Exploring whether O3DE can replace Unity as the render engine for a drone simulation that streams multiple 1080p camera feeds via GStreamer. From first scaffold to three live RenderToTexture pipelines in a single session.
Working through six C++ problems modeled on Optiver’s Senior SWE assessment: supermarket checkout simulation, order book matching, dividend pricing, lattice path DP, Dijkstra with K free edges, and a price-alert router built twice — AoS first, then SoA. Every bug, wrong turn, and data structure tradeoff included.
A detailed technical walkthrough of profiling and optimizing a headless Unity simulation from 21 to 25 FPS — covering NVENC GPU encoding, batch camera rendering, GPU instancing, static batching, and the failed URP migration. Every measurement, every dead end, every lesson.
How a simple erase-remove in every add_timer() call turned entity registration into a quadratic bottleneck — and the 71x speedup from moving cleanup to the right place.
Eigen’s blocked Householder path only existed for left-side application. I added the right-side equivalent, upgrading M*Q from O(n) rank-1 updates to cache-friendly blocked matrix multiplies.
A performance optimization in Eigen’s fill path assumed all scalar types are equal. GCC’s libstdc++ disagreed — and AutoDiffScalar paid the price.