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Houdini arnold overscan percentage

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Any help about rendering with Arnold in Houdini about overscan margins?

I'm trying to render different amount of % of overscan. 

E.g, shot resolution is: 3170 x 2378.

Overscan is 15%.

How can I insert percentage at overscan margines?

I can easily put pixels amount as: 100,150 or etc, But if I try to put % sign I'm getting error while rendering on farm (deadline) (  Unable to evaluate expression (Expression stack error (/out/arnold_DUST/ar_overscanx)).\n ).

Best Regards,


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