The February 2012 Tutorial Discussion

[wizard509]

Back to handrawn's example. I think he is talking about animations showing the effect of gravity. The ball goes up and gets progressively slower until it reaches apogee at which time it gains speed again on the way down. I'm not saying it's not possible with Xara but I am saying it would be difficult and requiring many extra steps to simulate the gravity effect. I'll have to try that and see, cause I might be wrong.

[Gare]

As long as you have both Handrawn's picture and the tutorial as a reference, I don't see why anyone can't—with a little trial and error—come up with a faithful animated representation of a bouncing ball with Earth gravity.

That wasn't the point of the tutorial—I wanted to get people interested in a verifiably underused Xara feature, and cartoonish exaggeration—which has been used in animation studios for 70 years (squash and stretch cartoon physics)—felt like a good entry point for me to use.

When I suggested viewers perform variations on what I showed—a bouncing chair or something bouncing while changing colors—well, an accurate representation of a ball bouncing and losing energy ultimately, is a good variation, too!

My Best,
—Gary

[wizard509]

Yes I understand that wasn't the point, I just thought it interesting and something to consider.

[handrawn]

Back to handrawn's example. I think he is talking about animations showing the effect of gravity

Hi Larry

yes

the apogee [point furthest away from centre in orbital path] is an example of an 'inertia point', that is an instant in the motion of an object when it is actually very fleetingly at rest [ie not moving]

traditionally animators 'slow out' when motion picks up and 'slow in' when motion slows down - what those terms mean is that you 'bunch up' your drawings and thereby slow down the uniformity of motion, but you do it in such a way as to make the increase in speed visible in the 'slow out' and the decrease in speed visible in the 'slow in'

the attached shows a pendulum with the [slow out slow in] chart that represents the frames, and you can see the bunching [its a simplified set of course] - doesn't take a lot of imagination to turn that pendulum chart into a ball bouncing from floor to ceiling [hopefully]

in cell animation all these frames would be drawn [both the keys and the 'inbetweens']

that covers the timing - I guess you can use tweening in xara to change the shape by generating the inbetweens, rather than having to draw all of them yourself

[note 'slowing out' is often called 'easing out' and 'slowing in' 'easing in']

[Gare]

A very nice aside, Handrawn; this is great stuff for anyone who wants to get beyond the act of animating and immerse themselves in the art of animation.

And I think there's a certain point (of ambition) where Xara's native animation tools cannot carry you to, for example, a 10 minute animation. It's not the right tool, however, Xara can make quick work of animated titles. Boris wants $$$ for an After Effects plug-in that essentially does what you can do by hand with titling in Xara and export with an alpha.

__________________________________________________ _

Ease in and Ease out are natural phenomena, they exist both in the cartoon realm and in the real world. The beginning of an action has built-in acceleration, while when a body loses energy or transfers it, there is a natural ease out of the motion, a de-acceleration. The best example I can think of is a baseball player as they swing the bat and connect with the ball. Of interest in this analogy is that the baseball bat will slow for two reasons: the transfer of energy to the ball, and the baseball player's inclination to slow down after a sufficient amount of swing has been completed.

In traditional animation, and digital when the folks know what they're doing, this Ease In and Ease out motion non-linear phenomenon is exaggerated, and that's perhaps what makes Porkie Pig, and Buzz Lightyear, et al, seem fantastic and real at the same time. The way in which they move is hyper-real, natural physics are bent, and occasionally broken, but respect is always paid to what goes on in the Real World.

-g-

[wizard509]

Thanks you guys. Very interesting information.

[stygg2003]

Well Larry, Wizard and Gary (seems familar that, can't quite put my finger on it) You've lost me with all the jargon so I'll stick to bounce, squash and stretch for now until I get the hang of animation. It's good fun learning though Had to slow the speed down a bit of the original to get the extra animation to do what I wanted, I'm no expert but it looks not to bad for a bit of fun.

Stygg

[Gare]

That would be, "Curly, Larry, and What's His Name"?



You clearly did learn something, stygg...that's a fun little piece and I'm thrilled that you did a variation on the original.

The only suggestion I'd offer is that the little ball that does the clockwise thing behind #1 and #2 in the foreground needs to arc up and over, instead of making a linear transition. I'm not sure how easily this could be done without the XAR file, and certainly not worth it if it doesn't bother you, its creator. I hate it when others step on my personal expression, so I try to be mindful of this with others.

Here's a larger-than-necessary animated GIF I did a long time ago, drawing in with Xara, to work the squash and stretch as a cycle across the screen:

>>>Ball bounces across stage<<<

There were just too many creative possibilities with Xara's animation engine to ignore it as a tutorial. It would be easy to create two or three more in the distant future, if there's an interest.

My Best,

Gary

[stygg2003]

Thanks for your comments Gary and that Gif is great. I myself would like future tuts. on animations if just to be a bit more knowledgeable on the subject, I know I can read it up but nothing beats being shown as in your vid. tuts. As regards stepping on my personal expression, well I have no problem what so ever with that so I've uploaded the file and if you get time, I would be grateful to be shown the movement you mentioned, after all if you don't ask you won't progress

Best regards
Stygg

[Gare]

I've attached your file with a minor tweak here and there, stygg.

I need to add a frame, and still not mess up the overall animation: frame 2 is a duplicate of frame 1, where I eased the 3 balls in front down a little and then used frames 1 2 and 3 to "arc" the tiny ball instead of dashing mid-air to the right between 2 and 3.

I also reduced the first duration to .1 seconds to smooth out the transition between the last frame, frame 1 and then 2.

I think your idea is very funny without a verbal explanation. It's just old-style entertainment, where no intellectual play on words needs to be made or anything, your variation is just funny and entertaining.

How's about we return to animation late summer 2012?



My Best,

Gary