how to project unplanar sketch to curved surface?
With unplanar sketch you don't have specified direction.
You can try to create additional 2D sketch with the path (line with direction) that will intersect with projection surface.
After creating a surface, you can create a 3d sketch and there use intersection curve tool
Another method is to create a plane normal to the projection direction, then start a 2D sketch on that plane and convert entities with everything from the 3D sketch. Then you can use Project Curve to project that 2D sketch onto the curved surface.
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