Alpha texture

[Rick]

I have a purchased tree model and for some reason the diffuse doesn't have alpha in it, but there is a separate alpha texture for it. Is there a way in LE to use an alpha texture if the diffuse doesn't have an alpha channel in it?

[tjheldna]

This may not help you but if you have photoshop you could copy and pase the alpha into a new layer mask

[Guppy]

Ditto for gimp

[Rick]

Anyone have paint.net experience in doing this? I don't have photoshop and hated gimp but will get gimp just for this if needed.

[AggrorJorn]

I can have a look. send me a pm.

[tjheldna]

If you dropbox them to me I could do it tomorrow if you like? Dont think you can do it in .net

[Rick]

Just send to Aggror. Missed it by 3 mins. Thanks guys for the help!

[tjheldna]

Im typing 1 handed have a baby in the other!

[shadmar]

You can also mod shaders for this which just reads the extra alpha texture and pass it to the fragData0.a

[nick.ace]

Hey Rick,

 

I use paint.net regularly. I imagine that the diffuse alpha texture is just two colors? So the way I would do this is to create a new layer on top of the diffuse texture with the alpha texture. Then, color the alpha part of the alpha layer some random color (preferably something like purple or pink, unless the diffuse is this color ).

 

Anyway, use the magic wand selecting tool to highlight the non-pink portions of the alpha texture and delete those. Next, merge the two layers. After that, just use the wand tool again to select the pink portions and delete those.

 

If you have varying alpha values, then this won't work, and it might be best to write an RGBA merge script or something.

 

Hope this helps!