Pre- and Post-behavior

The John project will be used during this lesson.

There are many other buttons and functions available in the Timeline. After describing its main features in lesson 3, we will now dedicate this lesson (and the next) to explain its different options and their numerous pros.

Let's start with the Pre- and Post-behavior. Did you notice the small icons on either side of instances inside the layers?

A simple left click on the icons offers you access to the four options regarding pre- and post-behavior of the layers.

Let's take the case of post-behavior. You may choose between the options:

Hold. This option is active by default, and lets you hold the visualisation of the last image of the layer. It is the best option for backgrounds of when you want the last image of a layer to be exposed until the end of the clip without needing to stretch the exposition.

None. This option is the exact opposite of the previous one. It will let you expose only one image on an unique frame for example.

None also lets you create new instances : when chosen, you just need to be on another empty frame and draw for a new instance to be created.

Be careful to activate the Auto Create Frame and Auto Break Instance options, otherwise this action will not be possible.

Loop. This option will let you expose only one loop, but to be played repeatively until the end of the clip.
Ex : an 1-2-3-4-5 animation with the Loop option activated will be repeated like this : 1-2-3-4-5-1-2-3-4-5-1-2-3-4-5-1-2-3-4-5-1-2-3-4-5, etc... until the end of the clip.

Ping-Pong. This option works like the one before, but the cycle will be repeated in a round trip kind of movement.
Ex : an 1-2-3-4-5 animation with the Ping-Pong option will be repeated like this : 1-2-3-4-5-4-3-2-1-2-3-4-5-4-3-2-1-2-3-4-5-4-3-2-1-2-3-4-5-4-3-2-1, etc.. until the end of the clip.

These options work in the same way for pre-behavior.