Hi there! After a long period of time the source-code of the first 3D-engine based on advanced raycasting techniques has been released on the REX3D homepage. Surf to: http://www.acs-home.de/rex3d/ You can download version 1.35uc of the REX3D demo, WREX the REX3D editor for windows and the complete source-code package for this demo and editor-version! The engine has been written in C, the editor in Turbo Pascal for Windows. CHECK THIS OUT! FREEWARE!!!!!!!!!!!