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Shrink wrapping a shit mesh
show user profile  herfst1
Hey all, been racking my brain trying to make a holy (as in, not religious, but full of holes... actually kinda religious, when you think about it) mesh from a completely destroyed CAD file.

One technique that kinda works is to dump it into zbrush and add a sphere subtool, which you push and project into the same shape, then zremesh. But with the projection stage it sometimes gets a bit confused and doesn't work 100% properly. I've tried dynameshing and decimating and capping holes and fixing mesh but non of those options work.

So I'm thinking of using max instead to shrink wrap a sphere (or whatever) onto the holy mesh and, bam, problem solved. Thing is, I don't know how to do it.

First thought is to use the cloth modifier and give it -100% pressure. But the end result is crap (though I'm not an expert with the cloth modifier). Plus that technique would only work on a pretty simple mesh that didn't have loops and holes (that are meant to be there) and all.

Anyone have any ideas on making something watertight? And, no, welding verts isn't an option in this case, it needs to be 100% the exact same volume.
read 938 times
4/24/2014 6:10:11 PM (last edit: 4/24/2014 6:10:11 PM)
show user profile  Mr.Burns
Could you post an image of the holy object?
read 928 times
4/24/2014 6:12:52 PM (last edit: 4/24/2014 6:12:52 PM)
show user profile  Nik Clark
There is a tool in Max to build a new mesh over another one. It's in the Graphite tools. Can't remember what it is called or how to use it though. There was a video on it on Youtube.

read 927 times
4/24/2014 6:13:52 PM (last edit: 4/24/2014 6:13:52 PM)
show user profile  Nik Clark
Not sure if it will help you, but here it is.

read 912 times
4/24/2014 6:56:35 PM (last edit: 4/24/2014 6:56:35 PM)
show user profile  LionDebt
Not sure what your starting mesh or intended end product should look like... post an image or two?

Is it a destroyed CAD file you want to 'rebuild' and the end product is generally quite 'holey'?


Is the destroyed file output a perforated, 'holey' mess that you want to retopo with nice clean geo?

read 894 times
4/24/2014 9:41:27 PM (last edit: 4/24/2014 9:41:27 PM)
show user profile  BishBashRoss
Blender has a pretty sweet shrink wrap tool.

read 891 times
4/24/2014 9:56:29 PM (last edit: 4/24/2014 9:56:29 PM)
show user profile  herfst1
@ Burns, I'm not allowed to post an image of it but imagine a f1 ferrari broken up into 1 million chunks, with each chunk having it's own cut up pattern.

@ Nik, yeah I've been playing with the graphite tools but I really need an automatic result for watertighting the mesh without retopologising or changing the shape at all, as once it's watertight then I can chuck it into zbrush and zremesh it in about 5 minutes (exaggerating).

@ LD, yeah, I want to make holy things unholy.

@ Ross, excellent!!!! I will do some research into that. Cheers.

read 876 times
4/25/2014 2:14:21 AM (last edit: 4/25/2014 2:14:21 AM)
show user profile  K-tonne
you could 'patch' the mesh in zbrush but i think it would take a little longer than you'd like
the process involves putting a low poly plane (for a flatish surface for example) over the hole then merging visible (hiding everything else of course) to make a single mesh that will allow a retop

Website and Portfolio

read 870 times
4/25/2014 2:43:03 AM (last edit: 4/25/2014 2:43:03 AM)
show user profile  herfst1
Interesting. I will see if I can get that working for me. As I said earlier I can make a sphere and push, warp and project it in place, so maybe once that's done nicely I can merge then go from there. Cheers K-tonne.
read 866 times
4/25/2014 2:51:36 AM (last edit: 4/25/2014 2:51:36 AM)
show user profile  digital3ds
confused - since zRemesher is going to change the topo anyway, why not just re-topo from the start? then the mesh will be watertight and you don't have to zRemesh

ah, to try saving time in retop - a complete Ferrari wouldn't be to fun to re-top, assuming there's all the bits and pieces to it 8 /

- Mike Sawicki

read 857 times
4/25/2014 5:05:42 AM (last edit: 4/25/2014 5:10:21 AM)
show user profile  herfst1
Yeah, it's a bit confusing. Basically projecting and zremeshing works fine about 95% of the time. The problems occur when the mesh is tight (e.g. with a thin plane, or sharply curved, really tight bend), the projection gets confused and sometimes projects to the backface.

I've got no problem sorting this stuff out manually but I'm trying to create a new workflow that's full-proof so that even Forrest gump can do it.
read 850 times
4/25/2014 5:18:48 AM (last edit: 4/25/2014 5:19:14 AM)
show user profile  FX
Don't know if these are too basic for your needs, but might be a good starting point...there are a couple of wrap tools in the TiM-Scripts package.

I also found a tool called Quick Topo inside Rappa Tools, it looks like a similar process but more refined...

Checkitout at 6:15

I'm not sure how good this, I haven't really played with it much.
read 814 times
4/25/2014 11:55:09 AM (last edit: 4/25/2014 11:55:09 AM)
show user profile  herfst1
Thanks for the links FX, that Rapid thing is pretty cool, though would take a while to learn the workflow, still, I'm interested in trying it out, got some good show-off abilities.

Looking at it further I think shrink-wrapping will not give me the exact result I'm after no matter how good the tools are, 'cause say I want to shrink wrap a torus knot, I don't think it will ever be possible.

I am trying out K-tonnes merging subtools in zbrush and I think it's the way to go. I spent about 30 minutes sculpting and projecting a sphere into the right shape, decimated then merged it with a duplicate of the original before zremeshing and it worked... but would still need another 30 mins or so to get 100% the perfect result. Still, 1 hour isn't long at all compared to a lot of other techniques. Sure, topogun might be faster (or not) but it's not an option as my company won't invest in licences for something like this, they'd just say, "Do it old school then."
read 792 times
4/25/2014 2:02:08 PM (last edit: 4/25/2014 2:03:13 PM)
show user profile  herfst1
New idea: Say I select all the faces and shrink by local, is there a way to bridge between them? Here's a picture of what I'm dealing with (yeah, fuck it, said I wouldn't post a pic but I am anyway).

P.S. I've exaggerated how much I'd shrink the faces to make the picture clearer.
read 782 times
4/25/2014 2:32:25 PM (last edit: 4/25/2014 2:33:12 PM)
show user profile  Boomer
Can you explain what I'm looking at here? What's the green object v. the red?

  Mathew Kaustinen

read 746 times
4/25/2014 9:20:08 PM (last edit: 4/25/2014 9:20:08 PM)
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