Bidirectional Reflectance Distribution Functions (BRDFs)
Red Plastic Sphere [rad file]	Red Plastic Sphere Floating in Gray box [rad file]	Red Plastic Sphere on top of a Blue Box [rad file]
Crystal Sphere on top of a Blue Box [rad file]	Crystal Sphere on top of a Blue Box with White Ceiling and Brown Floor [rad file]	Crystal Sphere on top of a Blue Box with White Ceiling and Brown Floor and looking out the window Multiple rad files pic6.rad sky.rad window.rad outside2.rad
The above are screenshots taken while running Radiance Synthetic Imaging System. All of the rad files were created by following through the tutorial provided with the software. Some links related to BRDF are below. BRDF Explained Rendering with Radiance POV-Ray PovRay Tutorials bv - a BRDF browser Measurement Data Measurement Science for Optical Reflectance and Scattering