Check out my latest collaboration with Tetsuya Takahashi on efficiently solving box-constrained QPs, especially for fluid animation problems on Cartesian grids, using an interior point method and a tailored algebraic multigrid preconditioner: https://tetsuya-takahashi.github.io/PD_BCQP/
And here's the YouTube link: https://www.youtube.com/watch?v=GeeweiNzcOQ
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