# RigtSource

A RigtSource can be every After Effects layer with a bounding box: videos, still frames, shape layers, solids, nulls, texts, adjustment layers (no cameras, lights or sound layer). It is rigged with expressions to scale between to layers. 

If you need to keep the proportions of the content of a RigtSource, you need to create a [RigtFill](/rigtrect/functions/rigtfill.md) instead.

![](/files/-M0cJgvPwk5QirGKL996)

### Anchor & Handle Layer

The anchor layer determines the point from where the RigtSource layer is scaled and the handle layer defines the point where the RigtSource spans to.

{% hint style="info" %}
To keep the number of control layers as low as possible you can define the layer itself as its anchor layer. You then only need a handle layer for a working rig. The effect resets the anchor layer to itself.
{% endhint %}

### Anchor Position

Select the corresponding position of the anchor point with this drop down. If the RigtSource is flipped vertical or horizontal adjust the anchor position.


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