Baking issue with substance Painter

Alecc

Hey guys,

I bake oftne with substance Painter, but with really simple mesh, I've an issue... the bake is totally wrong...



the HP has nothing particular.....



Usually, this issue is the wrong Groupsmooth but here, 1 UVISLAND = 1 Groupsmooth
I tried with a unique groupsmooth, same result...



No overlapped uv, no invertex poly, all is reset X formed...

I'm out of idea.... and you ?

Thanks, and have a nice week

Obscura

Could it be the pieces touching the edge of the uvmap (zero padding)?

Alecc

hey !

Nop, I tried with more padding


Same result  

lp and hp are here : 

https://wetransfer.com/downloads/2d2175cb11e636b4d7fbe768c562be8d20200329221247/af1d7cf330df5e0c636433d80f14473d20200329221311/0483b6

Obscura

I did a quick test and its full of with seams on my end too. Try exporting the mesh with different tangent settings.

Alecc

I tried. I tried to unify normals, break and reset, export with binomial and tangeant etc.... no result...

rollin

I would say the issue is bc of the long and thin nature of the model and your UVs

- The ray distance needs to be high enough (as you are probably baking "relative to bounding box") 
- And the texture resolution needs to be high enough to really capture the curvature of the edge. Below 8k you'll notice the seams

Alecc

huuu ?

8k ? you said me we can't bake this very simple mesh without 8k map ?????

Relative bounding box is check, if I uncheck it, the baking is totally wrong. When I keep it,  and increase the Max Distance, it"s similar result.
I tried in 4k resolution, and the seams is always visible

rollin

Jep, in 4k it's visible. 
It's no the simple mesh which is requiring an 8k map. It's because of the UVs.

There are two routes you could walk. 
- if this is all on your map take a non-square map, re-use texture space, etc. Whatever you do you have to increase the texel resolution or you will keep failing
- don't use a normalmap to define the edges of the mesh and just model them and use a normal map only for detailing / material definition

Alecc

yes but the final baking will be with a lot of mesh, and it will be a square.
so you suggest to me to mid modeling this parts ? 

rollin

In this case it probably makes more sense, yes.
Maybe if you add some more rounded edges on the lowpoly the texel resolution can sustain the reduced change in normal direction bit better too. You'll see. 
Maybe the seams are even a non issue after applying a texture and in respect to your actual viewing distance for the end product. 

Anyway.. the answer to your question is: your current setup requires an 8k map to get enough texel density for the normalmap to avoid any visible seams.

Obscura

Well. In that case I'd reconsider the whole thing. a 8k normalmap is almost 100 mb of videomemory. It really doesn't worth it unless this is some hero prop or something. Maybe add some chamfers instead of using a texture. You are only baking soft edges anyways.