Python scene access list

[CGMas]

Hi everybody,

I'm new in this forum so let me introduce myself.
My name is Maxime, I'm Lighting TD at Supamonks .

We're currently experimenting on Vray Python Access but we've encountered some difficulties with lists... I've sent an e-mail to chaos group support but I haven't got feedback regarding this point.

We've tried to set lists (like colors in a ramp) with the post translate script but it returns the following error :

def postTranslateScript():
import vray.utils
ramp = vray.utils.findByName('ramp1')[0]

if 0:
colors = ramp.get('colors')
colors.pop()
# This line will warm: // Warning: line 1: Invalid value given for parameter "colors" in plugin "ramp1". //
ramp.set('colors', colors)

else:
# This line will warm two: // Warning: line 1: Invalid value given for parameter "colors" in plugin "ramp1". //
vray.utils.pluginmodifier._setParam(ramp._name, 'colors', (12, ['ramp1_color_0', 'ramp1_color_1']))

So, it seems that lists cannot be used in python scene access...
Am I right ?

Thanks,

Max

[vlado]

We do support lists in general; can you tell me which V-Ray version you are using?

Best regards,
Vlado

[CGMas]

Oh ! Sorry, I forgot to mention it ^^'
We're using vray 2.40 with maya 2012.

Thanks,
Max

[bigbossfr]

It is a bug with ramp in Python access ^^

[ivaylo.ivanov]

Yes, the Python script can't export list of textures. Will fix this.

[CGMas]

Ok, thank you all for your answers !
Would you have an idea of when we could expect this fix ?

[ivaylo.ivanov]

It will be in the next nightly. But this means 2.45.

[CGMas]

We have access to nightlies version so it's a really great news !!
I may have some further questions regarding python scene access, can I ask these questions here ?
For example, we would like to kill a render process using python.
Is there a way to do it ?

[ivaylo.ivanov]

When do you want to kill it? In some of the callbacks or from the script editor while rendering?

[CGMas]

Actually, we would like to be able to stop it with the post translate python script in case there's something wrong.

[ivaylo.ivanov]

I thought that there is a standard way to send "abort" signal to the renderer (like clicking Esc), but it seems there isn't. We can extend the vrend command with something like "-abort". Currently it can abort only IPR rendering.

[CGMas]

It could be great !
So, this mean that the vrend command is callable during the execution of python post translate script ?
And, if you extend the vrend command would it be possible to add a flag to translate only selected objects ?

[ivaylo.ivanov]

vrend can be executed in the post translate, but with limited functionality since you are already rendering. It's ok to abort rendering. Will be in the next nightly.
There is a way to render and translate only selected objects, but it's not very convinient:

optionVar -iv renderViewRenderSelectedObj 1;

And you must not forget to restore it to 0. This can be set before rendering using a script or a prerender MEL. And restored with a postrender MEL.

[bigbossfr]

It would be very great if we can have something like : vrend -selectedObjects MyList

Premel and PostMel are a hell in production (and it can be very dangerous. Imagine if we have an error (crash, network...) during rendering, we will break the optionVar of the user).

[CGMas]

It would be very great if we can have something like : vrend -selectedObjects MyList

Premel and PostMel are a hell in production (and it can be very dangerous. Imagine if we have an error (crash, network...) during rendering, we will break the optionVar of the user).

I totally agree with that ! ^^