The big french program have this and I do assure you it's very handy when one work on bigger projects (e.g. you can make sure your project doesn't flip in any other way than you set up from the beginning when you start edit your beloved sketch).
Perhaps a picture says more than ... me?
- sketch_position.jpg (44.3 KiB) Viewed 3490 times
I usually go for "Positioned" which means I get to choose any plane, in the picture they've choose the YZ-plane while I like to use my own created plane.
The origin type; for maximum freedom I mostly go with "Projection point", that is, I select my own created point. This option also does just that, projects the point of choice on the previously chosen plane parallel to its normal.
And finally the orientation; always parallel to a skeleton line or an axle from my own created (master location) coordinate system (which always differs from the part/file absolute zero).
The orange 2D-coordinate system is the sketch own coordinate system.
Inside the sketch one work in the same way as in today’s FreeCAD.
Search the 'net for "*replace with big french program* positioned sketch" and you'll get heaps of examples of different choices for each position, origin and orientation.
I advocate this gives us users a super powerful tool the day one can use linking between containers, especially between non 3D-containers.
For example. if one builds hers/his model smart enough you only need to change a few points and the whole model remodels into a new shape. Put up a skeleton of points on a plane for screw holes, project them on the contact planes for each screw, place this new "Positioned sketch" on that plane with its origin connected to the projected point, make a circle, extrude and voila! You've got a bunch of holes following your hole pattern exactly as you wish!
absolutely spot on !
