I have two extruded surfaces forming to solids. The one on the left displays as a solid the one on the right displays as a wire frame. I am using V6 with latest updates. What is happening.
test.3dm (1.3 MB)
Hello - look closely here:
(I used a cheat - a test command, testIntersectSelf to find this, but I got a clue from PlanarSrf telling me that there were self-intersections in the outer curve.)
-Pascal
Thank you
Hi Pascal, I’m having the same issue. I ran the testIntersectSelf command but it came back clean. And the object passed check as well. Do you mind please having a look?
Thanks
H
Hi @hayden,
The problem is actually in display rendering as a result of the Custom Mesh settings you are using in Document Options. The Maximum Aspect Ratio should be set to 0 for long, thin objects. (Or use Smooth and Slower instead of Custom).
Regards
Jeremy
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Thanks Jeremy. Not sure how that happened. I don’t think I ever fiddled with the Document Options.
Cheers
Hi @jeremy5,
Sorry to bring this up again but the Smooth and Slower setting is now affecting other objects. Any one size fits all solution?
Thanks
H
Can you post a model showing the new problems?
Thanks, I have seen the triangle artefacts before, but not for a while, so I wanted to check that they were reproducible on another machine (they are).
Try these settings:
Maximum aspect ratio set to 0 sorts the long thin walls and Maximum edge length set to 1 sorts out the triangular artefacts.
More info here: Rhino Mesh Settings [McNeel Wiki]
Regards
Jeremy
p.s. As an aside, I note that you have tolerance set extremely fine. Normally you would expect to use something in the range 0.001 to 0.0001
Your settings worked for the bigger object and improved the smaller thinner ones a bit. I remodelled the smaller thinner ones and set it back to the original custom settings and that somehow sorted it. They all now look beautifully smooth. Thanks again for looking into it and the meshfaq.
Guilty as charged re the extremely fine tolerance. I did that a while back but can’t remember why. Must have had an issue and read somewhere I needed to reduce it and went to the extreme. Are there any problems the very low tolerance will cause? I’m a bit hesitant to change it in case the forgotten problem rears its ugly head again.
KR
H
This will tell you what you need to know about tolerances: https://wiki.mcneel.com/rhino/faqtolerances
Sorry for slow reply.
Regards
Jeremy
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Hello - on these objects, you’ll get a clean render mesh at coarser (=faster) settings if you run
`DivideAlongCreases’ > SplitAtTangents=Yes.
Smooth and Slower works fine.
-Pascal
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