Does anyone have any experience with a maths library that supports vectors, matrices and quaternions and has pretty decent optimizations for NEON and SSE? I typically roll me own as required, but I currently feel like I'd like an off the shelf solution which is fast, reliable and free. Eigen is often the most mentioned one, and the software license these days is a bit nicer, I am a little put off by the size of it (although not enough not to give it a try), I understand it supports NEON/SSE, although just how optimized it is, it isn't clear to me. I'm doing some experiments with CPU skinning at the moment, so have a reasonable test case for an improved library! Anyone got any first hand knowledge/experience?