Can someone help me perhaps figure out why my surface is gone? it says it is still solid and i can look through the object, but i can’t get it back. Im quite new to Rhino so maybe it is a small thing. Appriciate it!
Hey Jesse -
It’s hard to tell from pictures. Please always post a 3dm file.
It looks like the display meshes are not being created for some surfaces. A defect trim curve could cause that. Extracting surfaces and untrimming and retrimming them might work…
-wim
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Hey Wim,
sorry i’m really new in this kind of stuff and such so im not really aware what i have to upload, but thank you for the information!
i’ve found out where the problem comes from but can’t really find out why is happens.
sorry that i again use pictures but maybe this will be more clear.
the problem comes from the selected part. When i want to booleanUnion the part with the main part is happens
this is the image after i have made a union
is the 3dm file by the way the Rhino file?
yeah it helped! thank you very much! It is still a bit weird for me why it happens tho, because it just dissapears when I use BooleanUnion. Thank you still 
Hey Jesse -
Yes, that’s the file we need here.
Is that a curve or a surface edge?
Same question here.
-wim
auto’s.3dm (3.6 MB)
This is the file. The problem is on the left where the 2 objects are surrounded by a rectangle. Maybe you can see the problem.
- Jesse
Sorry if i’m not clear about things
those were curves by the way, but i changed it that everything was gone and that only the solid polysurface remained. But when I booleanUnion something around that area it still makes the surfaces disappear
-Jesse
When I extract and untrim your surfaces, the seam of the cone shape is directly on the edge of your part…this is likely creating a small defect if it happens to be just a tiny hair off the planar surface it’s intersecting…
use srfseam and rotate the seam to a spot where it’ll be trimmed off and the problem goes away.
this is a common problem with booleans, they do not like seams to be coincident with a face.
simply extract, untrim and move the seam using srfseam, then retrim and join-
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Now thats very useful to know srfseam
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Thank you so much for the video and explanation! now i know how to move on and use it correctly, thank you again!!!
anytime- happy modeling!