Weird shader problem

[Gravemind]

Im trying to make a halo3 assault rifle, ive got the model done but it keeps acting weird ingame...
No matter what i do with the shaders and bitmaps it always has these problems:
It either goes all weird like this: (3ds max also does this when i have hardware shading turned on)
http://img441.imageshack.us/i/pic1qq.png (http://img441.imageshack.us/i/pic1qq.png/)

or it has weird random colour differences like this: (mainly on the top of the ar and on the grip)
http://img443.imageshack.us/i/pic2r.png (http://img443.imageshack.us/i/pic2r.png/)

can someone tell me whats causing this?

[Kalub]

Looks like an Alpha channel thinking it's transparent to me.


Remake your shaders and make them just simple (basic diffuse and nothing more) and see what happens.

[Gravemind]

It just went mostly invisible again... Could this be the problem?:
==> !!WARNING!! bitmap with greater than 1-bit alpha being compressed as DXT1 <==

tool says it with all the bitmaps i compile, how do i fix this?

[Dwood]

Change the compression to dxt3 in the bitmap tag, and recompile the real bitmap.

[Gravemind]

I changed it to DXT3 with kornman00 (normal guerilla wouldnt let me) and it just went back to DXT1 when i recompiled it

Edit: I took out the alpha but now instead of being half invisible it has the annoying weird colour difference like in the 2nd pic.

[Choking Victim]

Halo 3 uses the alpha channel as the specular mask. Remove the alpha channel and recompile as DXT1. If your lazy, check the "not alpha-tested" flag in the shader model tag and you won't have to recompile.

[Gravemind]

It still has the random highlights, ill redo the materials in max and try to make the shaders better