Hi Yakas is it possible for you to send the file to me over here? For a large file like that you'd need to use a file sharing service like Dropbox or Microsoft One Drive, and then send me a link to it through e-mail at moi@moi3d.com

That could help me to discover what the problem is with the survey data and see if I could solve it for v4.

Maybe it has something to do with things located a far distance away from the 0,0,0 origin point (which tends to reduce numeric accuracy on general math computations), or something to do with large scene bounding boxes or something like that.

But I would need to be able to reproduce it over here first in order to have a chance at solving it for v4 though.

Thanks, - Michael