When creating a geometry cache, your object’s deformations are evaluated or sampled every frame and are saved to your geometry cache every evaluation by default. You can change how your object’s deformations are sampled and saved by changing the following cache options: Evaluate every frame(s) and Save every evaluation(s).
Evaluate every frame(s) lets you specify how often samples are taken during geometry cache creation. For example, if Evaluate every frame(s) is set to 2, then your object’s deformations are sampled every other frame. Save every evaluation(s) lets you specify which samples are saved during geometry cache creation. For example, if Save every evaluation(s) is set to 2, then only every other sample of your object’s deformations are saved to your geometry cache on disk.
Evaluate every frame(s) and Save every evaluation(s) are also useful when you want to sub-sample or oversample your object’s cached deformations. For example, if you plan to scale the length of your object’s geometry cache to create a slow motion effect, you would set Evaluate every frame(s) to 0.1 and Save every evaluation(s) to 1 to save extra cache data to your geometry cache. That way, when you scale your object’s cache by 10, its deformations would appear to be in slow motion. Otherwise, had you not saved the extra cache data, your object’s cached deformations would be linearly interpolated between cached frames.
The Evaluate every frame(s) and Save every evaluation(s) geometry cache options are located in the Create New Cache, Replace Cache, Merge Caches, Append Cache, and Replace Cache Frame option windows.