Shijie Yan
Shijie Yan
failed for test case: lower_one_mask(32) == 0xFFFFFFFF
Based on the [current implementation](https://github.com/fangq/mcx/blob/f1bce67ca78b4cdcfa8e0140e1ec3a5ff14000cd/src/mcx_core.cu#L798-L854), a photon is moved '1' unit length forward before it lands inside a non-zero voxel and get traced back to the entry point of that...