Script dropping performance as animation range gets longer

#1

I have a script that is supposed to run through every frame and output a selected camera’s animation data. The problem I’ve run into is that the performance of the script decreases as the total animation range increases. For example, if I have a 100 frame range it takes about 3 seconds to get through all 100 frames, but if I have a 3000 frame range it takes 20 seconds to get through those same 100 frames. I’ve already done everything I thought would help for optimization with no luck. What could be the underlying issue?

camExportDummy = Dummy name:"CameraExportDummy" pos:[0,0,0]
disablesceneredraw
undo off
for i = animationRange.start to animationRange.end do
(
   sliderTime = i
   cbTimestamp = at time i $MetadataDummy.modifiers[1].replayCurrentFrame as string
   format "%\t\t"cbTimestamp to:outFile
   camx = at time i $.transform.pos.x
   camy = at time i $.transform.pos.y*-1
   camz = at time i $.transform.pos.z
   format "%,%,%\t" camx camy camz to:outFile
   
   camExportDummy.rotation = at time i $.transform.rotation
   camExportDummy.transform *= (rotateXmatrix 90)
   camExportDummy.transform *= (rotateZmatrix -90)
   camQX = camExportDummy.rotation.x
   camQY = camExportDummy.rotation.y
   camQZ = camExportDummy.rotation.z
   camQW = camExportDummy.rotation.w
   format "%,%,%,%\t" -camQX camQY -camQZ camQW to:outFile

   camFOV = at time i $.fov
   format "%\t" camFOV to:outFile
   camFocus = at time i $.mpassEffect.focalDepth
   format "%" camFocus to:outFile
   
   if i < end - 1 do
   	format "\n" to:outFile
   
   i += 1
)
delete camExportDummy
close outFile
undo on
enableSceneRedraw
#2 
for i = animationRange.start to animationRange.end do at time i
(
   cbTimestamp = $MetadataDummy.modifiers[1].replayCurrentFrame as string
   format "%\t\t"cbTimestamp to:outFile
   pos = $.transform.pos * [1,-1,1]
   format "%,%,%\t" pos.x pos.y pos.z to:outFile
   
   rot_tm = $.transform.rotation as matrix3
   rotateX rot_tm 90
   rotateZ rot_tm -90
   camQ = rot_tm.rotation
   format "%,%,%,%\t" -camQ.x camQ.y -camQ.z camQ.w to:outFile

   camFOV = $.fov
   format "%\t" camFOV to:outFile
   camFocus = $.mpassEffect.focalDepth
   format "%" camFocus to:outFile
   
   if i < end - 1 do
   	format "\n" to:outFile
   
   --i += 1
)
close outFile

i don’t have max around to test, but get the idea.

you don’t need to move slider, and you should use ‘at time’ context only once

#3

Thanks, that fixed it! Now it’s doing all 3000 frames in under a second. However, I had to keep my original rotateXmatrix section of the code since the rot_tm section in the example was returning different values