Playback and Options

To play the animation, you can either press the buttons at the bottom of the Viewer, or use the keyboard shortcuts.

Viewer Buttons and Time Controller

At the bottom of the Viewer there is a selector for connecting a Timeline, as described in the Mutiple Timelines and Viewers section on the previous page.

Next to it, there is a time controller consisting of a timecode and its frame equivalent:

To the left of the Time Controller there is a stopwatch icon that displays a Mini-Timeline at the bottom of the Viewer. Its zoom ratio and positioning are the same as that of the Timeline connected to the Viewer. The keyboard shortcuts for navigating these Mini-Timelines are the same.

This is especially useful when working in full-screen mode with a maximized Viewer.

Then there are six buttons for various controls:

Three shortcuts recall editing software workflows:

Note: Unlike editing software, playback will always be at 1x, even if the j or l keys are pressed several times consecutively.

Playback Options

In the Timeline header on the right there is a button that shows a gear in a stopwatch.

This button shows:

The video below shows how the Play Visible Range option allows you to play only the visible part of the Timeline.

Warning:

Bear in mind that when the Play Visible Range option is active, Work Areas are completely ignored.

Selection Options

Then there are two options for selecting:

By default, these two types of keyframes can be selected by clicking directly on them, but not with a selection rectangle.

Meta Keyframes

If you set up the screen to only display the layer's Position parameter by pressing the p key, the Meta Keys will also be displayed on the Transform parameter. There may be more Meta Keys than Position keys, as they represent other keyframes created on other parameters, such as Rotation and Scale.

Creating a large selection rectangle to select Position keys before deleting them would select Meta Keys from other parameters and could also delete other non-visible keys. This is why this option is OFF by default.

However, if your goal is to delete all Transform keys at once, enabling it allows you to select all the keys on a single line before deleting them.

Note: All Transform parameters can be displayed by selecting a layer and pressing the t key.

Visibility Keyframes

The same logic applies to Visibility Keys. Selecting them accidentally by drawing a selection rectangle around the Position parameter could cause several layers to disappear. That's why this option is OFF by default.

Here again, if your goal is to remove a large number of Visibility keys by working directly with block handles located in the dope sheet, this option can be very useful.

Note:

For the same reasons, pressing the u key to display all keyframes contained in a layer will ignore the visibility keys, whereas each new layer has two by default. To access them, press the v key, not to be confused with the o key, which displays layer Opacity.