# Problems with difference

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## Re: Problems with difference

 The stack and pips are nice solutions.The rotation rotFromTo(a,b) is the rotation with minimum angle that maps the direction of vector `a` to the direction of vector `b`. It can be coded in many ways. As a function returning a 4x4 matrix, it can be found in the Tips&Tricks page of the OpenSCAD Manual. As a module, I like the following:module rotFromTo(di,do) {  if( norm(di) < 1e-16 || norm(do) < 1e-16 || norm(do/norm(do)+di/norm(di))<1e-16 )     children();  else     mirror(do/norm(do)+di/norm(di)) mirror(di) children();}  _______________________________________________ OpenSCAD mailing list [hidden email] http://lists.openscad.org/mailman/listinfo/discuss_lists.openscad.org
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## Re: Problems with difference

 In reply to this post by rugyoga Found a nice way to calculate your flattened diamond, which I understand is the primitive you are going to print: module flattened_diamond(){     p = [v[0], v[6], v[18], v[8], v[20], [0,0,0]];  // add origin   intersection()   {     scale(1.5) hull() polyhedron(p, [[0,1,2,3,4, 5]]);     diamond();   } } -- Sent from: http://forum.openscad.org/_______________________________________________ OpenSCAD mailing list [hidden email] http://lists.openscad.org/mailman/listinfo/discuss_lists.openscad.org