caching static object for grain sim

[robinlawrie]

Hi all, new Indie user here, so be gentle! 

 

im trying to do a grain sim, and i have a complex animated collision object.   i decided to cache out the collision volume to speed up sim times, as it spend a large proportion of the time "calculating SDF" 

 

i followed instructions  i found online, and in the static object DOP i set the file mode to "write"  and specified the filename as "collision.$f04.simdata" 

 

i then set the grain radius very high for a fast result, and ran through the sim. 

 

it saved out a series of .simdata files (22 meg each approx.) 

 

i then set the file mode to "read"

 

so far so good. 

 

however, when i sim again, it -still- spends a similar amount of time "calculating SDF" and doesnt seem any faster.. 

 

what did i miss? 

 

 

many thanks for any advice, Robin.