I'm gonna piggyback on what Colter talked about. There are several different media to "render" a vehicle.
Obviously, if you can draw free hand, markers, paper and chaulk are relatively cheap. Then you can move up to airbrush which is basically the cost of the compressor, gun, paints, etc. Of course, the only way to reproduce and share this artwork is to scan/photograph the piece so that it's now a digital file.
Then you can also render digitally with an artwork program like Adobe Photoshop and Adobe Illustrator. They take a while to master and also cost in the hundreds to buy the software. There's several ways of getting the basic linework into these programs to render them. You can draw free hand, use a Wacom tablet (BIG BUCKS!) or you can find a good photo and trace the lines and shapes with Illustrator. You can either render in photoshop or illustrator.
Finally, you have 3D software. Unless you can get a program through work, an online Student trial seat or elsewhere, you're gonna pay in the thousands! You can chose from several packages like: Rhino, 3DSMax, Maya, SolidWorks, Alias or others. The seat of Wavefront Alias Design Studio we have at work was $25K but you can get What Kris Horton uses, 3DSMax ( I think), for under $5K.
These are very powerful packages that are fun to use once you figure out how to use them. They are a major pain to learn how if you have no prior 3D modelling experience.
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