The first thing that comes to mind is forceValidate, but I may be 
misunderstanding your issue. Can you send an example of the setup you're using?

Nathan

On May 8, 2012, at 3:45 AM, olivier...@moving-picture.com wrote:

> anybody know how to force nuke to re evaluate all the expressions in the 
> script ?
> I can maybe use that in the render option if nobody has an other idea.
> 
> cheers
> Olivier
> 
> olivier...@moving-picture.com wrote:
>> Hiya,
>> I have a couple of expressions :
>> in a few knobs some expressions looking at the metadata to get some values, 
>> then in a read node an expression in the path to feed those values as the 
>> name of the path.
>> everything is fine in nuke (even if the refresh is not refreshing the new 
>> file until i look something else and get back to it... ideas welcome)
>> 
>> but when I render the file is the last path loaded, it doesn't refresh it at 
>> all.
>> Is there anything I can do to force nuke to re evaluate the expressions and 
>> refresh the file for each frame during the render ?
>> 
>> maybe something to add in the tab Python 'before each frame'  ??
>> 
>> cheers
>> Olivier
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