addLight()

Creates a new light layer and adds the LightLayer object to this collection.The new layer honors the Create Layers at Composition Start Time preference.name

timeSpanStart

The time in the composition, in seconds, at which rendering will begin. Setting this value is the same as setting a custom start time in the Render Settings

time

The current time of the item when it is being previewed directly from the Project panel. This value is a number ofseconds. Use the global method timeToCurre

addKey()

Adds a new keyframe or marker to the named property at the specified time and returns the index of the new keyframe.time The time, in seconds, at which to a