Hello Forum, I have joined a few Breps together and inserted them in a list of closed Breps. After that everything looks fine since the Panel shows me a list of Closed Breps. However when in the next step I try to project the Breps, they don’t show up and a panel connected to project shows me the …

[image] I would loft pairs of curves. lofted_pairs.gh (16.0 KB) PS: the input curves are internalised. The Rhino file isn’t needed.

It doesn’t really make sense to project 3D breps onto a plane. You could do this, but it’s not right. [arc projection_2024Aug26a] When you join breps together as you’ve done here, Brep Join is the correct tool, not Solid Union. [arc projection_2024Aug26a2] arc projection_2024Aug26a.gh (15.7 K…

Yes, lofting pairs is a much better approach! It’s interesting to see your use of the Fit Curve. This seems to be a handy component. After I saw it, I remembered the curvature continuity G0-G3 stuff I read some time ago. I should have paid more attention to the smoothness of my input curves. Thanks …

Okay, I see. Brep Join is obviously the correct component. I already thought that Solid Union was not quite right, but it seemed to work, so I went with it. Why does it not make sense to project 3D Breps onto a plane? I don’t have much understanding of what a Brep is. Does this have something to do…

[image] halodri: Why does it not make sense to project 3D Breps onto a plane? I don’t have much understanding of what a Brep is. Does this have something to do with the nature of 3D Breps? Does it make more sense to project “some other 3D stuff”? It makes sense to project points and curves to…

Ok, it’s incorrect, but I didn’t understand the why. I have asked this ChatGPT and it said something like “breps are a “complex data” structure not suited for projection” Instead I should go with a mesh or contours. After a search I found this post that told me I should use Mesh Shadow. This almos…

[image] halodri: The issue is that Mesh Shadow shows an error and some “bricks” are missing. Ask ChatGPT. :rofl:

I did; unfortunately, it didn’t provide me with a good answer. :relieved: Therefore, I have to annoy you humans again. Sorry! :sweat_smile: If someone could me a hint about what is going wrong, I’d appreciate it. Thank you in advance, lovely humans!

Invalid Brep

Grasshopper

Joseph_Oster August 27, 2024, 12:39pm 6

It makes sense to project points and curves to a plane, not breps,

You have Loft options set to ‘Straight’, and as I said, projecting breps to a plane is incorrect, You can create a cross-section like this (purple group):

arc projection_2024Aug27a.gh (10.6 KB)

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Invalid Brep

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