Maya - Select all instance objects in a scene.

sculptn

Just wondering how to - Select all instanced objects in a scene.

Thanks 

sculptn

I tried this seemed like it could give you a list of all the instances but could not get it to work. 

http://lesterbanks.com/2010/06/uninstance-all-instances-in-maya/

pasha_sevez

This will select all instances of selected object

string $sel[] = `ls -sl`;
string $shapes[] = `listRelatives -s $sel[0]`;
select `listRelatives -ap $shapes[0]`;

pasha_sevez

sculptn said:

I tried this seemed like it could give you a list of all the instances but could not get it to work. 

http://lesterbanks.com/2010/06/uninstance-all-instances-in-maya/

This page shows code with broken formatting. This code is pretty neat and works well too. To use it - run this corrected Python code:

# Python code

import maya.cmds as mc

import maya.OpenMaya as om

def getInstances():

    instances = []

    iterDag = om.MItDag(om.MItDag.kBreadthFirst)

    while not iterDag.isDone():

        instanced = om.MItDag.isInstanced(iterDag)

        if instanced:

            instances.append(iterDag.fullPathName())

        iterDag.next()

    return instances

def uninstance():

    instances = getInstances()

    while len(instances):

        parent = mc.listRelatives(instances[0], parent=True)[0]

        mc.duplicate(parent, renameChildren=True)

        mc.delete(parent)

        instances = getInstances()

uninstance()

sculptn

Thanks for fixing that pasha_sevez That script seems to Uninstance all the instances in a scene very handy but I what i want to do select all instances in a scene or get a list of them. If that makes sense ? Not sure if that's really possible though.

Axi5

Just call mc.select(getInstances()) instead, you don't need the uninstance function. Like so:

import maya.cmds as mc
import maya.OpenMaya as om

def getInstances():
    instances = []
    iterDag = om.MItDag(om.MItDag.kBreadthFirst)
    while not iterDag.isDone():
        instanced = om.MItDag.isInstanced(iterDag)
        if instanced:
            instances.append(iterDag.fullPathName())
        iterDag.next()
    return instances
    
    
mc.select(getInstances())

pasha_sevez

Axi5 said:

Just call mc.select(getInstances()) instead, you don't need the uninstance function. 

Yup, forgot to mention ) Just fixed the code from the link above )) Btw, really handy code, saved it for myself too. It finds ALL instances and tries to make them copies instead. 

sculptn said:

Thanks for fixing that pasha_sevez That script seems to Uninstance all the instances in a scene very handy but I what i want to do select all instances in a scene or get a list of them. If that makes sense ? Not sure if that's really possible though.

As @Axi5 said, just use getInstances() - but adjust the usage a bit:

list( set( mc.listRelatives( getInstances(), ap=1 ) ) )

That's because getInstances() returns you a list of shapes, not transforms.

pasha_sevez

I've tweaked the procedure to print transforms directly, here it is:

import maya.api.OpenMaya as om
def getInstances():
	instances = []
	iterDag = om.MItDag(om.MItDag.kBreadthFirst)
	while not iterDag.isDone():
		instanced = om.MItDag.isInstanced(iterDag)
		if instanced:
			transformFn = om.MFnTransform()
			transformFn.setObject( iterDag.getPath().transform() )
			instances.append( transformFn.fullPathName() )
		iterDag.next()
	return instances

print getInstances()

sculptn

That's great guys thanks for the help pasha_sevez, Axi5

morrisolmsted

1. import maya.api.OpenMaya as om
2. def getInstances():
3. instances = []
4. iterDag = om.MItDag(om.MItDag.kBreadthFirst)
5. while not iterDag.isDone():
6. instanced = om.MItDag.isInstanced(iterDag)
7. if instanced:
8. transformFn = om.MFnTransform()
9. transformFn.setObject( iterDag.getPath().transform() )
10. instances.append( transformFn.fullPathName() )
11. iterDag.next()
12. return instances
13.  
14. list( set( mc.listRelatives( getInstances(), ap=1 ) ) )

When I use this, I only get this error...<bound method Instance_Tools.getInstances of <instanceTools.Instance_Tools object at 0x000002279E3FE888>>

any idea why?