missing Z component copy/interpolation

[gjaegy]

Hi,

It seems there are still some points that get created without SetZ being called, or without having the Z value copied from the original point.

So, some points end up with the default Z value, which wasn't the case with Clipper1Lib.

That's the case for instance when intersecting two polygons, or when using RectClip(). I assume there are more location where Z is not copied/interpolated.

I haven't been able to identify all locations in the code where such Z definition is missing. Any help would be appreciated ;)

Thanks a lot !