[This survey of 3D graphics programs is taken from a series by Paulo Baptista of OLinux. You will see that some of the raytraced images are breathtaking. To preserve the integrity of the article, I have left it in its original format. Please disregard the "Part II" and the citations of other articles: we will have more articles by Mr Baptista, but not necessarily in the same order as the original series.More articles can be found on the OLinux site, http://www.olinux.com.br (Portuguese), which also has many other resources for Linux users. Work is underway on an English-language site; the Interviews section (http://www.olinux.com.br/interviews) is already operational. -Ed.]