Basic Python Question

[Will Sharkey]

Hi, 

I've been picking up python recently and while doing a mundane task in Maya, I decided to quickly write a script for practice. Then I got really into it and looked up how to make a basic menu!!

I noticed a snag in my script. I'm simply changing the .overrideColor on the shape, but I noticed my script doesnt work it the shapes are not named the same, its not a big deal but I'd love to know the answer.:

import maya.cmds as mc

def redWireColour():

    selection = mc.ls( selection=True )

    for i in range (len (selection)): 

        mc.setAttr( selection[i] + '|curveShape.overrideEnabled', 1 )

        mc.setAttr( selection[i] + '|curveShape.overrideColor', 4 )

    

So the name 'curveShape' is hardcoded, which isnt good. How would one look up the shape name of the object and add it to the '.overrideEnabled'? 

Thanks in advance

[Chris Gardner]

hey will,

here's a function to get the shape of a node (it looks complicated because it's been severely battle tested over the years)

def getShape(node):
    """
    Finds the shape node from a transform

    @param node: Object
    @type node: String

    @return: Shape node
    """
    if 'transform' in cmds.nodeType(node, inherited=True):
        if cmds.listRelatives(node, shapes=True):
            shapes = [x for x in cmds.listRelatives(node, shapes=True, fullPath=True)
                      if cmds.getAttr(x + '.intermediateObject') is False]
            if not shapes:
                return None
            return shapes[0]
        else:
            return None
    elif 'shape' in cmds.nodeType(node, inherited=True):
        return node

so then you could

def redWireColour():
    selection = mc.ls( selection=True )


    for i in selection:
        selShape = getShape(i)
        mc.setAttr( selShape + '.overrideEnabled', 1 )
        mc.setAttr( selShape + '.overrideColor', 4 )

btw, in python you don't need to loop over the selection by an index - you can just loop directly. saves some legwork.

cheers,
chrisg

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[Chris Gardner]

oh, sorry, you might need to replace the "cmds' in my function with "mc" - i use

import maya.cmds as cmds

where you obviously import it as "mc"

cheers,
chrisg

[Will Sharkey]

thanks, that works perfectly. I dont quite understand all aspects of the function but I'm sure I will in a month or two. 

Interesting stuff, thanks again.

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[AK Eric]

Optionally you can cut out a lot of cruft using PyMel:

def redWireColour():

    sel = pm.ls(selection=True)

    for item in sel:

        item.overrideEnabled.set(1)

        item.overrideColor.set(4)

One of the nice things it does is, if it can't find an attr on the transform, it'll auto look to the shape.

[AK Eric]

d'oh, I forgot the :

import pymel.core as pm

part... ;)

[Will Sharkey]

Hi,  I have some simple code that I'm trying to return the value for a floatSliderGrp but Im not sure why is failing. Any pointers for what Im doing wrong?

import maya.cmds as cmds

def intensity_value(*args): 

    selection = cmds.ls( selection=True )

    intValue = cmds.floatSliderGrp('Intensity', query=True, value=True)

    for sel in selection:

        cmds.setAttr('{0}.intensity'.format(sel),intValue) 

def exposure_value(*args): 

    selection = cmds.ls( selection=True )

    expoValue = cmds.floatSliderGrp('Exposure', query=True, value=True)

    for sel in selection:

        cmds.setAttr('{0}.aiExposure'.format(sel),expoValue)

def myWindow():

    if cmds.window('ws_lightParameter', exists = True):

       cmds.deleteUI('ws_lightParameter')

       

    cmds.window('ws_lightParameter')

    cmds.columnLayout() 

    cmds.floatSliderGrp(label='Intensity', field=True, maxValue=50.0, value=0, cc= intensity_value) 

    cmds.floatSliderGrp(label='Exposure', field=True, maxValue=50.0, value=0, cc= exposure_value) 

    cmds.showWindow('ws_lightParameter')

myWindow()

thanks!

[damon shelton]

You need to make your slider group intensity you are just setting the labels. Put intensity without a flag right after the (   when you create the slider grp

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[Will Sharkey]

got it, thanks for the help.

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[Justin Israel]

You also might want to save the actual returned full path name of the float slider group in a variable and use that, instead of a literal string, when you look up the values. Those queries basically ask the entire Maya application for a control named "intensity". So if something else happens to have created a control named that, you may end up querying the wrong one. But the name returned from the control is the unique full name.

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[Will Sharkey]

I was just having another look at a piece of code I wrote for changing certain light parameters. 

When I run the code, Id love to be able to read that current value, then punch it in the respective field. It would also be cool if the UI Window refreshed on light selection, but that might be getting to fancy for my python skills!

Here's the code, appreciate any pointers :)

import maya.cmds as cmds

def intensity_value(colour_control): 

    selection = cmds.ls( selection=True )

    for sel in selection:

        cmds.setAttr('{0}.intensity'.format(sel),colour_control) 

def exposure_value(exposure_control): 

    selection = cmds.ls( selection=True )

    for sel in selection:

        cmds.setAttr('{0}.aiExposure'.format(sel),exposure_control)

def sample_value(sample_control): 

    selection = cmds.ls( selection=True )

    for sel in selection:

        cmds.setAttr('{0}.aiSamples'.format(sel),sample_control)

def myWindow():

    if cmds.window('ws_lightParameter', exists = True):

       cmds.deleteUI('ws_lightParameter')

       

    cmds.window('ws_lightParameter')

    cmds.columnLayout() 

    colour_control = cmds.floatSliderGrp(label='Intensity', field=True, maxValue=50.0, value=1, cc= intensity_value) 

    exposure_control = cmds.floatSliderGrp(label='Exposure', field=True, maxValue=50.0, value=0, cc= exposure_value)

    sample_control = cmds.intSliderGrp(label='Samples', field=True, minValue=1, maxValue=50.0, value=1, cc= sample_value)  

    cmds.showWindow('ws_lightParameter')

myWindow()

[Justin Israel]

If this were a class, you would save those full path values from creating your controls, as member attributes, so that you could reference them again when you want to use the "edit" mode on the control commands to set a value.
In your case, you would have to use the "global" keyword to save them to global scope variables.

For following selection, that would require either a ScripJob, or directly through the Maya API callback messages. You would also have to handle the case of ambiguous values when you select 2 or more lights, if they have different values.

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[Will Sharkey]

So, I know a couple of phrases in python, but I don't know how to string sentences. I just purchased a couple of tutorial bundles, I'll check back when I have a better structure for learning.

thanks for the help :)

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[Will Sharkey]

i just realised that you are in fact the author of these tutorials!

Well played :D

[Justin Israel]

On Wed, 26 Aug 2015 3:24 AM Will Sharkey <willjs...@gmail.com> wrote:

i just realised that you are in fact the author of these tutorials!

Well played :D

:-)

Thanks for snagging them.

On Tuesday, August 25, 2015 at 10:03:42 AM UTC-4, Will Sharkey wrote:

So, I know a couple of phrases in python, but I don't know how to string sentences. I just purchased a couple of tutorial bundles, I'll check back when I have a better structure for learning.

thanks for the help :)

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