When I say CGI I mean Computer Generated Image.
If you don't mind tackling a somewhat steep learning curve, Blender may be the solution for you. It's a free open source software that does what I think you want to do. Also, in interest of keeping up with acronyms, CGI as you are using it has been changed (in so far as I am aware) to CG so as not to be confused with the Common Gateway Interface (or CGI)
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there's Blender (www.blender.org), also gmax (www.turbosquid.com/gmax) offers a free 3D modeling application , its basically 3d studio max without the rendering capabilities. Used mainly for game content creation.
Click your start button, accessories, and then paint.
You can now create computer generated images.
I assume you're trying to either a) do special effects for a live-action video or b) do 3d animation. While they can be one and the same, they're most often not.
Which is it?