That's one reason for the checkpoint feature, yes, but there are others. A few years back (Dory-era), I participated in a talk at SIGGRAPH '15 about some of th

That's one reason for the checkpoint feature, yes, but there are others. A few years back (Dory-era), I participated in a talk at SIGGRAPH '15 about some of them: https://dl.acm.org/doi/abs/10.1145/2775280.2792573 https://dl.acm.org/doi/abs/10.1145/2775280.2792573 http://eastfarthing.com/publications/checkpoint.pdf http://eastfarthing.com/publications/checkpoint.pdf