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Thread: Let's git gud: Exercise 07 - Overlap/Follow-through

  1. #1
    Senior Member Unbounded's Avatar
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    Let's git gud: Exercise 07 - Overlap/Follow-through

    New exercise added 5-2-2016: Overlap/waving motion

    New exercise TBA


    Heya everyone, Unbounded here. Since I figured this spot was lacking some activity, and because I find things way more fun when other people are joining as well, I decided to make a fun olí thread where we can really just take a step back, and focus on learning the basic animation stuff, the fundamentals, really well. Like, really really well. You know, stuff like the bouncy ball, walk/run cycles, etc etc etc.

    Oh, and Iím going to be tackling them in order. From the very bottom, (ball bouncing, no decay), so regardless of animation ability you should be able to jump in and participate. Heck, pretty much everyone should be able to benefit from this thread anyway.

    ďBut Unbounded!Ē You might say, ďIíve already been animating for X amount of years! Iím already above this!Ē

    Well, sure, I thought that myself. Iíve been playing with animation for roughly a year myself, but when I do a bouncy ball exercise I still get some weird results like this. Until you try it you canít figure out if you have mistakes in the first place!

    But for a better answer, no, no you arenít above the basics. Industry professionals arenít above the basics.

    https://www.youtube.com/watch/?v=l_q6eyswBD4

    Hereís an example of a pencil test from Milt Kahl for Bambi. Freakiní Bambi. Itís basically modeled as a bunch of bouncing balls. Itís important. Trust me. Learning and practicing this stuff will improve every animation you work on from here on in.

    Convinced yet? Good! Letís get started then. The first few exercises will be listed below:

    Absolute Beginner animation exercises (Taken from 11secondclub forums):

    1: Bouncing ball, no decay. (Loop)

    For this exercise weíre just going to be taking a single bouncing ball. It starts at the top, falls vertically, and is nondecaying. This means that there is no energy lost due to air friction, and there is no energy lost in the ground, and as a result the bouncing ball always ends at the same height that it started. Itís the perfect, ideal universe.

    Thereís no horizontal motion yet. That comes later!

    I'll be posting tips for each of the exercises as I find them. I know I'm looking up ways to improve on this stuff myself. I see no reason why I shouldn't share this.

    Spoiler for 11secondclubTips:


    Spoiler for Submitted exercises/critiques::


    2: Bouncing ball, decay
    This is similar to the first one in that weíre working with a bouncy ball, but the big thing here is that itís actually decaying, meaning that it is losing energy. The heights of the bounces will gradually decrease until it settles at the bottom. This one is actually pretty powerful, and by simply changing the timing of the bounces and the heights of the ball you can easily convey what type of ball it is. (Weíll get on this a bit more later.)

    Spoiler for 11secondclubTips:


    Spoiler for Submitted exercises/critiques::




    3: Different types of balls. (Different weights, composition, etc etc)
    So this is pretty interesting. With the previous two exercises we were getting a hang of both timing and spacing. We tried to make some random circular object convey the idea that it was a ball.

    It turns out though, that by varying the timing and spacing of the bouncy ball animation, we can make it seem like a completely different type of ball! That's exactly what we're going to be doing for this exercise. Tweak the timing and spacing to make a few different kinds of balls. Because I want to keep a bit of focus, I'll recommend a few types of balls to focus on:

    A bowling ball
    A golf ball
    A water balloon
    A regular inflated balloon
    A lump of clay

    Really, there's any number of objects you can try out, I just think those are some good ones to play with. Good luck!

    Spoiler for Generic advice:


    Spoiler for 11secondclubtips:


    Spoiler for Submitted exercises:


    4: Horizontal bouncing ball, no decay

    This one is pretty similar to the first exercise, except now we acknowledge the existence of a second spacial dimension!

    It's going to be a ball that is bouncing horizontally across the screen. There is no decay in height. To make it a little bit more interesting though, let's also put a bit of spin in there. Simple enough, right? It should be a bit of a break after that last exercise!

    Some things to keep in mind:

    -Arcs! Remember that most natural motion moves in arcs. This case is no different! The arcs should be obvious!
    -The ball isn't in contact with the ground for long enough to really change the rotation speed. Keep that in mind while you're doing this!
    -The ball also isn't in contact with the ground for long enough to really slow down. Also an important tidbit!

    Spoiler for 11secondclubtips:


    Spoiler for Submitted exercises:


    5: Horizontal bouncing ball, decay

    So we've finally made it here, eh? For this exercise you are to animate a ball bouncing across the screen, with each bounce going lower and lower until it eventually comes to a stop.

    Sounds simple? It is relatively simple! There's some stuff you should keep in mind while doing this though:

    -The velocity of its forward motion will decrease with each bounce.
    -It loses more velocity when rolling across the ground than it does while bouncing.

    Make sure we can actually tell the ball is rolling for this one. Don't have a ball that is a solid color and completely uniform. Give it something so we can figure out what's up!

    Spoiler for 11secondclub tips:


    Spoiler for Submitted exercises:


    6: Pendulum Swing

    Hoo boy, this one is a classic pendulum swing.

