Thank you! That make sense. Will integrate this into my code ( now looking at my camera class ) … This is quite important, as if there is any frame lag, physics and other objects go out of sync.
Karim Beyrouti t: +44 (0) 7977 997 629 e: ka...@kurst.co.uk w: http://kurst.co.uk skype: karimbeyrouti 109 Timber Yard, Drysdale Street, Hoxton, London, N1 6ND On 26 Oct 2012, at 17:07, Hans Wichman wrote: > Hi Karim, > > i put them both in there, the one you are referring to is simpler: > ofcourse this value can be kept out of the enterframe loop, i have a utility > class for it (although it is a bit overkill;)) > > private function enterFrame( event : Event ) : void { > sp.x += speed * spDir; > if ( 0 > sp.x|| ( sp.x + sp.width ) > stage.stageWidth ) spDir = > -spDir; > > var lSpeedPerSecond:Number = 300; > var lSpeedPerFrameConstant:Number = lSpeedPerSecond / > stage.frameRate; > > spc.x += lSpeedPerFrameConstant* spcDir; > > if ( 0 > spc.x|| ( spc.x + spc.width ) > stage.stageWidth ) spcDir > = -spcDir; > > t0 = getTimer(); > } > > Anyway, basically frameindependent value is simply > SPEED_PER_SECOND/FRAMES_PER_SECOND. > > regards > Hans > > > On 26-10-2012 16:58, Karim Beyrouti wrote: >>> are you trying to do frame rate independent animation based on a fixed >>> frame rate (eg you switch from 30 to 60 and everything should move at the >>> same pace but more fluid >> Yep - that is the one… all my game physics is independent of framerate (time >> based)… however, I am trying to get other non-physics based animated >> objects/code >> to work the same way (i.e. the camera), and I am finding it a little >> difficult. >> >> Will try your solution - although it looks like it's for the other option >> (variable framerate)…. >> >> Thank you for helping…. >> >> >> >> Karim Beyrouti >> >> t: +44 (0) 7977 997 629 >> e: ka...@kurst.co.uk >> w: http://kurst.co.uk >> skype: karimbeyrouti >> >> 109 Timber Yard, Drysdale Street, Hoxton, London, N1 6ND >> >> On 26 Oct 2012, at 15:21, Hans Wichman wrote: >> >>> Hi, >>> >>> are you trying to do frame rate independent animation based on a fixed >>> frame rate (eg you switch from 30 to 60 and everything should move at the >>> same pace but more fluid), or trying to make up a variable framerate due to >>> running code? >>> >>> Anyway since you are keeping y constant I compressed the code a bit, is >>> this what you are looking for? >>> >>> private function enterFrame( event : Event ) : void { >>> sp.x += speed * spDir; >>> if ( 0 > sp.x|| ( sp.x + sp.width ) > stage.stageWidth ) spDir = >>> -spDir; >>> >>> var lSpeedPerSecond:Number = 300; >>> var lSpeedPerFrameConstant:Number = lSpeedPerSecond / >>> stage.frameRate; >>> var lSpeedPerFrameVariable:Number = lSpeedPerSecond * >>> (getTimer()-t0)/1000; >>> >>> spc.x += lSpeedPerFrameConstant* spcDir; >>> //spc.x += lSpeedPerFrameVariable * spcDir; >>> >>> if ( 0 > spc.x|| ( spc.x + spc.width ) > stage.stageWidth ) >>> spcDir = -spcDir; >>> >>> t0 = getTimer(); >>> } >>> >>> hth >>> jc >>> >>> >>> On 26-10-2012 15:29, Karim Beyrouti wrote: >>>> Hello Flash coders, >>>> >>>> It's been a little quite here of late… So, hope it's good with with you >>>> all. … I have been trying to figure this out for a day or so, and >>>> wondering if you can help. I am trying to time correct my animation to be >>>> independent of framerate, which is a little easier when dealing with >>>> physics (scaling velocity / position) than non physics animation… In my >>>> app physics is time corrected, however I have some code that is not >>>> physics based an am trying to have that running independently of framerate >>>> (and not really succeding). >>>> >>>> In the following demo: >>>> http://kurst.co.uk/transfer/timecorrection/TimeCorrection.swf >>>> >>>> I have two rects ( green and red ). The green one is being time corrected, >>>> and I would expect it to follow the red one ( as there is no lag in >>>> framerate )… however as you can see - it's not >>>> really working. >>>> >>>> Using the following formula to correct it: >>>> >>>> var spcTargetPosition : Point = new Point() >>>> spcTargetPosition.x = ( spc.x + ( spc.x + 10 ) ) * speed * spcDir; >>>> spcTargetPosition.y = spc.y; >>>> >>>> dt = 0.001 * (getTimer() - t0); >>>> time += dt; >>>> t0 = getTimer(); >>>> >>>> spc.x = spc.x + ( dt * spcTargetPosition.x ); >>>> >>>> >>>> Here is the full code: >>>> http://kurst.co.uk/transfer/timecorrection/TimeCorrection.as >>>> I would love it if you can point out where I am going wrong... >>>> >>>> >>>> Best regards >>>> >>>> >>>> Karim Beyrouti >>>> >>>> t: +44 (0) 7977 997 629 >>>> e: ka...@kurst.co.uk >>>> w: http://kurst.co.uk >>>> skype: karimbeyrouti >>>> >>>> 109 Timber Yard, Drysdale Street, Hoxton, London, N1 6ND >>>> >>>> >>>> Karim Beyrouti >>>> >>>> t: +44 (0) 7977 997 629 >>>> e: ka...@kurst.co.uk >>>> w: http://kurst.co.uk >>>> skype: karimbeyrouti >>>> >>>> 109 Timber Yard, Drysdale Street, Hoxton, London, N1 6ND >>>> >>>> _______________________________________________ >>>> Flashcoders mailing list >>>> Flashcoders@chattyfig.figleaf.com >>>> http://chattyfig.figleaf.com/mailman/listinfo/flashcoders >>> _______________________________________________ >>> Flashcoders mailing list >>> Flashcoders@chattyfig.figleaf.com >>> http://chattyfig.figleaf.com/mailman/listinfo/flashcoders >> _______________________________________________ >> Flashcoders mailing list >> Flashcoders@chattyfig.figleaf.com >> http://chattyfig.figleaf.com/mailman/listinfo/flashcoders > > _______________________________________________ > Flashcoders mailing list > Flashcoders@chattyfig.figleaf.com > http://chattyfig.figleaf.com/mailman/listinfo/flashcoders _______________________________________________ Flashcoders mailing list Flashcoders@chattyfig.figleaf.com http://chattyfig.figleaf.com/mailman/listinfo/flashcoders
