CGTalk - Decal with alpha

aazimkhan

09-16-2004, 02:09 AM

hey guys,

i might sound like a total noob with this.
this thing is getting me mad.

check this image first
http://www.aazim.odhn.com/temp/decal.jpg

I have a tiff image as shown, with alpha.
I want only the logo to show, over my metal surface.
but rest of my surface always renders black.... why is it not using the alpha.

I trried connected to useaplah, transparency - nothing works.

EdHarriss

09-16-2004, 02:50 AM

- Is it an LZW compressed TIFF?
- If so, that might be the problem.
- Mental Ray does not support LZW compressed TIFFS.

aazimkhan

09-16-2004, 03:13 AM

thanks edharris for the reply.

but i kept on finding the solution and finally found it.
a very easy and simple way.

so i thought i`ll share it with others too.

-Use a MIX2COLOR node, connect ur Material (phong or lamert etc) into MIX2COLOR`s base color node. (by default its connected to the scene Materials surface node.
-Connect ur texture image into MIX2COLOR`s color1 node.
-Open MIX2COLOR properties and change MODE to DECAL
-Make sure u also tick the Multiply Alpha option.

and this should give u DECAL on ur surface.
from here u can change the surfaces looks by applying textures freely to difuse and ambient , while having the decal texture on.

Sorry about the bad compression of the image below :P.

http://www.aazim.odhn.com/temp/decal2.jpg

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