I'm new to OpenSCAD, so forgive my ignorance of functions and terminology. I am trying to design a shape that will slip over another piece. So, for instance, imagine that I'm trying to create a cube/box that can slip over a sphere: the function I'm looking for would create successfully larger dimples until it reached the full diameter of the subtracted sphere, but then *would not* close in despite the sphere being "inside" the box. It seems to me that this might be done by translating the "clipping" shape along a path, creating a thin difference(), projecting the negative of *that* down the path and difference()ing that with the other elements of the clipping shape, and then moving the clipping shape another increment. Is there such a function or library? -- View this message in context: http://forum.openscad.org/Function-operator-similar-to-difference-for-bounds-along-path-Shapes-can-slip-over-each-other-tp17871.html Sent from the OpenSCAD mailing list archive at Nabble.com.

If your sphere is convex (they usually are, but sphere here just means the inside shape) then you can do this : Difference () { Cube(...) ; Hull() { Sphere(...) ; Translate (where to slip to) sphere(...) ; } } If you replace sphere() with a concave shape (e.g. a star) then hull will not work as expected. Instead you may replace the hull(){...} section with a hacked Minkowski. This will always slip the star up, rotate the cylinder if you must change this. Minkowski () { Star(...) ; Cylinder(h=slip distance, d=0.00001); } Em 3 de jul de 2016 17:45, "lobrien" <lobrien@knowing.net> escreveu: > I'm new to OpenSCAD, so forgive my ignorance of functions and terminology. > I > am trying to design a shape that will slip over another piece. So, for > instance, imagine that I'm trying to create a cube/box that can slip over a > sphere: the function I'm looking for would create successfully larger > dimples until it reached the full diameter of the subtracted sphere, but > then *would not* close in despite the sphere being "inside" the box. > > It seems to me that this might be done by translating the "clipping" shape > along a path, creating a thin difference(), projecting the negative of > *that* down the path and difference()ing that with the other elements of > the > clipping shape, and then moving the clipping shape another increment. > > Is there such a function or library? > > > > -- > View this message in context: > http://forum.openscad.org/Function-operator-similar-to-difference-for-bounds-along-path-Shapes-can-slip-over-each-other-tp17871.html > Sent from the OpenSCAD mailing list archive at Nabble.com. > > _______________________________________________ > OpenSCAD mailing list > Discuss@lists.openscad.org > http://lists.openscad.org/mailman/listinfo/discuss_lists.openscad.org >