Making unphotographed bottom of 3D models solid

ShadowTail wrote:

Set your reconstruction region in such a way that the bottom of it is at the level you want the object to be closed at.

Then do your reconstruction.

RC should generate a closed, watertight mesh automatically.

I’ve tried this an not succeeded. Here is an example of what’s frustrating me in a model I just made. It looks “open” from the bottom when in reality it is not.

https://sketchfab.com/models/89ecb7e7e8 … 331a9582e2

At what stage in the process should I be setting the reconstruction region to cut off the parts I don’t want and “seal off” the model so it doesn’t appear like you can just look inside it?
I’ve been doing it thus far post-texturing. Should I be doing it earlier? I save it till then normally because I’m not sure until nearly the end which parts of the model I do and don’t want to keep. I often use the filtering tool to cut off bits and pieces, but doing this seems to “open up” the model to be able to peer inside it.