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Where ADD fails during Extrude

steve_shubinsteve_shubin Member Posts: 1,094 ✭✭✭✭
edited August 2019 in Using Onshape

A post by @omri_r got me to looking at why ADD doesn’t work at times while Extruding.

So we have a single part made up of a cuboid and a cylinder. And right through the middle of the cylinder we have a sketch of an inverted V.





There’s actually 3 different sketches that I used in the below GIF’s where the sketches have different end points on the inverted V.









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Comments

  • NeilCookeNeilCooke Moderator, Onshape Employees Posts: 5,651
    edited August 2019
    Hi @steve_shubin - thanks for posting this. These examples will create non-manifold geometry (easiest way to think of this is that an edge of a solid can and must only be shared by 2 faces - in these examples the edge would have 4 faces). These conditions arise when an edge or vertex touches a face from the same solid body creating an infinitely small region or singularity. I'm sure there's a more mathematical reason, but always think 1 edge, 2 faces.
    Senior Director, Technical Services, EMEAI
  • steve_shubinsteve_shubin Member Posts: 1,094 ✭✭✭✭
    @NeilCooke

    That’s a very good explanation you gave Neil. Even I could understand that. LOL
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