Alpha issue 3Dsmax 2012/Unity

tigerheart

Hi, I am lurking on everybody's work since a while, (especially the waywo thread) and now I am asking a question:

I am working on a character in 3Ds max 2012 sp2, I modeled a guy with a few polygon with alpha transparency, and there was a first problem. Some of the polygon seem to have normals reverted. I switched from nitrous to direct3D, and it seems that it worked fine. But it failed again in unity.
The texture is a TGA with an alpha layer...

Thanks for your help

parallel

what shader/ material are you using in unity?

kosmoski

Did you try to reverse normals?

tigerheart

thanks for your answer.
in unity it's the default transparent/diffuse shader.

parallel

are you sure the normal is pointing outwards? (I usually check with the show normals in editable mesh)

Farfarer

If you want it to be semi-transparent, you'll need to use a separate material for the parts that are to be that way. You're running into sorting issues.

Otherwise, use the cutout rather than transparent shaders - i.e. Transparent/Cutout/Diffuse - that will use alpha test and it'll sort fine.

tigerheart

yes, I am sure the normals are clean

tigerheart

well, I have only one material for this, and the cutout is not precise enough...

cupsster

maybe the way you welded vertices together can caused this.. Try to do STL check in max and reexport.. It helps sometime.

tigerheart

did the STL check, there was only 78 errors...butit was only the open edges, so it's a dead end...

Fizzly

Did you try to 'Reset XForm' the model before exporting? Utilities -> Reset XForm
Also try viewing it in 3ds Max with the option 'Backface Culling' turned on. This helps to see if the normals are incorrect when modelling

Farfarer

tigerheart wrote: »

well, I have only one material for this, and the cutout is not precise enough...

Then you need to apply a separate material to the transparent parts of the mesh and give them the transparent material in Unity and leave the rest of it as standard opaque diffuse.

You'll still get sorting issues with the transparent bits, but they won't be quite as bad.

tigerheart

all right I'll try that. i let here another screen of 3DS with the problem if there is a solution about this one...

thanks all...

Farfarer

It's the same issue and the same fix for 3DS Max and Unity.

tigerheart

Thanks for your help all, it work fine now...