Select which grid caches to read when playing a dynamic simulation.
If the cache contains a Density grid, read the Density values from the cache.
If the cache contains a Velocity grid, read the Velocity values from the cache.
If the cache contains a Temperature grid, read the Temperature values from the cache.
If the cache contains a Fuel grid, read the Fuel values from the cache.
If the cache contains a Color grid, read the Color values from the cache.
If the cache contains texture coordinates, read them from the cache.
If the cache contains a falloff grid, read them from the cache.