strange effect happen in my model (normal map)

Klo Works

Hi guys,

so I start baking props and I facing strange problem. its something like broken glass !

I use Xnormal 
mikktspace


here the result for baking : 



the normal map feel fine and no problems but when I try in marmoset and unreal I find this problem 



the setup in marmoset is Mikkt /Xnormal

even in unreal got the effect : 



So whats the problem ? did I do something wrong ?


if some one want to test it here the file : 
https://www.dropbox.com/sh/o7v4nt9d183oiby/AADBMPqRZd7hee09zb9Ur_W-a?dl=0

Bek

At a glance it looks like a banding problem, bake at 16bit and drop it down to 8bit with dithering in photoshop

http://polycount.com/discussion/148303/of-bit-depths-banding-and-normal-maps/p1

Noren

Yes, it's a banding problem. I attached the red channel with adjusted levels. 
I'd check if the surfaces in question are perfectly planar and aligned. 

metalliandy

I would say that this is down to banding due to low surface curvature. The flat side showing the error isn't totally flat and the bake doesn't have enough resolution to accurately represent the curvature of the surface. As Bek said, bake at 16bit tiff and then use that (or dither to 8bit if you need 8bit)

Klo Works

Bek said:

At a glance it looks like a banding problem, bake at 16bit and drop it down to 8bit with dithering in photoshop

http://polycount.com/discussion/148303/of-bit-depths-banding-and-normal-maps/p1

I bake most props by TGA in xnormal, and yeah its banding and the problem was not planer.

Noren said:

Yes, it's a banding problem. I attached the red channel with adjusted levels. 
I'd check if the surfaces in question are perfectly planar and aligned. 

True I check it out and find it wasn't planer and also I think the hi poly was bad topology.


after I fix it become better





 I redo the hi poly,fix low poly and I make sure all planar .




and bake again , and the result was good

metalliandy said:

I would say that this is down to banding due to low surface curvature. The flat side showing the error isn't totally flat and the bake doesn't have enough resolution to accurately represent the curvature of the surface. As Bek said, bake at 16bit tiff and then use that (or dither to 8bit if you need 8bit)

I usually bake as TGA and not TIF is it ok ? (or baking by TIF only for some cases like what happen to my model).

I try using TIFF16 bake go to photoshop change to 8> save as TGA24  the result : 




it give me noise effect and not clean did I miss something ? 


file with normal tga + tif
https://www.dropbox.com/sh/ec9fvw3p0lwt8rj/AACULGwPgSf4ubmgiKE8yA3Ca?dl=0



 

metalliandy

The noise is dithering because you are converting from 16bit to 8bit (TGA is 8bit only). You don't need to convert to 8bit to use the Tiff files in Toolbag 2 so unless you specifically need to use 8bit I would use the 16bit Tiff files without conversion.

If you have to use TGA then there isn't much you can do about the noise unfortunately.

Hope that helps

Klo Works

metalliandy said:

The noise is dithering because you are converting from 16bit to 8bit (TGA is 8bit only). You don't need to convert to 8bit to use the Tiff files in Toolbag 2 so unless you specifically need to use 8bit I would use the 16bit Tiff files without conversion.

If you have to use TGA then there isn't much you can do about the noise unfortunately.

Hope that helps

thanks alot   I learn alot today 

just in case here all the answers from metalliandy 







thanks a lot and thanks everyone for help .