1
$\begingroup$

I have an odd situation with an object converted from a .wrl file of a Minecraft building. After remeshing to make the object manifold, it seems to have created a "hollow" object - that is, there is an outer facing layer on both the outside and inside of the object. This is kind of confusing so here are some images:

Here is the bottom corner of the building from the outside. "Outside" facing parts of the faces are highlighted in blue by Blender for clarity. Exterior

And here is the bottom corner of the building from the interior. Notice it's still blue, which means there's another layer of "outside" faces pointing inside the building. enter image description here

Finally, here is a GIF of me going from the exterior to the interior of the building from the bottom a couple times. Notice the red coloring signifying the inside pointing parts of the faces. enter image description here

My guess is since Minecraft is made of blocks, it's considering the inside of a block to be the "interior" and every face of the block touching air the "exterior", including the faces that are facing the inside of the building. I think this is why when passing through the floor, it showed red.

My goal is to 3D print this building, so I am only concerned about the surface of the building itself. I don't care about its hollow interior. In fact the hollow interior should be infilled by the slicer program, which it is currently not due to this issue.

How can I either make the imported building manifold to begin with so I don't have to remesh at all? (I've tried a handful of things to no avail here like merging vertices by distance, the 3D print toolbox addon, etc.) Or if that's not possible, how do I get rid of everything except the surface of the building - any faces touching 'air' so to speak. The mesh should just consist of what is visible from the outside. Any solution to get this object 3D printed is fine with me.

Thanks!

Edit: I'm linking to an example of a smaller imported Minecraft build with identical problems (one seen in pictures above is too large a file): .

Improve this question
$\endgroup$
10
  • $\begingroup$ There are a great deal of inner faces within the "hollow shell" - look inside this top of the dome tower - there is a second floor. Inner faces like this will confuse blender. $\endgroup$
    – Christopher Bennett
    Commented Dec 24, 2022 at 2:13
  • $\begingroup$ In edit mode, try hovering your mouse over a face on the inside and hitting L If it selects all the inside faces only you can simply delete them $\endgroup$
    – Psyonic
    Commented Dec 24, 2022 at 2:18
  • $\begingroup$ Right, there are interior faces all throughout which seem to equate to the inside of Minecraft blocks. How can I get it to ignore the inside of the building and just consider the outer surface? $\endgroup$
    – NDrummerboy087
    Commented Dec 24, 2022 at 2:19
  • $\begingroup$ Psyonic, thanks for the response. It seems to select a disorganized mix of both in my case $\endgroup$
    – NDrummerboy087
    Commented Dec 24, 2022 at 2:28
  • 1
    $\begingroup$ Harry, I totally agree. I’ve tried so hard to find a way to do this and at first I thought it would be easy since it seems like such a basic and common case. But I guess I was wrong. $\endgroup$
    – NDrummerboy087
    Commented Dec 24, 2022 at 16:28

0

Reset to default

You must log in to answer this question.

Browse other questions tagged .