Hello,
I haven't read your mail in much detail, but generally it is a very bad idea to directly modify nodes of a path. Could you exp
Actually, the effect is live version of "perspective" extension. The input is rectangle with modifiable by user nodes (which is originally generated from the object bounding box), the result - the object would be inscribed into modified rectangle, so it would look like in perspective.
I am not aware if this problem has a solution based on some kind of generic coordinate transform formula, which could be applied to the whole Piecewise object, so I use my own solution of the problem based on straight-forward linear geometry, which calculates new position for each object's point and then tries to apply this value to the original point - as if the user used "node editor" tool to move points to the places where he wants to. I can try to describe the algorithm in more details if that makes sense.
I know there is experimental perspective_path live effect which also works with perspective, but when I tried it, it appeared that it works in some different way - it does not use bounding rectangle to setup perspective, but relies on object resize/movements instead, so this is not what I need exactly.
I also looked at the perspective.py code, but it seems that python extensions work in a bit different way than live effects, so I could not neither reuse it as is, nor understand its formula basing on source code without comments.
thank's Anton