sorry for the (huge) delay. Unfortunately I'm still caught up in a lot other stuff and can't make the time right now. I'm however still committed to bringing this upstream eventually (can't tell when exactly though) and am checking by the forums every now and then.

Hi bernd,
I have not forgotten about this and will definitely come back to it when i can make the time!
cheers

I'm looking for a way to create a new DocumentObject type in python, that basically combines a DocumentObjectGroup with a Part::Feature. The idea is to let this object hold the original shape and some extra attributes while keeping some derived objects in the group. The obvious solution here would b...

Thanks microelly2! That's of course a valid solution. However, I forgot to mention that I need to do a lot of offsets on different surfaces (with varying curvature), so manually working around self-intersections really isn't an option for me. I was kind of hoping this had already been implemented so...

I was wondering if there is a way to offset a spline surface in a way that avoids self-intersection. From my (limited) research it looks like Parts offset feature mainly wraps the respective OCCT feature. https://www.opencascade.com/doc/occt-7.2.0/refman/html/class_b_rep_offset_a_p_i___make_offset_s...

Do you have an idea how to implement the criteria in a general way? What I'm planning to do is to pass a 4 value (x,y,z,magnitude) vectorfield to vtk and use the magnitude information to choose the glyph-type (the sign of the magnitude being the indicator). If magnitude isn't available or if the ch...

Once again thank you very much for your valuable input, @ickby! I now got almost everything working as intended. points on my todo list: Use the principal stress magnitude to select the arrow-shape Desired behaviour is: arrows facing each-other for compressional stresses; arrows facing in opposite d...

This is tricky with those plain c callbacks, and I never tried this in VTK. One mathod that may work is to utilize the argument. If I understand it correctly, the argument Arg you pass to SetGlyphMethod(callback, Arg) is the same that is passed to the callback itself. So what you can do is for exam...

I took a shot at implementing this and got somewhat close to what i want to achieve. The current code is available on my github: https://github.com/AMstuff/FreeCAD/commit/41781f87ea0fd91540d84924f9966664172ce48d Still i am facing some problems which I hope you can help me with: 1. I have trouble pas...

Thanks for the informative reply ickby! I dug around in the Pipeline/VTK source, yet still can't find anything related to the principal stress vectors. Only the magnitudes keep showing up. Can you please point me to the vectorfields? :) Also thanks for the insight into the inner workings of Pipeline...