Is there a way to render by selected object in Python?

[I73]

I am trying to render the selected object in the scene, unfortunately the 'Render-> 'Render selected objects only' doesn't output to the script editor so I can't follow the MEL example. 

Is there anyone that has a working example or command I can use to get a render by selected object?

render = cmds.render('persp', x=300, y=300, abortMissingTexture=True)

[Andrew Hazelden]

The Maya Render View's "Render Selected Objects Only" menu item is defined and controlled in the following MEL file:
/Applications/Autodesk/maya2017/Maya.app/Contents/scripts/others/renderWindowPanel.mel

Besides the menuItem entry, there are two MEL other functions in this script that refer to this specific rendering feature which are "switchSelectObj()" and "refreshRenderMenu()".

Both functions use MEL with an int based optionVar named "renderViewRenderSelectedObj" to turn this rendering mode on and off:
optionVar -intValue renderViewRenderSelectedObj $var;

Regards,
Andrew Hazelden

[I73]

Hey Andrew, thanks for the reply, and sorry for the late reply. 

So I am still not fully understanding what the render view is doing. Am I going to have to use mel.eval to call renderViewRenderSelectedObj? Or can I preform this in python?

Or is there a better way to render out the selected objet only by the cmds.render('persp', x=300, y=300, abortMissingTexture=True)

Thanks! 

[Wesley Keeling]

It works when I call the eval, but it only works when I first manually render the scene after executing:

import maya.mel as mel

mel.eval('int $var = 0; if( `optionVar -exists renderViewRenderSelectedObj` ) { $var = (! `optionVar -q renderViewRenderSelectedObj`); } optionVar -intValue renderViewRenderSelectedObj $var;')

It seems to not want to refresh the renderer settings till I manually render.  

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[Wesley Keeling]

Well I have a few 'hacks' for rendering the selected object, I would love to not use mel. 

mel.eval('optionVar -intValue renderViewRenderSelectedObj 1;')

mel.eval('renderWindowRender redoPreviousRender renderView;')

mel.eval('prepareRender -invokePreRenderFrame;')

mel.eval('prepareRender -invokePostRenderFrame;')

mel.eval('updateEditorFeedbackRenderLayer RenderLayerTab defaultRenderLayer;')

If there is a better way, please feel free to tell me :) 

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[Andrew Hazelden]

For setting the specific optionVar value you could skip MEL and use this Python command instead:

# Enable the "renderViewRenderSelectedObj" optionVar using Python
import maya.cmds as cmds
cmds.optionVar(intValue=('renderViewRenderSelectedObj', 1))

Regards,
Andrew Hazelden