RigtFill

Just like a RigtSource the RigtFill can be any After Effects layer with a bounding box. The RigtFill tries to fill out the area of its parent. Combined with a regular RigtRect as an alpha mask, the RigtFill is a perfect companion for responsive animations.

The RigtFill can also be parented to any other layer (besides camera and audio layers). It allways fills out the space of its parent layer.

The difference to a RigtSource is the option to constrain the proportions while beeing scaled.

Maximize

While this option is activated, the RigtFill layer covers the whole area of its parent layer. When deactivated the RigtFill stays within this area.

To cover the whole area of the parent layer while staying within the bounding box, you can deactivate the maximize option and add a motion tile effect to enlarge the fill.

You can still modify the size of the RigtFill layer even if the scale property has an expression applied.

Adapt Proportions

If you decide that you don't want to keep the proportions after you have succesfully set up and animated your RigtFill simply activate the "Adapt proportions" option and the RigtFill acts comparable like a RigtSource.

Anchor Point

Reposition the anchor point to left (X -100%), right (X +100%), top (Y -100%) or bottom (Y +100%) to scale the RigtFill from this point.