bumpmap

I am making a map with some bumpmapped materials, and decals/overlays don't work on it. So I thought of a work around to make a nodraw func_illusionary with the top textured. I just want to quickly ask, is it okay if I move it using the Transform tool 0.5 or 0.25 units down? I know about the...

I'd like to up my texture creation game with bumpmaps and normalmaps. My problem is that while I know of these things, I'm rather foggy on what the difference between them is and which to use when. Secondly, some form of tutorial on how to create both bump and normal maps would be appreciated...

Includes: Brick/brickwall004_fix Brick/brickwall004c_fix Brick/brickwall004d_fix Brick/brickwall004e_fix which are identical to their sans _fix counterparts but with less noisy bumpmaps taken from brick/brickwall002 in an attempt to reduce the visual clutter that the original textures cause.