Saturday, 26 November 2016

Animation Principles 006

(Note: I may refer to Slow in/out as Ease in/out as it is terminology I used use for flash animation.)

Bouncing Balls
In this exercise I experimented with how timing and spacing affects our perception of different materials, how fast they move and how much energy they retain on contact.

Starting with the Ping Pong Ball.
Upon contact, this ball retains a lot of energy. Due it to it being hollow, light and fairly hard. Presumably the ball coils up slightly (squashes) and due to its material, pops back into shape pretty quick. This gives the ball enough force to leave the ground with very little wasted energy.

I'm not entirely happy with the spacing of this animation. After completing this I did some further research. I mainly used this video ( ) until I came to a mental conclusion as to how I wanted to approach the animation. I concluded that the material of the object is defined by the percentage at which the object exfoliates energy on contact with the ground, relative to the size of the object. To apply this effect I used the frame immediately before contact as a reference, the frame after contact will always be less than this value unless more energy is injected into the object. The amount of energy that leaves the object will be roughly the same each bounce, i.e. 50%  in the case of a ping-pong ball, very little, perhaps 5-10%. Of course, this also requires good arcs to apply.

Tennis Ball

This one was quite fun. I had the opportunity to apply what I had learned in my research. As you can see, I made sure the force of the ball leaving the bounce was less than that of the impact. This gave me more frames as it slowed into the peak of the bounce while accelerating out of the bounce at a similar rate each time as the force of gravity will be constant.

I added squash and stretch at the most extreme points. just before and after contact and during the contact pose. Though the ball would easy back into its original shape, I thought this is perhaps too minor to concern myself with. Though in hindsight i'd only have to orient the extreme squash and default poses together using the light box to find an in-between.

Bowling Ball

For the bowling ball I knew I would have to use few frames and have each bounce much less than the previous. Keeping in mind the ball will travel from left to right at a consistent slow in pace, I tried to keep my spacing the same. Perhaps not the best left to right consistency, but I feel pretty confident in the arcs.

Another aspect of doing the bowling ball to keep in mind, is the size of the ball. using this same arc for a smaller ball would appear lighter, though still heavy. Thus I scaled the bowling ball up. This means the movements are much more subtle and the ball needs to more follow the arc of action smoothly to avoid any anomalies in the movement.

Furthermore, once I had finished the initial animation of 14 frames. the ball came to a very sudden stop. This where I went back in and added another 4 frames, rolling and slowing into a stop. For a total of 18.

For further experimentation I did the same exercises digitally using Animate CC.
30. 27 & 15 frames respectively.

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