How to use checkbox expressions in After Effects

Written on 15 September 2013, 01:42pm under Quick Tips

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You will often find yourself toggling the visibility of layers in After Effects. This can get really cumbersome and hazardous to click all those little eye icons in deeply nested compositions. Having a controller layer on top of everything with some checkbox expressions can really help organizing everything out.

Select the layer you’d want to toggle and add this expression in its opacity property.

(comp("the-comp-name").layer("the-layer-name").effect("the-checkbox-effect")("Checkbox") == 1 ? value : 0)

This layer will then show when the checkbox is checked. To invert the effect, just invert the value and the 0.

Heads up!

Most layers, when hidden, will not add time to renders and RAM Previews although sometimes, mostly when the hidden layer has expressions, it will still be processed when rendering.

Using the After Effects command line render

Written on 11 September 2013, 03:35am under Techniques

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Adobe provides us some command line interface to start renders without having to start After Effects (here’s the documentation). This can be really useful when using multiple computers on remote desktops or just to give you the ability to alt+tab, start your render and keep on working. It offers a lot of options and possibilities. We won’t go over all of them, but we’ll instead focus on creating bash aliases to execute what we would probably mostly want. Don’t worry if you’ve never used the command line, we’ll go over all there is to know.

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