Ok. Thanks.

Actually, i have to decide if i want to use image OR color (except for
ambient) ?

"emissive" is a color that is emitted by an object (like a light bulb).
If it's not clear enough, you can find some informations here:
http://fly.srk.fer.hr/%7eunreal/theredbook/chapter06.html

For transparency, do i have to use (or can i use) a image with alpha values
(such as .tga) ? It's very boring.  I would have to use "The Gimp" each
times i want to change to transparency value of my images?!

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