Final Result with image size 784x784, and 1024 ray casting out per pixel takes roughly 20 minutes to render under multi-thread acceleration, BVH tree optimization and -O3 flag on CPU Intel(R) Core(TM) i7-8565U CPU (4 Cores 8 Threads) @ 1.80GHz.
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Online Course GAMES101 Assignment7: Path Tracing Algorithm Implemented with Multi-thread Acceleration
C++