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As I'm sure you know by reading this post's name, I have a few different questions about 3D, and I figured it would be better to put them all into one post instead of make 2-3 posts all at once.
So here are my questions :

Is their a way to get the Z position of the mouse? I know the mouse doesn't actualy go "into" the screen, but I have your typical RTS game view, and I want to use the mouse to select units on-screen. The problom is, I can't find out how "deep" into the screen the mouse is, so if you click the mouse and it has an x value of 60 and y of 60, then all units with those values would end up being selected, even if some of them were off-screen. I have seen a few things about a PICK OBJECT command, but I have no idea how this command works, or if it is included in dbc(which is what I am using)

Next question :

I have a model, made and painted with calagari truespace 3.2. When the model is loaded and the screen resolution is set at 640 by 480, the model keeps its paint information from calagari, but it doesn't on higher resolutions . The model is saved as .x. I would really like to have resolutions above 640x480, but not if I have to make textures for all the models in my game.

Please keep in mind that I am fairly new to using 3D commands, and that I am using DBC.

All help is appreciated, thanks.

the z position of the mouse is the scroll wheel if im not mistaken

Well dang, your probably right. I hadn't thought of that. Hmmmmmmmmm....I'v been thinking about what I could do if the mouse Z couldn't be gotten(or, as IanG pointed out, it is the scroll wheel) and this is what I came up with. **I take the camera X position, and then based on the mouse location I add or subtract an amount(IE how far from the camera center the mouse is) and then I do the same for the camera Z, only I use the mouse Y location to check that.** The part of the message inclosed in ** no longer matters. I thought about it and realized that it could never work

You're spot on about the mouse not going into the screen so there's not a "real" Z position, but I think you're also on the right track with your PICK OBJECT idea. By putting some "place holder" objects into your 3D scene and finding the closest to the mouse and grabbing it's Z position, you should have a good idea how "deep" your mouse is. I'm afraid I haven't memorized which PICK commands are supported in Classic though (I'm using Pro now), so I've got to refer you to the dreaded manual and it's non-alphabetic (!%$!%#$) command listings

Sadly, I am pretty sure I read that PICK OBJECT and PICK SCREEN were dbp commands, and not in dbc. The "place holder" idea might work, just let me make sure I understand what it is your saying. Basicly, I would place a bunch of invisible objects around my playfield, and when the user clicked the mouse, I would check which one is closest to the camera, therby giving me something close to the current "Z position" of the mouse. I'll need to use some math to figure out how far infront of the camera the mouse was clicked, but that can only be so hard, can't it