You might also want to read a bit about PDL - the Perl Data Language, as it is used often to perform efficient 3d graphics computations. There is also a OpenGL interface for PDL called PDL::Graphics::OpenGL.

What exactly are you trying to do? How complex are you wanting this to be? Do you want something simple -- similar to a GIF or Flash animation? Or do you want high-resolution, fancy 3D letters with dynamic lighting effects, performing complex acrobatics? How is it going to be viewed? On a web page -- through a browser? Is it encoded as a video file? Or are you writing an application to render and display the video?

Perl OpenGL (POGL) would be a good choice for complex 3D graphics. SDL::OpenGL is another option, however POGL tends to perform better in benchmark tests. Here is an excellent series of articles on 3D graphics programming in Perl:

Building a 3D Engine

If you just want simple animations check out some of the SVG modules for Perl. And there is a book on this by the way -- "Graphics Programming For Perl" from Manning Publications, which I have not read, but which has decent reviews. Here are some links for SVG:

Introduction To Scalable Vector Graphics
Creating Scalable Vector Graphics With Perl

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