Some parts are still worth reading, but a lot of it is dealing with rendering without any real acceleration. Some of the low level parts on optimisation may sti

Some parts are still worth reading, but a lot of it is dealing with rendering without any real acceleration. Some of the low level parts on optimisation may still be worth reading, as are the BSP chapters, but you should read more modern books on optimising code, and on spatial indexing schemes of various types as well. For the pure rendering side I'd say Real-Time Rendering (third edition) gives a good overview of techniques, but you'll want to look elsewhere if you want to see how those algorithms can be really optimised for a given API and GPU.