[3dsmax][pymxs] Get the object's position constraint's target and weight?

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#1

Hi,

I’m trying to retrieve an object’s position constraint’s target and weight. See below for illustration.
How is this possible in pymxs? I tried using the “help” function but it returns an error

import pymxs
rt = pymxs.runtime

obj_list = rt.selection

for obj in obj_list: 
    # help function to get the possible properties and methods
    # but this returns an error instead.
    print (help(obj)) 

    break

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#2

I tried using

obj.position.controller but it returns None even though there is a constraint attached.

#3

You can’t get access to the objects controller directly using pymsx.
You have to use the objects getattr method if I remember correctly.

node.postition.gettettr("controller")
#4

Thanks for the response.
Swordslayer from Reddit helped arrived with the working code:

import pymxs
rt = pymxs.runtime

obj = rt.selection[0]
transformCtrl = rt.getSubAnim(obj, 'transform').controller
posCtrl = rt.getSubAnim(transformCtrl, 'position')
print (posCtrl[1].controller.weight[0] )

My bottleneck is retrieving the name/target of the weight (i.e. the object it was weighted)
I tried using
posCtrl[1].controller.name[0] or
posCtrl[1].controller.target[0]

but it doesn’t work :frowning:

#5

Here is the docs for position constraint:
https://help.autodesk.com/view/MAXDEV/2022/ENU/?guid=GUID-4F0CBB0A-28B1-4182-8164-2BB730C86D06

getNumTargets()
getNode <index>
getWeight <index>

are what you want

1 Like
#6

This gets the weight of the controller in the controller stack rather than weights of attributes specific to the controller type

#7

@Munkybutt

Thanks for the response.
the getNode(), getWeight() and `getNumTargets)
works as expected!

Thanks for linking the doc. I searched it earler but I just couldn’t find where it belong.
I’m really reliant on the help() method in every API.

#8

yeah pymxs just wraps the maxscript api so all the info is in the maxscript docs.