EMAIL: abuchm7158@aol.com NAME: Alexandre BUCHMANN TOPIC: Elements COPYRIGHT: I SUBMIT TO THE STANDARD RAYTRACING COMPETITION COPYRIGHT. TITLE: Four skeleton polyhedra with spheres COUNTRY: FRANCE RENDERER USED: povray 3.1 beta version TOOLS USED: IRFAN VIEW 2.8 to convert TGA to JPEG. RENDER TIME: 44m HARDWARE USED: Pentium-120. IMAGE DESCRIPTION: This is a composition with compounds of cubes. 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 programmate the followings macros : - rotation : rotation matrix calculation. In entry : one array and one counter. The array contains the data of the rotations and the counter "increments" the rows of the array. Each array's row is the data of a rotation. These data are : X,Y and Z coordinates of a vector, angle of rotation. The direction of the rotation is give by the joke corkscrew law. - miny1, miny2, miny3, miny4. You need these macros to calculate the exact value of the Y axis translation to put a "rotationned" polyhedron on the plane Y=0. The polyhedron is give by the X,Y and Z coordinates of its vertex. The entry data are : - the rotation(s) array(s), - the polyhedron coordinates array.