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Sony made a lot of good decisions when it comes to the technical design of the PS4. It’s awesome to have a fast, featured-packed GPU that can access a huge amount of fast memory. The Xbox One isn’t a whole lot different, but the slower memory and the irritation of still having something like eSRAM are disappointing.
C4 is currently exclusive to the PS4 for the sole reason that Sony was much more cooperative than Microsoft when we were first exploring conversion to next-gen consoles. Sony treated us with respect and made sure that we had everything we needed to get C4 running on the PS4. Microsoft did not respond to us in any way that included the slightest bit of professionalism, and that’s just one more thing to throw onto the pile of PR missteps surrounding the Xbox One.
For those of you who don't know, Eric Lengyel is a pretty big player in the graphics industry. He's worked in 3D graphics for a while, wrote several books on it, and actually wrote and designed PS3's graphics API.
He currently works on the C4 Engine (he basically did this all solo), which is a professionally made indie rendering engine that is fast, fully featured and even has voxel terrain and Dynamic Horizon Mapping. Basically, he knows what he's talking about regarding graphics and is up there with people like Carmack.