Brotens3dViewer is a Cocoa Mac OSX application specialized to view Collada 3D files (.dae extension) and runs on Apple computers running OSX, fully respecting the specific technology. Optimized for OSX 10.11 (El Capitan). Brotens3dViewer permits to all to examine geometries and results of the models created and calculated by those Brotens software (Illuminando, Room Lighting Calc) than can export Collada files.