topic Re: pre Multiplied Alpha script in 3ds Max Programming Forum

pre Multiplied Alpha script

Anonymous — Tue, 18 Jan 2011 15:29:41 GMT

I'm currently writing a script to identify if any objects in the scene with a standard material that has a diffuse (or opacity map) that have the preMultAlpha switched set to on and if so report it (so I know what material was changed) and then switch it off. Simple enough, only I can't seem to set the switches for preMultAlpha to off and I can't get the opacity map part to work either. (Which is most of the script actually...ahem) Can anyone please help me out. Thank you.

Re: pre Multiplied Alpha script

PiXeL_MoNKeY — Tue, 18 Jan 2011 16:44:44 GMT

This will disable the preMultAlpha switch for all bitmaps in the scene:

for preMult in (getClassInstances BitmapTexture) do (
 preMult.preMultAlpha = false
)

Personally I wouldn't dig through the materials, I would use what I did and change the BitMapTexture Objects. Without seeing your code (and possibly a sample scene) it is going to be hard to pinpoint what the problem is.

-Eric

Re: pre Multiplied Alpha script

Anonymous — Tue, 18 Jan 2011 16:51:39 GMT

Thank you PiXeL_MoNKeY, I see the reason why I was going wrong now:
if dif_map.preMultAlpha == true do dif_map.preMultAlpha = false

Re: pre Multiplied Alpha script

Steve_Curley — Tue, 18 Jan 2011 16:52:47 GMT


$.material.diffuseMap.preMultAlpha
$.material.opacityMap.preMultAlpha

Look up "StandardMaterial - Material" in the Maxscript Help Index.

Re: pre Multiplied Alpha script

Steve_Curley — Tue, 18 Jan 2011 16:53:44 GMT

Eric beat me to it again 😞

Re: pre Multiplied Alpha script

PiXeL_MoNKeY — Tue, 18 Jan 2011 17:06:07 GMT

Just don't hold it against me Steve. 😉

-Eric

Re: pre Multiplied Alpha script

Steve_Curley — Tue, 18 Jan 2011 20:36:23 GMT

As if I'd do a thing like that 😛