The problem I had with this approach was that if I wanted to make specific marks in specific areas, like humidity spots, I'd have to make a mask and colour map, etc with another uvw map. I used this again in the lower walls that have some graffiti. I had this same material and I just added more uvw maps modifiers with it's own channel so that i could map the graffiti correctly. Of course, all together becomes quite complicated to manage and it simply doesn't give me the liberty to make what I want so I just switched to the second technique I used: Composing in PhotoShop all textures and masks that I wanted to use. In 3dsmax i simply had to take a print screen of the object I wanted to texture (like a wall) and paint in PhotoShop the exact placement of the textures. Here's an example:

mesh of back wall pasted into photoshop added a layer of bricks texture

the masked white paint over the bricks and masked humidity draining.

As you seen, this way i know what the result will be more accurately, and don't have to worry too much with uvw maps.
The most hard stuff to texture and get things right was the floor. I wanted to have a tiled concrete floor with some cracks and an entire area that concrete had been broken and only little gravel and pieces of concrete show up. It was difficult because i had to combine very well the various maps that worked in diffuse, bump and displacement channels. I won't put here all the maps I've used to make the masks and colours, since they are many of them, and i dint use all of the whole maps, I used specific areas for masking. Here are the final texture maps:

the displacement isn't very noticeable here.
The only unwrap I had to do was for the paint bucket. I applied a cylindrical mapping to it and used Textporter to unwrap the mesh to PhotoShop. Then mixing some colour maps and adding masks, I got a texture like this. Every map used is from 3DTotal's Textures CD's v5 and v6, except from the paint logo:

Paint bucket textured. Came out very nice to me! I didnt have any corrosion colour map in these cds, so i used one they have that are little brown stones that did the same result :)

The grass was made using adisplacement map with a mask done so that it only shows up in the cracks of the concrete and in some spots where water would fall easily, like the corner and right wall.

Every other object was textured using the same method as described above, so no reason to go on. Let's move into something further. Lighting and Rendering

As I said in the lighting part of "clean" scene, I used Vray to render the scenes. I wanted to simulate morning light, so I only created a direct light with shadows to have sunlight, which produces some hard shadows.
I used displacement for almost every object in the scene, leaving only the metal plates, paint bucket and woods out. This was a major render killer as it actually "killed" my mad 2700 1gb ram two times...yes, it reboot all alone two times!!! And when I finally made it, the render took me 9 hours!
Now I wanted to have a small volumetric light effect to depict the morning haze. I absolutely couldn't do it in the same render I did for the scene. I hide all my objects, applied a volumetric effect to my direct light. I also created a simple radial gradient map with some noise and applied it in the projector channel in my light. The result was a nice volumetric light pass that I added to my original image as screen mask mode.

After rendering my image I opened it in Photoshop and made a few changes, like some brightness correction, noise adding and I added a duplicate layer of my picture and set it to screen mode, and then I made a threshold of it to get a contrasted black/white version of my picture in order to get a soft glow around parts of the picture that are brighter. After that, I just had to blur it a bit.
Here's a wireframe and final rendering:

That's it! I hope you all liked my scenes and this overview, feel free to critic and comment. You have my email :)
2004 Miguel Madaíl de Freitas | Big Spot - Computer Graphics Studio

This image was created using a few of the hundreds of textures from the Total Texture CDs - very comprehensive texture collections priced with the hobbyist in mind. To see more examples, download free
samples and read full details follow this link