If you're like me, then you have noticed everyone but you seems to make cool 3D models. I will show you how to make a simple house in google sketchup. You can download google sketchup at their website here: http://www.sketchup.com/intl/en/index.html it is a free, fast and easy 3D modeling software. lets get started!
Step 1: Starting Up
After you've downloaded, open it from wherever you placed it. There will be a model of a person in the middle of your screen, delete it by clicking on it and then hitting delete on your keyboard.
Step 2: The Base
Now, on the top of the screen there are a bunch of icons; click on the one that looks like a square. With this tool you can make rectangles and squares, drag it to make the base of the house. Now click on the icon that shows an arrow coming out of a rectangle, it is the extrude tool. Click on your rectangle and drag it to the right height.
Step 3: The Roof
Now click on the pencil icon, it is the draw tool you can use it to make lines. Click where it says center on the edge of the house, make this line as tall as you want the roof to be. Then from the two edges make lines to the top of the center line (see picture) repeat these steps on the other side. To complete the roof make a line that joins the two points together (see picture 2)
Step 4: The Chimney
Take out that rectangle tool again, and make a rectangle on the roof where you want the chimney to be. Then use the draw tool to make four lines coming up to the same height and then connect them to make a chimney shape, this chimney looks pretty good but we can do better, draw four lines around the rim (see third picture) then use the extrude tool to push the smaller rectangle inside (see picture four)
Step 5: Painting
Now you have the basic shape, you can add any details you want, I added a simple door and window. Click on the paint bucket tool at the top, paint your house however you like it. And you're done, you can give yourself a pat on the back you have made your first 3D model.
I'm entered in the 3D design contest, so if this was helpful to you please vote for me!