    The rules are simple:

    -Animate a pendulum swinging.
    -The pendulum must eventually come to a stop.

    Sounds simple enough, right? Have fun!

    Other stuff to read. (Resources, blogs, advice, etc etc etc.)

    Spoiler for The principles from University of Washington:


    Spoiler for Tips from Animator Island:


    Oh yeah, I forgot to mention, I intend for this thread to be completely open in regards to critiques. We all have a ton to learn here, and we wonít get anywhere if everyone just tells us our stuff is good. Youíre free to say pretty much anything regarding an animation, (even the nitpicky stuff), but just make sure you actually try to give some actual constructive criticism. Just saying ďThatís badĒ or ďThatís goodĒ isnít very helpful. Try to explain why itís bad or good, or try to offer feedback as to how an animation can be improved.

    If you're on the receiving end of a critique, try really hard not to take it personally. We understand, you work on something for a while but then someone says that it's not perfect. It can be discouraging, no? But this is for our own sake so we can become better animators in the future. We have to learn how to handle criticism at some point. Why not now?

    Hoo boy! Alright, that was a ton of text. Without further ado, letís get started!
    I plan to update the thread with a new exercise every, eh, three or four days. Make sure you take the time to get these things as good as possible!
    (Yes I know the formatting is bad. I'll be workin' on it.)
    Last edited by Unbounded; 05-02-2016 at 06:28 PM.

  2. #2
    Senior Member Unbounded's Avatar
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    For my submission for the day:

    https://www.youtube.com/watch?v=AMM9iGx98PA

    Bouncing ball w/ decay exercise.

    I feel much better about this one than the previous two, but I'm becoming more aware of some issues. At each of the impacts due to me adding more frames it's less jarring and you feel more like the ball has a bit of give to it. I may have added too many frames on the third bounce, however. It probably should have been cut to two there. Adding some REALLY subtle squash and stretch helps mitigate the whole "it becomes a ping-pong ball" feeling I had previously but it's still there somewhat. Figuring out the heights is probably the hardest part of this for me right now. They currently look a little odd, but I was unable to pinpoint why they looked odd or how to fix the issue.

    I reduced the squash/stretch significantly and it looks better for it imo. I could make it transition to the stretch in a bit more of an exponential manner. This would probably look better with the increasing velocity before the contact positions.

    That's all the stuff I noticed. If anyone has any comments and/or critique that would be much appreciated!

    Edit: Submission 2 for the day:

    https://www.youtube.com/watch?v=Y7X9...ature=youtu.be

    Bouncy ball, no decay. I still feel a little iffy when it comes to the squash at the bottom. Getting it just right so it feels like there's an impact and so it still looks okay isn't the easiest thing ever, but I'll keep bashing my head against it until I get it.
    Last edited by Unbounded; 04-11-2016 at 11:25 PM.

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    Senior Member Unbounded's Avatar
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    Quote Originally Posted by Tun3 View Post
    Sweet. Thanks for being the first to participate in this!

    Now, regarding your animation:
    -The first thing that sticks out to me is that it doesn't really look like it's under any gravitational influence. It looks like it's moving back and forth in a linear fashion. To figure this out, check the spacings of the frames. Generally when you drop a ball from rest, you begin with very little spacing for each consecutive frame, and this spacing increases exponentally as you get towards the bottom. It hits the ground and bounces up elastically, (so there should be only one or two frames of contact). As it goes back up the spacings between the frames decrease again until you hit the top, and then you repeat the process. It's best to do this exercise with a ball bouncing by itself to really *get* the idea.

    So basically at the top you should always be easing in/easing out.

    Also, the ball is completely rigid. It wouldn't move that fast vertically without having some level of stretch!

    Anyway, keep at it brah. Looking forward to seeing more from you. Keep doing that practice thing!

    Edit: Third bouncy ball with no decay. I think I'm satisfied with this exercise:

    https://www.youtube.com/watch?v=negi...ature=youtu.be

    As always, cnc appreciated. I plan to do one more bouncing ball with decay implemented then I'll put up the next exercise.

    EDIT: 4/13/2016

    Final attempt at the bouncing ball with decay. I experimented with this one a bit and I'm pretty OK with how the result turned out.

    https://www.youtube.com/watch?v=Zrw8...ature=youtu.be

    And since as I'm posting this it's the 14th I can finally start the next exercise, Bouncing balls of different weights!
    Last edited by Unbounded; 04-13-2016 at 11:10 PM.

  5. #5
    Senior Member Unbounded's Avatar
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    4/14-4/15, finished my first go at the "Bouncing balls of different weights" exercise.

    https://www.youtube.com/watch?v=3kaK...ature=youtu.be

    As always, tips and tricks are appreciated. In particular I had a lot of trouble with the water balloon and the air balloon.

