topic Re: how to affect xgen expression for a specific index archive? in Maya Forum

how to affect xgen expression for a specific index archive?

Anonymous — Tue, 10 May 2016 15:43:30 GMT

I've been trying to modify the primite attributes in XGEN for a specific index item but i'm a bit unclear on the SeExpr expression syntax and I haven't been able to find any examples that deal with the $id or the index value from other attributes beside index.

for example, I want to change the xgen length attribute for only primities at index[2].

ive dug through the api docs for maya and seexp http://wdas.github.io/SeExpr/doxygen/userdoc.html

sorry for the beginner question 🙂

thanks

Re: how to affect xgen expression for a specific index archive?

Michael_Todd — Fri, 13 May 2016 21:25:10 GMT

One way to do that is to use Archive Expressions. This allows you to have an expression for each archive in the list that can be passed through to other parameters such as length, width and depth (just for example)

You give the expression a name then hit the + and this will add an expression slot per archive:

These expressions ae linked to the object index so you can add different values for each. In this instance I made them all sliders by just resetting to slider:

then you can adjust the min/max values for the sliders in the expression editor by changing the values in red after the #;

then you have a slider for each object in the list:

To use these expressions you then just add the expression name, in this case ArcLength, to the parameters you want to affect.

Then each archive will have the value from their corresponding expression passed through to the parameter.

Cheers

Re: how to affect xgen expression for a specific index archive?

Anonymous — Mon, 16 May 2016 14:16:56 GMT

ah I never noticed that tab before! Here I was trying to use the global expressions.

works great! thank you!

Re: how to affect xgen expression for a specific index archive?

Anonymous — Fri, 13 Jul 2018 08:04:19 GMT

Work like a charm