Basic Image-Based Lighting

Today I've been working on a basic Image Based Lighting. I'm using simple BMP files (8bits per channel) as a light source comming from a globe around the scene with an infinite radius. I was inspired by the works being done by Paul Debevec, but I didn'r read any of his papers yet. This was a simple, intuitive implementation, based on what I think Image-Based Lighing (IBL) is. Here are two renders produced with a simple scene inserted in two different lighting environments:

(Scene inside Grace Cathedral, San Francisco - click to enlarge)

(Scene inside Eucalyptus Grove, UC Berkeley - click to enlarge)

Both images were created from two HDR images from Paul Debevec's Light Probe Image Gallery.