  6. #6
    A Potatoe chantful's Avatar
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    Yo sorry if I'm a bit late on this : http://sta.sh/0hugnfei8rk
    Spoiler for Do not open:

  7. #7
    Senior Member Unbounded's Avatar
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    So I meant to get up my second attempt at the balls with different weights up yesterday, and today, but I've been out of town for the weekend. I'm still animating and all but I haven't had much time to just sit down and plow through the entire exercise.

    Quote Originally Posted by chantful View Post
    Yo sorry if I'm a bit late on this : http://sta.sh/0hugnfei8rk
    Sweet! Another participant! Glad you could join the party!

    So, the big thing here is the easing of the ball. You definitely seemed to understand that it starts out slowly, and that's great! What you didn't quite convey is that as it gets towards the bottom, it continues to get faster. (At least, at the heights we're dealing with and with this particular normal ol' bouncy ball.) To get this idea across you need to keep increasing the spacing between frames until it actually hits the bottom. For you after about midway it seems to fall at a constant rate. You'll want to avoid this for most motion because the force of gravity is always constantly accelerating an object downwards.

    Squash and stretch seems pretty solid for the most part. You may have stretched a little bit too much on the frame right before the contact position. Remember that for squash and stretch to be believable you also need to keep volume in mind.

    It's a definitely a solid start. Keep it up!

  8. #8
    א‎ hamnet's Avatar
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    Bouncy ball: no decay (loop)



    Bouncy ball: decay (no loop)

    Last edited by hamnet; 04-17-2016 at 10:20 AM.

  9. #9
    Senior Member Unbounded's Avatar
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    https://www.youtube.com/watch?v=YpWY...ature=youtu.be

    Second shot at balls of different weights. I actually want to revisit this one a few more times. (It's actually hard AF) For now though, I'll keep moving on and instead backtrack during one of the less intense exercises. As always, Cnc appreciated! Feel free to nitpick the crap out of that thing.

    Some of the more subtle stuff might be hard to see so I'll make sure to re-render it zoomed in a bit closer when I clean up the thread a bit tomorrow.

    Quote Originally Posted by hamnet View Post
    Bouncy ball: no decay (loop)



    Bouncy ball: decay (no loop)

    A challenger approaches! Thanks for participating.

    -Your spacing is actually really solid. Props for that. You've also managed to keep the volume of the ball extremely consistent, which is a feat in and of itself.

    -At least from how I'm seeing it, you're overdoing the squash a bit much on the contacts. Remember that squash and stretch tells you about the physical properties of the object you're working with. Its composition, density, etc. With how much squash and stretch you have on both of those animations, it feels less like a bouncy ball, and more like a water balloon. It seems like something that is sloshing around. This isn't inherently bad at all if you're going for a much more cartoony feel, definitely, but that isn't quite what we're trying to accomplish here.

    -My eyes might be playing tricks on me since it's a little late and all, but it feels like on the decay it's losing a bit too much height on the second bounce. I'll make sure to get back at it with fresh eyes though.

    Anyway, good job! You have a pretty decent grasp of some of this stuff already, so it's great that you're willing to take a step back and fine-tune your abilities. Keep at it!

    And as of me posting this, it is officially the 18th of April. As promised I have to get the next activity up, so here it is:

    Bouncing a ball forward, with no decay in height or speed

    The thread will be updated for this new exercise.

  10. #10
    א‎ hamnet's Avatar
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    Quote Originally Posted by Unbounded View Post
    https://www.youtube.com/watch?v=YpWY...ature=youtu.be

    Second shot at balls of different weights. I actually want to revisit this one a few more times. (It's actually hard AF) For now though, I'll keep moving on and instead backtrack during one of the less intense exercises. As always, Cnc appreciated! Feel free to nitpick the crap out of that thing.

    Some of the more subtle stuff might be hard to see so I'll make sure to re-render it zoomed in a bit closer when I clean up the thread a bit tomorrow.



    A challenger approaches! Thanks for participating.

    -Your spacing is actually really solid. Props for that. You've also managed to keep the volume of the ball extremely consistent, which is a feat in and of itself.

    -At least from how I'm seeing it, you're overdoing the squash a bit much on the contacts. Remember that squash and stretch tells you about the physical properties of the object you're working with. Its composition, density, etc. With how much squash and stretch you have on both of those animations, it feels less like a bouncy ball, and more like a water balloon. It seems like something that is sloshing around. This isn't inherently bad at all if you're going for a much more cartoony feel, definitely, but that isn't quite what we're trying to accomplish here.

    -My eyes might be playing tricks on me since it's a little late and all, but it feels like on the decay it's losing a bit too much height on the second bounce. I'll make sure to get back at it with fresh eyes though.

    Anyway, good job! You have a pretty decent grasp of some of this stuff already, so it's great that you're willing to take a step back and fine-tune your abilities. Keep at it!

    And as of me posting this, it is officially the 18th of April. As promised I have to get the next activity up, so here it is:

    Bouncing a ball forward, with no decay in height or speed

    The thread will be updated for this new exercise.
    Thanks for the feed back, never really played around with the basics like this but I knew about spacing so I wanted to try it out, as for the squash I was just experimenting with it never actually done that either. Great thread keep those challenges coming!

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