Ive uploaded a 3D model to help explain the situation. In reality the members (lines) in one direction will be in a different plane to the members running in another direction (3No. planes in total). I need to know the chord length and height of every arc (so they can be fabricated). The trouble is the diagonals are not actually drawn as arcs (they are the surface lines of a torus). Is there a way i can convert these to arcs? Ive been trying to draw 3 point arcs on top of them, but it doesnt seem to be snapping to these lines correctly. It would be great if i could pull up an elevation of each arc also. Tried cutting a section but it says not cutting through any 3D objects. Thanks for any help
Hi,
you can first set the UCS to be parallel to the object (using command _UCS and option _OBJECT).
Then you can start the _ARC command and show 3 points on that base-object, first is the start-point then (with object snap _NEAREST) any point on the base-curve and then the end-point for the arc.
HTH, - alfred -