Q: instances in scene

[TzMtN]

Here is a quick test for you:


(
local selArr = for o in selection collect o

for i in selArr do (
local objRefNodes = for r in (refs.dependents i.baseObject) where isValidNode r and r != i collect r
if objRefNodes.count > 0 then (
for o in objRefNodes do (
local n = findItem selArr o
if n > 0 then deleteItem selArr n
)
)
)

select selArr
)


I used the 'refs.dependents' function to find instances of the base object
and removed them from the selection.

[Leionaaad]

thanks man, works just fine, pitty I can understand only half of it..

[thatoneguy]

Just a quick performance question.

You use if > 0 and I use != 0. Is one or the other faster or less memory intensive?

I imagine it's marginal one way or the other. Just curious.

[JHaywood]

Just a quick performance question.

You use if > 0 and I use != 0. Is one or the other faster or less memory intensive?

I imagine it's marginal one way or the other. Just curious.


I was just wondering that myself yesterday.

[ZeBoxx2]

it is marginal - memory-wise it didn't make any difference, speed-wise... for 10,000,000 iterations of random numbers between 0 and 100 (only positives), seeded the same for both runs:
> -- 23744ms
!= -- 23234ms

As for which to use... I seem to use them mixed based on the function.. findItem, (getFiles <filespec>).count and that sort of thing, looks like I use "!= 0"... whereas other things, like <array>.count, I use "> 0". In general it seems I use "> 0" when the value of N later matters in the code - which, for findItem and getFiles, tend not to be the case; getFiles I use mostly to check if a particular file exists or not (doesFileExist isn't supported in all max versions we support). Perhaps there's a more sane systematic approach, but as long as the code does what it's supposed to.. given the negligible speed difference..

[thatoneguy]

Same here.

If I'm checking to see if it found something (finditem) I use !=. If I'm counting array items I use > 0.

Which doesn't really make any semantic difference... I guess it's just bizzaro subconscious motivations.

I guess I view a search with no results as a failure and a count of 0 as a possible and normal scenario?

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