Multiple problems with this geometry. Polysurfaces not closed?

Rhino
1

Hello!

I have some problems with this geometry and I dont know how to fix them!

  1. I want to remove this part using booleandifference with a box, but I just cant do it. Is there something wrong with this model?

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image1576×955 90.5 KB

  1. And also I want to use the function shell but the geometry is to complex I think. There are some open surfaces and I cant fix it. How would you guys do it if not using the shell function?

These are the surfaces I want to remove using shell.

image
image1582×876 61.5 KB

2

can you post the geometry?

3

HobNob Roof.3dm (545.8 KB)

I forgot to post it! Here it is… :slight_smile:

4

If the Boolean command doesn’t work, it’s almost always because the geometry isn’t solid. Check your geometry with the “ShowEdges” command!

5

image
image1344×1090 66.8 KB

There’s your problem

I deleted the problematic surface, lofted a new one.

I also deleted the largest surface and created a new one with the border of the joined rest.

image
image2152×1052 205 KB

Now it’s closed

HobNob Roof closed.3dm (555.8 KB)

1 Like
6

Unfortunately I can not open your file because I am uing rhino 8.

But I tried to copy the steps you did. I removed the surfaces as you are showing in the images, and I created a new one and joined them. But I still could not do a booleandifference as in step 1) in my first post.

7

Is your polysurface closed?

HobNob Roof closed 8.3dm (574.2 KB)

8

What purpose does the shelling have for you? Is it for 3D printing?

9

I am not sure how to check if they are closed. I tried ShowEdges command but I am not really sure what to look after.

Here is the one that I tried to fix. I removed the surfaces you mentioned and replaced them. But there is still something wrong. Can you see what it is?

HobNob Roof -2.3dm (514.9 KB)

10

No 3D printing! I just want the roof to have a geometry that is more “real” and not just a big block.

11

Simple bodies can be shelled usually but every additional edge adds trouble.

I think you have to do it manually

1 Like