How to separate a geometry having distinct objects ?
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How to separate a geometry having distinct objects ?
 
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Hello, this is my first post here as I'm using OpenSCAD again after years. I'm trying to code a 2 axis slicer and there is a step that seems impossible to do, but maybe is it because I'm not aware enough of functional programming techniques. Here is what I do : - I have a volume - make several cuts along 1st axis (intersection of volume and a cube) - make several cuts along 2nd axis (intersection ...) - gather intersection of those cuts Then, there is the step that I cannot do : access each of the gathered intersections, and split each of them in half (top and bottom). Next steps will be : - subtract union of top halves to each cuts along 1st axis - subtract union of bottom halves to each cuts along 2nd axis - produce a projection of each cuts This is something I'm doing with OpenJSCAD for years now and I needed to write my own 3d split code to be able to do so. The main problem is that sometimes an intersection returns two or more separated object into the same geometry and my process need to split each of them separately in order to make correct cross pieces. Is it possible to split a geometry having separated objects so that each can be processed separately ? my code : (I need inter() to have several children instead of only 1) w= 0.6; inter(); translate([20,0,0])tranchesX(); translate([-20,0,0])tranchesY(); translate([0,0,30])volume(); module tranchesX() { for(i = [2:3:12])trancheX(i); } module tranchesY() { for(i = [0:4:20-1])trancheY(i); } module inter(){ intersection(){ union(){tranchesX();} union(){tranchesY();} } } module trancheY(dec) { intersection() { translate([-1, dec, -1])cube([14, w, 22]); volume(); } } module trancheX(dec) { intersection() { translate([dec, -1, -1])cube([w, 12, 22]); volume(); } } module volume() { difference(){ cube([12,10,20]); scale([1,2,1])translate([6,2.5,6])sphere(r=5); } } _______________________________________________ OpenSCAD mailing list [hidden email] http://lists.openscad.org/mailman/listinfo/discuss_lists.openscad.org |
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Re: How to separate a geometry having distinct objects ?
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Re: How to separate a geometry having distinct objects ?
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In reply to this post by gilboonet
As Carsten said, there's no way to "split" geometry.
If, for instance, you wanted to take a sphere, cut the top half from the bottom half, and separate the two halves, the only way to do it is to create *two* spheres, cut away the top half of one, and cut away the bottom half of the other. Now, because OpenSCAD is after all a programming environment, that doesn't mean that you have to type out both models. Start with this module:
and here's how you use it: cut(10) sphere(10); and here's what you get:
The same principle applies to any other kind of cut: for each
"segment", generate the model and cut away what you don't want in
that segment. _______________________________________________ OpenSCAD mailing list [hidden email] http://lists.openscad.org/mailman/listinfo/discuss_lists.openscad.org |
Re: How to separate a geometry having distinct objects ?
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Re: How to separate a geometry having distinct objects ?
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Re: How to separate a geometry having distinct objects ?
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Re: How to separate a geometry having distinct objects ?
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Re: How to separate a geometry having distinct objects ?
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Re: How to separate a geometry having distinct objects ?
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Re: How to separate a geometry having distinct objects ?
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Re: How to separate a geometry having distinct objects ?
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Re: How to separate a geometry having distinct objects ?
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Re: How to separate a geometry having distinct objects ?
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Re: How to separate a geometry having distinct objects ?
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Re: How to separate a geometry having distinct objects ?
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Re: How to separate a geometry having distinct objects ?
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Re: How to separate a geometry having distinct objects ?
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