What is .OCT file extension?
Compiled 3D scene created by Radiance, a ray tracing toolkit; stores objects, materials, and lighting properties for the scene; compiled from a .RAD file using the oconv command line tool, which is included in the Radiance package.
You can see a list of software programs here on easyfileopener.org that can open this file type so that you don’t need to search for it on the web. You can then open your file with this extension using a software listed below.