manual

The main difference between A5 and A6 mode is the handling of polygon coordinates and lighting. A5 used its own highly optimized algorithms for lighting and for converting polygon coordinates into screen space. A6 uses the DirectX algorithms for this, thus omitting the software world->screen conversion and lighting step. For this reason the A6 renderer is a lot simpler than the A5 renderer, but offers more features and can use T&L hardware. Very old 3D cards without multitexturing (weak or slow cards) are not supported by A6.

Lighting:
A6 supports up to 8 point, spot or directional dynamic lights. The DirectX lighting used by A6 does not look as smooth as the A5 lighting, but offers more features and control possibilities. Dynamic lights now affect all polygons of a model separately, not just the model as a whole. The new A6 material parameters give more control over the light reflection properties than the old metal, ambient, or albedo parameters of A5.