Remesh breaks mesh

RayMobula · December 16, 2023, 8:18am

I saw this seems to be an issue from time to time with Blender.

After the Remesh:

Before the Remesh

Remesh settings and Mirror modifier

I’d like to understand what causes this.
In the meantime, I might redo the chest cube. and see what happens.

Cheers,
Ray

FedPete · December 16, 2023, 11:52am

I think it occurs when you have a non manifold object.
meaning somewhere there is a hole in the mesh.
maybe apply mirror …?

NP5 · December 16, 2023, 2:32pm

As said this is usually a result of non manifold mesh, holes in it or other glitches.

RayMobula · December 16, 2023, 5:13pm

Applying the mirror modifier fixed it. Thank you.

(not … see below)

///

Still, it would be interesting to see when this should have happened. I followed the course and didn’t do anything fancy, just 2-3 loop cuts.

Out of interest, before applying the mirror modifier I added and applyed a Remesh modifier, to see if this behaves differently than the Ctrl+R one. It did.

Looks like a toilet seat

Have a creative weekend.
Cheers,
Ray

RayMobula · December 16, 2023, 5:21pm

Nope. The moment after applying the mirror modifier, and then applying Remesh again, it breaks.

I’ll rebuild the cube and move on.

RayMobula · December 16, 2023, 5:31pm

Hmm… there is more going on.

Oh, and all centered objects break when using remesh.

Hmmm

FedPete · December 16, 2023, 5:52pm

Does your half mirrored object inner (hidden) faces?
in your mirror modifier do you merge center vertices on?
Did you use extrude, and maybe then doubles?

RayMobula · December 16, 2023, 7:52pm

These are all good questions.

Maybe when moving vertexes something got messed up. Not sure why this should have happened for all four objects. The head was made from a new cube.
Yes. Clipping and merge. Played with the merge value.
Nope, just loop cuts. And I ran a merge by distance with a pretty wide margin.

I check face orientation too. That’s fine. However, after a remesh, faces area alll over the place, or missing. And there is now inner geometry. Interestingly in edit mode the outer mesh still looks ok. Besides a bunch of new vertices.

Not sure where these verticescome from after the remesh.

I think I messed up at one point. Maybe it is easier to redo the body and log the steps.

Again, thank you for your help - appreciated

FedPete · December 17, 2023, 8:46am

I’ve tried to redo some of this remesh steps involved (if I think so).
Can not reproduce your problem.

Maybe start with a new fresh .blend file and import the trouble some object in the new file to check if it still happens.

RayMobula · December 17, 2023, 8:47am

So, I fixed it. By deleting the parts and starting over. For the middle (green part) I started with a plane, and extruded and scaled it downwards. Ran a merge by distance from time to time, just in case.

I managed to recover the head - by applying the mirror mod 1st, then add the subdivision modifier. And before starting to sculpt, apply that one too - as in the video.

Thx again for all the help.

Ray