This is the right place for Ren'Py help. Please ask one question per thread, use a descriptive subject like 'NotFound error in option.rpy' , and include all the relevant information - especially any relevant code and traceback messages. Use the code tag to format scripts.
For example, perhaps passing in a set of 2 coordinate pairs to draw a line displayable, such that at different points in my game the line could connect different pairs of points. I know this is trivially easy to achieve by just resizing and reorienting the line as a normal displayable, but I'd like to be able to do it as a UDD to better understand UDD and achieve more complex renders.
If anyone could explain (or better show me) how, I would be really grateful.
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$udd = UDD()
$udd.variable = 1
looks like this will work. thank you.