Actor dot3 bumpmapping+alpha-can it be done?

Veleran · Post by **Veleran** » Sun Feb 04, 2007 1:41 pm

I used dot3 bumpmapping to an actor that uses as a BN0_texture
a .tga with alpha for transparency.

The result is when i add the extra BNB_texture material the actor loses the transparency,and the transparent parts show black in th e level.

I also tried a .tga with alpha for the extra Dot3 material but the result is the same black with no alpha.
Does anyone know anything about it?
I thought dot3 bumpmapped actors could have transparency.
If there is a way to do it-tell me.

Juutis · Post by **Juutis** » Sun Feb 04, 2007 1:55 pm

Does the actor have transparency if you don't use bumpmapping?

Veleran · Post by **Veleran** » Sun Feb 04, 2007 3:50 pm

Yes,without dot3 bumpmapping the alpha channel of the .tga diffuse map has the right transparency.

Juutis · Post by **Juutis** » Sun Feb 04, 2007 4:46 pm

Allright. I haven't really used dot3 bumpmaps, I've only tested EMBM with not-so-great success. So unfortunately I can't help on this one.
I'm sure one of the veterans will, though.

BLACK_PHOENIX · Post by **BLACK_PHOENIX** » Mon Feb 05, 2007 7:14 am

the bump map is interfering with the alpha?

is the bump placed where the alpha is. if so you should try to use a multi layer texture and use your normal tex and alpha and bump.

and you could instead of using alpha you can make all the transperent parts pink.

this is strange as i never get any problems doingh this.

Veleran · Post by **Veleran** » Mon Feb 05, 2007 1:38 pm

It is very possible that the code for dot3 actor bump mapping is nt yet 100% finished.
I used to the BN0_base a .tga with grayscale alpha on.

And i cant place the colors of the dot3 bumpmap to the alpha channel-
the alpha is grayscale only.

And the alpha channel is for transparency only,andis taken account on the base BN0_ .
Transparency is just ignored when you use dot3 extra materials,and for the moment i wont use transparency on the dot3 bumpmapped actors.

Veleran · Post by **Veleran** » Mon Feb 26, 2007 11:00 pm

I was hurring when i wrote that the code is nt finished.
I read at the change log of December 29/2002 this:

12) Removed the per-pixel transparency due to texture quality problems.

Dot3 use per-pixel lightning.
Is this the reason perhaps?-what do you say?
use plain non-dot3 materials for the hair and other transparent textures?