Update 2 on Exposure Render

There is now a stable release of Exposure Render, the open source direct volume renderer with physically based lighting on the GPU: http://code.google.com/p/exposure-render/

It now even runs on a laptop with a 8600M GT (and all the example datasets fit in the GPU memory). The photoreal lighting makes this renderer stand out when compared to other volume renderers. And it converges surprisingly fast. Some pictures (rendered for only 20 seconds on the ultraslow 8600M GT):