2020-07-24 13:10:46 +02:00

This took a bit of effort to understand, but I think juliensoler's comment in that thread is hitting the nail on the head:

IMHO, Blender lacks of two operations:

in Ctrl-P menu : a "Object (without inverse, keep transform)" which parent, clear parent inverse and leave the object in place

in Alt-P menu: "Clear parent inverse (keep transform)" which clear parent inverse and leave the object in place I guess those operations does not exist because it will not work if child have rotation and parent non uniform scale (I think, not really sure). But it worth it anyway. If the operation does not do what you expected, you still have Ctrl-Z...

This can be done with a few lines of Python, just slap this in a text editor and try it:

import bpy
from mathutils import Matrix

act = bpy.context.active_object
# Parent selected objects to active, empty the inverse matrix and preserve the world matrix.
for o in bpy.context.selected_objects:
	if o==act: continue
	mat_world = o.matrix_world.copy()
	o.parent_type = 'OBJECT'
	o.parent = act
	o.matrix_parent_inverse = Matrix.Identity(4)
	o.matrix_world = mat_world

I'm not sure if this topic belongs here yet, so be warned a developer very well might close this (design tasks are usually created on developer's approval, or by the developer who will implement the design themselves)
As for the question of whether this should be a part of Blender, I have no strong opinion, It does seem useful!

This took a bit of effort to understand, but I think juliensoler's comment in that thread is hitting the nail on the head: >IMHO, Blender lacks of two operations: >- in Ctrl-P menu : a "Object (without inverse, keep transform)" which parent, clear parent inverse and leave the object in place >- in Alt-P menu: "Clear parent inverse (keep transform)" which clear parent inverse and leave the object in place I guess those operations does not exist because it will not work if child have rotation and parent non uniform scale (I think, not really sure). But it worth it anyway. If the operation does not do what you expected, you still have Ctrl-Z... This can be done with a few lines of Python, just slap this in a text editor and try it: ``` import bpy from mathutils import Matrix act = bpy.context.active_object # Parent selected objects to active, empty the inverse matrix and preserve the world matrix. for o in bpy.context.selected_objects: if o==act: continue mat_world = o.matrix_world.copy() o.parent_type = 'OBJECT' o.parent = act o.matrix_parent_inverse = Matrix.Identity(4) o.matrix_world = mat_world ``` I'm not sure if this topic belongs here yet, so be warned a developer very well might close this (design tasks are usually created on developer's approval, or by the developer who will implement the design themselves) As for the question of whether this should be a part of Blender, I have no strong opinion, It does seem useful!

Roman commented

2020-07-24 13:25:08 +02:00

@Mets Thank you! This is exactly what need!
Мany artists suffer without this feature!
It remains to embed this in the blender.

@Mets Thank you! This is exactly what need! Мany artists suffer without this feature! It remains to embed this in the blender.

Philip Holzmann commented

2020-07-27 14:23:58 +02:00

Added subscriber: @Foaly

Philip Holzmann commented

2020-07-27 14:23:58 +02:00

@Mets @roman-13
Keep in mind that this will not work with Curve objects, since they have another hidden matrix that the python api does not take care of.
(E.g. doing o.matrix_world = o.matrix_world will also move an object, rather than doing nothing.)

Perhaps a redesign for these things is due anyway?

@Mets @roman-13 Keep in mind that this will not work with Curve objects, since they have another hidden matrix that the python api does not take care of. (E.g. doing `o.matrix_world = o.matrix_world` will also move an object, rather than doing nothing.) Perhaps a redesign for these things is due anyway?

Brecht Van Lommel commented

2020-07-27 14:41:38 +02:00

Added subscriber: @brecht

Brecht Van Lommel commented

2020-07-27 14:41:38 +02:00

Changed status from 'Needs Triage' to: 'Archived'

Brecht Van Lommel closed this issue

2020-07-27 14:41:38 +02:00

Brecht Van Lommel self-assigned this 2020-07-27 14:41:38 +02:00

Brecht Van Lommel commented

2020-07-27 14:41:38 +02:00

Design tasks should only be created by developers that will implement the feature or maintain the module. Please see here for where to post such requests or design ideas:
https://wiki.blender.org/wiki/Communication/Contact#User_Feedback_and_Requests

Design tasks should only be created by developers that will implement the feature or maintain the module. Please see here for where to post such requests or design ideas: https://wiki.blender.org/wiki/Communication/Contact#User_Feedback_and_Requests

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World Standart of Parenting #79225