Rhino Fundamentals 6a: Trouble-shooting Modeling Errors (edge analysis, boolean failures etc.)

[@saraa7117]

LIVE SAVER, these are common issues which are difficult to solve most of the time but not anymore. Thank you.

[@68waelsabry]

Thanks for the very important tips I got an open brep that prevents me to Boolean the object with another

[@lolololol4870]

Thank you so much. This video helped me to solve lots of problems I had! Amazing!

[@flamekinger1021]

Thank you! you really help me with this video!!!

[@chriscadman5715]

Informative! Can you tell me what's the full set of Rhino6 tools are for checking surface geometry on imported surfaces? I'm thinking about open edges, overlapping edges, disjointed vertices, bad surfaces, etc. Thanx!

[@parametricphilosophy1072]

Hi Chris, thanks for reaching out! I don't know of anything else off the top of my head that might help, other than what's discussed in this video. You can identify a bad or invalid surface with the "What" command. The "Show Edges" will help you identify where a surface might be open/overlapping/invalid. You may already know this, but in the "Show Edges" tool, naked edges are were a surface edge is not joined, and Non-Manifold edges are where an edge is joined to more than one other surface edge. Both conditions will result in a bad polysurface. If you're having troubles with imported meshes, that's a different story. You might want to look into commands like "Mesh Repair" and/or "Unify Normals" and others. I've had to use those before, but to be honest I don't have much experience with mesh modeling in particular. If you have a specific problem I might be able to offer better advice. Let me know. Best, Phil

[@chriscadman5715]

@@parametricphilosophy1072 Thanx for this good info. I guess I'll have to work with what I have for the time being. I really don't have any problems with meshes, b/c I have a number of programs which can handle them. But with surface models imported from other software, that's where the problems begin. Apparently there's either a translation problem, or the models aren't created right, or the native software doesn't make them right. In any case, I'll have to work it out the hard way. Thanx!

[@chriscadman5715]

@@parametricphilosophy1072 Thanx for your detailed response. I'm trying to get back into surface modeling, so want to start from the bottom up and get it right this time, so thanx for your great stuff! Cheers...Chris

[@chriscadman5715]

@@parametricphilosophy1072 OK, thanx.

[@jeffreyyyy]

Geometry fix toolbar

[@harisanker7630]

I'm not able to solid difference brep group using another groups of breps using grasshopper or rhino

[@Fritz00]

Tank you! I realy help me this video!!!

[@parametricphilosophy1072]

You're very welcome!

[@jeffreyyyy]

Hi phil i have some trimmed surfaces joined together. When i try to mesh the joined polysurface , some mesh faces appear at the edges of the trimmed surfaces. So i tried to rebuild the original surfaces but this time some small gaps has occured between the trimmed edges. How can i prevent this from happening?

[@parametricphilosophy1072]

Hi BC! It's hard for me to offer any concrete advice without knowing exactly what your situation looks like. I've never experienced this problem, but it sounds like the edges are joined perfectly. I'm just guessing though. Some things you could consider: 1. ShowEdges to see if you have any unexpected naked edges 2. Matchsrf - you can use this to create a perfect seam before joining two surfaces. This would require one of the joining edge surfaces to be untrimmed. 3. Refit Trim - can be used to create an untrimmed surface that matches the original trimmed surface as close as possible. Note that the shape will probably not be an exact geometry match. 4. Blendsrf - can be used to create a perfect transition between surface edges. You would have to create a gap between surface edges for the blendsrf to work. Let me know if you figure it out. I'm curious what the problem and solution might be.

[@jeffreyyyy]

​@@parametricphilosophy1072 thanks for the reply phil. i meant some triangular protrusions formed on the outside of the edges of the surfaces after meshing.

[@parametricphilosophy1072]

@@jeffreyyyy hi BC, yup I totally understood the problem. But it sounds very strange so I'm thinking outside the box. My first thought was that maybe it isn't closed properly so the polysurface edges don't have defined edge boundaries, which is revealed when converting to Mesh. I could be totally wrong. If you're still having problems, send me an email with your file to [e-mail] No garentee that I'll have a solution but if there's anything that stands out to me at first I can let you know.

[@jeffreyyyy]

@@parametricphilosophy1072 thank you phil for now i have solved the problem by extracting borders, rebuilding and retrimming. I think its a common problem with rhino it could be some kind of a bug. Thank you anyway

[@parametricphilosophy1072]

Great, glad you got it sorted out, and thanks for updating me on the solution. 👍

[@brodeesmith]

THANk YOu for thIS!!!!

[@parametricphilosophy1072]

You're welcome!!