On 05/09/2011 06:03 AM, Stephen Newbold wrote:
I'm sure this is something simple but my brain is fried this morning.
If I have a process that is relatively expensive within '_validate()'
used to define the region passed to my engine(), and I have a number
of knobs that affect this process (ie, changing these knobs directly
changes the result of the process) and a number of knobs that are
irrelevant to the process, what the best way of making sure my process
is only run when the correct knobs are changed but left alone otherwise?
I'm assuming I will wrap my process in a conditional statement, but
not sure what's the best thing to check for?
You could maybe hash the values of the relevant subset of Knobs using
DD::Image::Hash, and then just compare the hash value from last time to
your new hash - and if it has changed then redo the calculation.
Hope that makes sense...
Cheers...
John
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