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Well, you'd either have to go into the local options for the raytrace reflection map, and choose to use the antialiasing options there... if you're using 5.0 or higher, to enable antialiasing, first you have to open up the render dialogue, and then switch the tab over to raytracer. Under Global Ray Antialiaser, turn it to On, either setting there will work, don't bother changing it further. Now in the material options for your raytrace map, under raytrace paramaters, and Raytraced Reflection and Refraction Antialiaser Settings... You can leave it at as Use Global Antialiasing Settings, or you can use the pulldown list to choose from the different antialiasing types, as a local option, which then you can choose the settings for that individual material's raytrace antialiasing.
Alternatively, you can just use supersampling on the material to get by with basic smooth reflections.
Just use the material options to disable Use Global Settings under the SuperSampling section. Then you can just enable Local Supersampler "Max 2.5 Star" and that should be good enough for most reflections looking nice
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