I understand you're looking for information about — likely referring to a PDF version of the classic textbook Procedural Elements for Computer Graphics by David F. Rogers.
Here is an informative overview of the book, its content, and your options for accessing related materials legally and freely. Author: David F. Rogers Published: 1985 (first edition), with a second edition in 1998 Significance: A foundational textbook in computer graphics, bridging mathematical fundamentals with practical rendering and modeling algorithms. Procedural Elements For Computer Graphics Pdf Free