Maya python

[Dariusz Makowski (Dadal)]

Heya

Smashing my head here... How can I add a Reflection/refraction/etc layer using python command ?

Thanks, ciao.

[vlado]

You mean a render element?

Best regards,
Vlado

[bigbossfr]

import pymel.all as pm
reflection = pm.mel.eval('vrayAddRenderElement("reflectChannel")')
refraction = pm.mel.eval('vrayAddRenderElement("refractChannel")')

Like this ?
Or renderLayer ?

[Dariusz Makowski (Dadal)]

I mean render element like LightSelect. Trying to write python based(not pymel...sry) to create LightSelect per light in scene for selected render layer...

I think I can use

import maya.cmds as cmds
cmds.setAttr('vrayAddRenderElement('reflectChannel ')') if bigbossfr aproach will work... not sure I'm not at home :/

thanks tho !

[bigbossfr]

import maya.mel as mel
reflection = mel.eval('vrayAddRenderElement("reflectChannel")')
refraction = mel.eval('vrayAddRenderElement("refractChannel")')

[Dariusz Makowski (Dadal)]

Howdy

bigbossfr - your script work like charm ! But I'm still trying to get it to work in python.


So far this command

cmds.addAttr('vrayAddRenderElement("reflectChannel ")')

give me

# Error: No object matches name: vrayAddRenderElement("reflectChannel")
# Traceback (most recent call last):
# File "<maya console>", line 1, in <module>
# ValueError: No object matches name: vrayAddRenderElement("reflectChannel") #

this error:/


Also side note how do I get somethink linked to lightselect node? I cant quite figure it out and youtube vray channel dont show it :s or Im blind/deaf

[vlado]

The script that bigbossfr posted is in Python.

The light select element is a set; you use the Relationship Editor in Maya to assign lights to it.

Best regards,
Vlado

[bigbossfr]

Do you know Python ?

Because :

cmds.addAttr('vrayAddRenderElement("reflectChannel ")')

will not work...

addAttr is to add attributes on a node. Here, you not add an attribute, you want to create a renderElement.
So, like i wrote, the command in Python is :

import maya.mel as mel
reflection = mel.eval('vrayAddRenderElement("reflectChannel")')
refraction = mel.eval('vrayAddRenderElement("refractChannel")')

With the Maya mel module, because "vrayAddRenderElement" is a mel command.

Or :

import pymel.all as pm
reflection = pm.mel.eval('vrayAddRenderElement("reflectChannel")')
refraction = pm.mel.eval('vrayAddRenderElement("refractChannel")')

With the PyMel module.

If i understand, you want to create lightSelect for each light in each renderLayer.

For this in Python :
You list all renderLayers :

import maya.cmds as cmds
allRenderLayers = cmds.ls(type = "renderLayer")

After, you list all lights :

allLights = cmds.ls(type = "renderLayer")

Now for each layer, and each light, you create one renderElement light select, linked ton the light :

import maya.cmds as cmds
import maya.mel as mel
allRenderLayers = cmds.ls(type = "renderLayer")#get all renderLayers
for myLayer in allRenderLayers:
    cmds.editRenderLayerGlobals( currentRenderLayer=myLayer )#swtich to current renderLayer
    lightType = cmds.listNodeTypes( 'light' )#get all lights type
    for eachType in lightType:
        for myLight in cmds.ls(type = eachType):#get all lights for each of type light
            transform = cmds.listRelatives(myLight, p = True)#transform of the light
            renderElement = mel.eval('vrayAddRenderElement("LightSelectElement")')#create the light select
            cmds.sets(myLight, addElement = renderElement)#connect the light to the render element
            cmds.rename(renderElement, "lightSelect_" + myLayer + "_" + transform[0])#rename your renderElement

But, Maya python module is shit.
Use Pymel :

import pymel.all as pm

for myLayer in pm.RenderLayer.listAllRenderLayers():
    myLayer.setCurrent()
    for eachType in pm.listNodeTypes( 'light' ):
        for myLight in pm.ls(type = eachType):
            renderElement = pm.mel.eval('vrayAddRenderElement("LightSelectElement")')
            set = pm.PyNode(renderElement)
            set.add(myLight)
            set.rename("lightSelect_" + myLayer.name() + "_" + myLight.firstParent())

But, this 2 workflows are shit. You will have a scene with a lot of "light select". And if you add a lightz, it will be a nightmare to manage...

Use the powerfull V-Ray Scene Access to create this on fly.

On render global, in Vray common ---> post translate python script, add this :

import vray.utils as vr

for myLight in vr.findByType("Light*") + vr.findByType("MayaLight*"):
    name = "lightSelect_" + myLight.name()
    vr.create("RenderChannelColor", name)
    lightSelect = vr.findByName(name)
    lightSelect[0].set("name", name)
    myLight.set("channels", [lightSelect[0]])

Now render and see what it's happened.
With this, you add renderLayers, lights, what you want, vray will create all renderElements on the fly.
Nothing to manage, nothing to update, nothing to do.

[airstyle]

+1 on bigbossfr's post-translate method, I created a simple gui/light select manager which simply adds a custom user attribute to the lights you want light selects on, then the post translate script is almost identical to bigbossfr's except it checks for the custom attribute - easy!

[Dariusz Makowski (Dadal)]

Heya

Thanks a lot for help ! Ur script do make a lot of sens. I guess I was digging the wrong way around... As to me know python well... I'm learning it from few months so its WIP and a lot of mistakes hehe

Thanks, ciao.

[ALFRED_ST_MEDIA]

Zoweee! I tip my hat to you bigbossfr. I feel like I just went to school after reading that post. Great info.

[ALFRED_ST_MEDIA]

btw, Vlado...any future in python module for vray? Has someone else done this? Just checking brefore I re-invent the wheel.

Thanks to all.

-ctj

[vlado]

There is a plan to port the Python callback for V-Ray Standalone (almost done too), but for the moment, that's it. It only includes methods for manipulating the V-Ray scene before the rendering, same as in Maya. And it's already starting to be a headache, as linking against Python is causing all sorts of issues with applications that already have Python.

Other than that, can you explain a bit what do you expect to do with such a Python module?

Best regards,
Vlado

[Dariusz Makowski (Dadal)]

Heya

Another bit of script im fighting with... Trying to write a simple ui to change subd/intensity etc on all selected lights. I got most of light setting covered but not the subd/intens... for some reason I cant get it to work

Have a look let me know where run wrong... for some reason lights in vray are very weird...

import maya.cmds as cmds

def subD(*args):
	textFieldAinput = cmds.textField('subDiv',q=True,text=True)
	#print textFieldAinput
	lightlist = cmds.ls(sl=1)
	print lightlist
	for relatives in lightlist:
		
		litShape = cmds.listRelatives(relatives, c=True)
		#hierlist = cmds.select(lightlist, hi=1)
		for lights in litShape:
			#try:
			#test = cmds.setAttr('%s.%s'%(lights, 'intensityMult'), textFieldAinput)
	
			test = cmds.setAttr('%s.%s'%(lights, 'subdivs'),textFieldAinput)
	
	
			print test
			#except:
			#	pass
'''		
ba=cmds.ls(sl=1)
da=cmds.select(ba,hi=1)
print ba
for objects in ba:
	try:
		cmds.setAttr('%s.%s'%(objects,'intensityMult'), 5025)		
	except:
		pass
	
	'''		
if cmds.window(window, exists=True):
	cmds.deleteUI(window)
cmds.window(w=200,h=200)
cmds.showWindow()
cmds.columnLayout()
cmds.text(l='Subdivision')
cmds.textField('subDiv',cc=subD)