3DtoAll

MaxToC4D by 3DtoAll transfers scenes from 3ds Max into Cinema 4D in two clicks. It carries geometry and materials across renderers including V-Ray, Corona, Octane, and Redshift, and runs on Windows only.

C4DToMax by 3DtoAll transfers Cinema 4D scenes to 3ds Max in two clicks, handling common import/export issues automatically. It moves models, animation, and materials, including Vray materials and lights, between the two applications.