Capping mesh model

Rhino Rhino for Windows
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1

Hello,

I have a problem with splitting my mesh. I want Rhino to cut off the bottom part of the model and, at the same time, patch or create a surface at the bottom to close the mesh. The goal is to 3D print a castle.

The model comes from photogrammetry, and all I want to do is cut the unwanted parts, shrinkwrap it, and print. Unfortunately, I always end up with a model that’s open at the bottom.

I’ve tried the following:

  1. Mesh Boolean Difference between the model and a mesh planar surface

  2. Mesh Boolean Difference between the model and a mesh box

  3. Split Mesh between the model and a mesh planar surface

Every time, the result is still an open mesh (as shown in the image below).

image
image1920×1080 156 KB

I suspect the model needs to be closed first, but that’s difficult or impossible with photogrammetry terrain data. I’d be very grateful for any suggestions on how to solve this problem.

2

a workaround might be to add solids to the model to cower holes and then shrinkwrap it before you boolean away the bottom.

It’s difficult to tell from the image what the problem is.

Another option is might be to trim off the part you don’t want and then extract the naked edge boundry and then make a meshpatch of that boundry and then join this to the mesh. (But check direction of the meshpatch before joining, to make sure it points in the right direction.