This blender 3d radiosity tutorial will teach you how to work with radiosity and how to apply textures after the radiosity process is finished. Matthew R. Duncan as the author says “I assume that you are already familiar with creating meshes, applying materials, and have a general understanding of the Blender interface. While you can certainly use your own scene for this tutorial, I have provided my Raider mesh below as a starting point.”
During the late eighties and early nineties, radiosity was a hot topic in 3D computer graphics. Many different methods were developed, the most successful of these solutions were based on the “progressive refinement” method with an “adaptive subdivision” scheme. And this is what Blender uses.
Blender Radiosity Tutorial 2 Link