Generated stl object is non manifold

[chertykov]

I have generated stl on web site from the following simplest code:

function main() {
   return difference(
         cube({size: 3, center: true}),
         cylinder({r:1, h:3, center: true}).rotateX(90)
      );
}

Then downloaded it and imported to Blender and checked for manifold.

[NateTG]

That probably has to do with having the cylinder's top and bottom coplanar with the faces of the cube somehow. Have you tried h:3.5 with the cylinder?

[chertykov]

I have tried h:3.5 - no difference.

[franzherzog]

Code with changes is working on http://joostn.github.io/OpenJsCad/processfile.html

function main() {

  var cube = CSG.cube({
    center:0,
    radius : 3
  });

  var cylinder = CSG.cylinder({
    radius:1,
    start: [0, -3, 0],
    end: [0, 3, 0],
  });

  var csg = cube.subtract(cylinder);
  return csg;

  /*
     code below created many manifold errors on stl export
  */

  /* return difference(
         cube({size: 3, center: true}),
         cylinder({r:1, h:3, center: true}).rotateX(90)
      );
  */
}

[hovissimo]

Any traction on this issue?

I'm having the same problem with a much more complicated part. https://gist.github.com/hovissimo/ce5366a35834c3690488

Light blue lines show discontinuities: http://i.imgur.com/kDbFl6L.png

FWIW, this is worse with the AMF exporter.

[z3dev]

Pull request #107 contains some changes to CSG.js and openjscad.js. I ran some tests and all issues with T-junctions were resolved after making those changes.

If you need this fixed then please make the changes manually.

[z3dev]

This issue was moved to jscad/io#15