Operation with list elements

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  08 August 2014
Operation with list elements

With for loop we get construction like:

take 1 element from list
     do operation A
repeat for next elements


How to achieve with pyMel this:

take 1 element from list
     do operation A
take 2 element from list
     do operation B
take 3 element from list
     do operation C
repeat for next elements
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  08 August 2014
You probably should read up on the basics of Python:
https://docs.python.org/2/tutorial/datastructures.html

for i in list:
  foo(i)

def foo(item):
  #do something
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  08 August 2014
>You probably should read up on the basics of Python:
Well, since its 100% true your answer does not helps too much
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Last edited by kiryha : 08 August 2014 at 01:30 PM.
 
  08 August 2014
Something like this?

ml = [1,2,3,4,5,6,7,8,9,10, 11, 12]
for l in range(0, len(ml), 6):
	value = ml[l]
	doSomethingWithOneValue(value)
	twoValueList = ml[l+1:l+3]
	doSomethingTwoOneValue(twoValueList )
 	threeValueList =  ml[l+3:l+6]
	doSomethingTwoOneValue(threeValueList )
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  08 August 2014
I would have suggested either using a dictionary or a 2nd list, even though I'm unclear what you are trying to achieve.

elementList = ['e1', 'e2', 'e3']

def opA(e):
	print 'A',e

def opB(e):
	print 'B',e

def opC(e):
	print 'C',e


# either dictionary
operators = {0:opA, 1:opB, 2:opC}
for i,element in enumerate(elementList):
	operators[i](element)


# or 2nd list
operators = [opA, opB, opC]
for op, element in zip(operators, elementList):
	op(element)


David
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  08 August 2014
Well, i think not quite.
This code
ml = [1,2,3,4,5,6,7,8,9,10, 11, 12]
for l in range(0, len(ml), 6):
	value = ml[l]
	print 'A' + str( value)
	
	twoValueList = ml[l+1:l+3]
	print 'B' + str(twoValueList)
	
 	threeValueList =  ml[l+3:l+6]
 	print 'C' + str (threeValueList)


produce

A1
B[2, 3]
C[4, 5, 6]
A7
B[8, 9]
C[10, 11, 12]


I need to get

A [1,2,3]
B [4,5,6]
C [7,8,9]
D [10, 11, 12]
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  08 August 2014
Im writing script for automatic creation of object IDs for Arnold
Here what i have working for each selected object or group i create AOV, create attribute on object, make this attribute white and feed this color to AOV.
I cant get how to build it to use 3 color instead of 1, which will reduce quantity of IDs 3 times.

import pymel.core as pm
import mtoa.aovs as aovs

# set rebder to Arnold
renderSet = pm.PyNode('defaultRenderGlobals')
renderSet.ren.set('arnold')

def checkID(*args):
    if pm.objExists('aiAOV_objectID_*'): 
        pm.select('aiAOV_objectID_*')
        exist = pm.ls(sl = True)[-1]
        exist = exist.split('_')[2]
        
        pm.select (d = True)
    else: 
        exist = 0
    return exist

def addAOV( index ): # Creates AOV render pass
    aovName = 'objectID_' + str(index)
    aovs.AOVInterface().addAOV( aovName )
    return aovName

def addColor(index): #create color attribute
    colorAttrName = 'mask_' +  str(index)
    colorAttrNameLong = 'mtoa_constant_' + str(colorAttrName)
    pm.addAttr( longName= colorAttrNameLong , niceName = colorAttrName , usedAsColor=True, attributeType='float3' )
    pm.addAttr( longName='R' +  str(colorAttrName), attributeType='float', parent=colorAttrNameLong )
    pm.addAttr( longName='G' +  str(colorAttrName), attributeType='float', parent=colorAttrNameLong )
    pm.addAttr( longName='B' +  str(colorAttrName), attributeType='float', parent=colorAttrNameLong )
    return colorAttrNameLong

def createID(index):
    # create AOV and plug aiUserDatacolor
    mskObjectMat = pm.shadingNode('aiUserDataColor', asShader=True, name = 'catchMask_' + str('%02d' % index) )
    mskObjectMat.colorAttrName.set('mask_' + str('%02d' % index))
    objectID  = addAOV ('%02d' % index)
    objectIDFull = 'aiAOV_' + str(objectID)
    ID = pm.PyNode(objectIDFull)
    mskObjectMat.outColor >> ID.defaultValue    

    
sel = pm.ls(sl = 1) #select jbject for object IDs

index = float(checkID()) + 1
for i in sel:
    createID(index)
    pm.select(i)  
    pm.runtime.SelectHierarchy()
    selShapes = pm.ls(sl = 1, shapes = True)
    pm.select(selShapes)
    msk = addColor('%02d' %index)
    
    for e in selShapes: #set mask color to white
        attr = str(e) + '.mtoa_constant_mask_' + str('%02d' % index)
        pm.setAttr(attr, [1,1,1])
           
    index += 1
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  08 August 2014
elementList = [1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17]

def opA(e):
	print 'A',e

def opB(e):
	print 'B',e

def opC(e):
	print 'C',e

operators = {0:opA, 1:opB, 2:opC}
for i,element in enumerate(elementList):
	operators[i/3%3](element)


David
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