These maps create reflections and refractions.
Themap produces a material that reflects surrounding objects when it is applied to a collection of coplanar faces. You assign it as a material's .
Raytrace map provides fully raytraced reflections and refractions. The reflections and refractions it generates are more accurate than those produced by the reflect/refract. Rendering raytraced objects is slower than using Reflect/Refract. On the other hand, Raytrace is optimized for rendering 3ds Max scenes, and you can further optimize it for your scene by excluding specific objects or effects from raytracing.
The Reflect/Refract map produces a reflective or refractive surface. To create reflection, assign this map type as the material's. To create refraction, assign it as the .
Thin Wall Refraction simulates the "jog," or offset effect, you find when you view part of an image through a plate of glass. For objects that model glass, such as a Box in the shape of a window pane, this map is faster, uses less memory, and provides a much better visual effect than the Reflect/Refract map.