how to Align Transform of objects without using parent constraint ?

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Virbhadra Gupta

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Jun 10, 2018, 2:37:29 PM6/10/18
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hey,

suppose i have to child objects child_01 & child_02 both are in different hierarchy.

i want to match child_02's world transform (translation & rotation) to child_01.

parent constraint is one option but do for lots of objects don't know it's a good idea or not.

Other option:

i can query child_02's world transform by xform but how can i transfer it to child_01
by it be done by matrix ??

i tried:

matrix_01 = cmds.xform("child_02", q=True, ws=True, m=True)
cmds.setAttr("child_01.worldMatrix", matrix_01, type="matrix")

but it's not working.

Fuzes Marcell

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Jun 10, 2018, 2:50:44 PM6/10/18
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You will need to multiply the Child_02 WorldMatrix by the Parent1 World Inverse Matrix to get the correct transformation in the space of Parent1
I'm not sure how to go about it in cmds you probably will have to look into OpenMaya where you have the option to multiply matrices.


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Virbhadra Gupta

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Jun 10, 2018, 2:55:55 PM6/10/18
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What if i have multiple number of parents ?
We need all parents worldinversematrix ??

Fuzes Marcell

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Jun 10, 2018, 3:04:31 PM6/10/18
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No since the WorldMatrix is already the chain multiplication of all the parents above.

You can read more about it on this blog post which explains it quite nice how it is set up in Maya and you can also try it out with nodes.

You can set up a small example in Maya and see how it works


and then add as many parents as you want it will still match the position of the object.


On 10 June 2018 at 20:55, Virbhadra Gupta <viru....@gmail.com> wrote:
What if i have multiple number of parents ?
We need all parents worldinversematrix ??
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Fuzes Marcell

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Jun 10, 2018, 3:05:32 PM6/10/18
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Sorry the names where switch this way i mean




On 10 June 2018 at 21:04, Fuzes Marcell <fuzes....@gmail.com> wrote:
No since the WorldMatrix is already the chain multiplication of all the parents above.

You can read more about it on this blog post which explains it quite nice how it is set up in Maya and you can also try it out with nodes.

You can set up a small example in Maya and see how it works


and then add as many parents as you want it will still match the position of the object.


On 10 June 2018 at 20:55, Virbhadra Gupta <viru....@gmail.com> wrote:
What if i have multiple number of parents ?
We need all parents worldinversematrix ??

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Virbhadra Gupta

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Jun 10, 2018, 3:06:43 PM6/10/18
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Thanks for you suggestion.

On Mon, Jun 11, 2018, 12:34 AM Fuzes Marcell <fuzes....@gmail.com> wrote:
No since the WorldMatrix is already the chain multiplication of all the parents above.

You can read more about it on this blog post which explains it quite nice how it is set up in Maya and you can also try it out with nodes.

You can set up a small example in Maya and see how it works


and then add as many parents as you want it will still match the position of the object.


On 10 June 2018 at 20:55, Virbhadra Gupta <viru....@gmail.com> wrote:
What if i have multiple number of parents ?
We need all parents worldinversematrix ??

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