Controlling DAE animations in Papervision3d
-Works with papervision rev 910 and below (idk how much below xD)-
I just uploaded a new version of DAEMC to the trunk. This time i had to modify more files to be able to implement a feature that i think is very nice to have. And that is: controlling the animation speed smoothly. This is usefull to make matrix like effects or just for smoothing animations.
DEMO (421Kb no loader)
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How it works now?
Imagine the DAE timeline as a simple flash timeline, like this:
with DAEMC v.1 you could change the FPS of the animation and what that did was jumping frames skipping some of them resulting in a jumping animation. Now with DAEMC2 the timeline is like this one:
and it behaves similar to a motion tween timeline in flash CS4, where you can stretch the animation making it smoother, like this:
now new frames are created between the original keyframes by interpolating them (simple linear interpolation) getting a nice and smooth animation. This is made by editing a new poperty called Xframes (read-write), for example, in the image above the Xframe whould be 3, because you had 3 frames in between each frame, so as in a motion tween timeline, you can stretch the frames all you want, but not compressing them. In the DAEMC v.1 you could change the FPS to a lower rate but i decided not to implement that because i thought that doing that was always going to result in a jumpy animation… but you can still do it if you want by using a Tween engine in the curentFrameNumber property (in theory, not tested…).
This is the biggest change in the DAEMC class, but i had to edit some core files in papervision3d to get this done:
- org.papervision3d.core.animation.channel.AbstractChannel3D: added a new method updateSmoothlyToTime()
- org.papervision3d.core.animation.channel.MatrixChannel3D: override the AbstrachtChannel3D updateSmoothlyToTime
- org.papervision3d.objects.DisplayObject3D: this is the key element, added gotoTransform(), this method make the interpolation.
- a brand new org.papervision3d.objects.special .DAEMC2
From DAEMC to DAEMC2:
- added> get/set Xframes():uint > add new frames between original frames. 0 is the original frames of the animation.
- deleted> get/set fps(newFPS:uint):void //now this is controlled by Xframes
- unchanged> get totalFrames():uint
- unchanged> get currentFrame():uint
- added> currentFrameNumber(frame:Number):void > curentFrameNumber is the curent frame + de decimal value is the distance between that frame and the next one… example: 1.5 will be frame 1 in the middle between frame 1 and 2.
- unchanged> get isPlaying():Boolean
- deleted> setFrameLabel(frame:uint, name:String = null):void
- deleted> gotoAndPlay(frame:Object):void
- deleted> gotoAndStop(frame:Object):void
- unchanged> addFrameScript(frame:uint, callback:Function = null):void
- added> get/set inReverse():Boolean > Set this to true if you want the animation to play backwards
- How do i do a gotoAndPlay o gotoAndStop now? –you can do that by setting the fame you want .curentFrameNumber = X and then calling a .stop() or play()
- Why you deleted addFrameLabel? -I make myself the same question… i’ll probably add it… depends on the feedback.
- How to i change the speed of an animation at runtime? -you can set or call the Xframe property of the DAEMC2 instance.
- Why addFrameScript take an uint but curentFrameNumber is a Number? -you can only set actions on the oiginal frames of the animation. I could add the posibility later… dpending on the feedback is people will use it.
- What if i want to make an animation faster? -well, i made the currentFrame get/set so you can make experiment with tween engnes… you could tween that property to mkae it go faster…
- How would I get a model to play in reverse? doing model_instance.inReverse = true; take in count that any frame script will be called…