EMAIL: abuchm7158@aol.com NAME: Alexandre BUCHMANN TOPIC: Elements COPYRIGHT: I SUBMIT TO THE STANDARD RAYTRACING COMPETITION COPYRIGHT. TITLE: Four polyhedra COUNTRY: FRANCE RENDERER USED: povray 3.1 beta version TOOLS USED: IRFAN VIEW 2.8 to convert TGA to JPEG; EXCEL 5 for calculate values. RENDER TIME: 48m HARDWARE USED: Pentium-120. IMAGE DESCRIPTION: This is a composition with compounds of platonic polyhedra. The desk is from : BADEL ET CIE 249, av. R. POINCARE 83700 SAINT-RAPHAEL FRANCE Tél. : 04 94 95 18 35 - Fax : 04 94 95 26 36 DESCRIPTION OF HOW THIS IMAGE WAS CREATED: The scene has been composed for povray beta version 3.1 for Windows. I use the new function MACRO to calculate rotation matrix. For a precedent version of Povray, I needed EXCEL 5 to obtain the same result. I did not find an equivalent function in the help file of povray. But in the source file MATRICES.C it is a function called : Compute_Axis_Rotation_Transform (transform, V1, angle). To render this file, you must have the two following files in the INCLUDE directory: POLYREG.INC (Platonic polyhedra). On these polyhedra, you can do CSG OPERATIONS. And COL_RDR.INC. This file contains the pigments from RENDERAY 2.0 and it is easyer for me to translate RENDERAY scenes to POVRAY.