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Converting CAD-data to quad meshes with propper edge flow?
show user profile  Nanne
Has anyone got experience with converting CAD-data (i.e. cars and product models) into low-res quad-meshes with proper edge flow so that TurboSmooth can be applied to it afterwards with good result?

Usually all CAD-data I get is triangulated so subdividing the mesh does not end up well. Some times the triangles are very thin and long as well, resulting in shading issues and sometimes streached reflections in the rendering.

How do you prep your CAD-data for rendering and animation in 3ds Max? Do you use any plug-ins or do you do it in a seperate software? Or do you remodell the whole thing with retopology tools, like TopoGun?

I find it a bit strange that these surfaces that are defined by lines can't be more propperly turned into quads rather then triangles.

Kristoffer Helander
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read 398 times
3/30/2017 10:04:19 AM (last edit: 3/30/2017 10:04:19 AM)
show user profile  Sangre
Sometimes I'm getting a job where I should optimize a CAD mesh. By "optimize" I mean remodel the whole thing from scratch. I think if such tools existed nobody would bother hiring people to do this.
read 394 times
3/30/2017 11:53:37 AM (last edit: 3/30/2017 11:53:37 AM)
show user profile  9krausec
Different types of data.

Polygon vs Parametric which is more in-tune with nurbs data. If you want to convert to a cleaner mesh, import IGES / STEP into 3ds Max as nurbs (I believe you can do this in 3ds).

Then you'll need to carve out a better looking poly mesh which will take time. To me, that sounds like a hassle, so I choose to-

Import with a program called Polytrans by Okino software. Works a treat and reasonably priced. This allows me to import native solidworks files and RETAIN their appearances for texture breakouts inside of Maya.

If I didn't give two hoots about breaking things out of imported CAD data, then I'd use IGES / STEP route. Rhino 3D is another solution for converting data.


Edit: And use round edges in your rendering software if it is available. (VRay has it, Redshift has it, Assuming Corona has it... standard these days I'd think).

- Portfolio-

read 372 times
3/30/2017 5:42:17 PM (last edit: 3/30/2017 6:03:42 PM)
show user profile  FX
zBrush, nothing else can touch it for auto retopo/edge flow, it still leaves you wanting at times and sometimes requires a lot of post work to clean up.

It's good but it's far from perfect, R8 is supposed to be even better, but god knows when we're going to see that surface.

I too am amazed we are still dealing with meshes at this level, and things aren't more automated and results more precise, nothing seems to have advanced over the years.

Most software these days has some kind of auto-retopo, but results vary and are nowhere near as refined as zBrush.
read 361 times
3/30/2017 9:09:15 PM (last edit: 3/30/2017 9:09:15 PM)
show user profile  9krausec
I'll just leave this here too. Looks interesting and I plan to check it out in a month or so.

- Portfolio-

read 338 times
3/31/2017 6:50:52 PM (last edit: 3/31/2017 6:51:41 PM)
show user profile  Nanne
Thanks for the tips 9krausec.
I will check out Polytrans, but the last link you posted looks really interesting! Check it out!

Kristoffer Helander
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read 330 times
3/31/2017 10:20:47 PM (last edit: 3/31/2017 10:20:47 PM)
show user profile  FX
I thought you wanted true subd with proper edge flow.
read 327 times
3/31/2017 10:41:22 PM (last edit: 3/31/2017 10:41:22 PM)
show user profile  Nanne
Well, yeah, alright, the edge flow in these models can be questioned. But still, 375million triangles converted to quads with, at least, decent edge flow, in less then 10 min. That's gotta be better then the messy triangulated meshes I've seen of car models from CAD.

It looks like you can also draw guide lines for the edge flow to help it along. It might not be perfect, but it might be a really good starting point.

Kristoffer Helander
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read 323 times
3/31/2017 11:30:16 PM (last edit: 3/31/2017 11:37:13 PM)
show user profile  9krausec
FYI polytrans will give you polygon soup. So if you don't want that then PT isn't for you.

- Portfolio-

read 317 times
4/1/2017 12:35:19 AM (last edit: 4/1/2017 12:35:19 AM)
show user profile  Nanne
Thanks for the heads up! I was looking for sample images on their website for the end result but couldn't find much, so thanks for sharing.

Kristoffer Helander
  :: Works ::   |  :: Resumé ::   |  :: Contact ::   |  :: CG Blog ::   |  :: Links ::     
read 306 times
4/1/2017 11:43:32 AM (last edit: 4/1/2017 11:43:32 AM)
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