backpack design challenge

[microelly2]

I would like to create a pocket on the side ofthe backpack. I guess this should be possible by drawing a uv-curve in the uv-space. Are there any experiences with mapping a bspline from uv-space to the surface?

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[looo]

Interesting task.
I use Bezier curves based on sketches
the face is calculated as a product of the border beziers (something like a gordon surface)
everything is parametric - sketches and datum planes

Yes, I think there are two ways towards this problem. The full parametric way, where everything is defined via splines and the freeform-approach. Both ways have there advantages... The way that is more suited for freecad is maybe the parametric way, defining everything via wires. Maybe it's time to try this approach and see what is possible. At least your car-example looks quite promising.