The most powerful 3D modelling system for the Amiga is » probably Sculpt-Animate 4D Professional (£368.00 Byte By Byte Amiga Centre Scotland 031 5574242). It uses the same basic interface as all the Sculpt series, three windows corresponding to x, y and z or up down, east west and north south. The commonly used gadgets are small icons around the windows, other tools are on menus. SA4D has many new modelling tools including helical spins, and the ability to build and store macros. Its rendering and animation tools are discussed below. The best stand-alone 3D modeller is Modaller 3D (£69.95 Aegis Precision Software 01 330 7166). Again the traditional three windows are used for the three elevations, but a fourth is added to view the complete solid model. All of the normal sculpting tools are provided including lathe (spin a profile) and extrude, plus geometric primitives, layering etc. Modeller 3D is not a 3D CAD system but it is probably the closest thing we have yet on the Amiga. A recently developed technique in professional computer modelling is the use of SURFACE PATCHES. Normal modelling methods tend to look rather mechanical so organic shapes are difficult to produce. Surface patches allow complex multiple curves to be created from a few curved lines. Forms In Flight II (£79.00 MicroMagic Amiga Centre Scotland