decal not on backside of glass - how?

[Gijs]

What I would like is to have a decal on a glass, without showing it on the inside of the glass. Second question is, why is the decal black, seen from the backside?

[Ryan_Chiong]

hi Gijs,

U can try selecting only the polys wer the decals should appear using select poly modifier. apply UV map on top of it and changing its UV channel to correspond the texture channel of your decal mat. Never forget to use Composite map when applying decals. each map has its own channel.

/Ryan

[Gijs]

Thanks, I also managed (for this simple object) to UVUnwrap it, in that case I don't need a composite map, but I guess for more complicated objects your solution is the way to go.

What's still left is question 2: why is the back of the decal black?

[RErender]

Another aproach would be to have a multisub mat, one with decal applied to the outer faces and a plain glass applied to the rest.

[RErender]

What's still left is question 2: why is the back of the decal black?

Maybe a shadow from the outside letters?

[Gijs]

Another aproach would be to have a multisub mat, one with decal applied to the outer faces and a plain glass applied to the rest.

I tried that at first, but that made the object look solid.

[RErender]

hmm wouldn't expect that

[jacksc02]

gijs- does the map you are using have a stroed Alpha channel?

[Gijs]

The solution with composite maps seems to work pretty good.

Chris, what about the alpha channel? Both the decal and transparency map have alpha channels.

[Gijs]

here an example of it with diffuse, transparancy and bump composite maps.

[DaForce]

nice!!

Care to share some info or possible a scene on how you achieved that.

[CCS]

In the first render, it doesn't look too far from reality. I would imagine that the black "back side" is actually a reflection of the decal. Try disabling reflections and see if it goes away.

[Gijs]

@CCS: No, the decal is on the backside in that rendering, and I think Rerender was right that it was black because of occlusion by the front decal.

@Daforce: I will post the file with decals later tonight so you can have a look.

[DaForce]

Thanks Mate

[Gijs]

Sample file with bitmaps included.

.