What does it look like: rilem.nl/c3-rimlight
A rim light is placed behind a subject that exposes the outline or rim of the subject with light. This lighting highlights the contours of a subject and creates a dramatic and mysterious effect.
This effect can be very helpful to make objects stand out and add some texture to a game scene. In Photoshop or other similar software you can quickly fake such an effect by applying an 'inner-shadow' effect with a bright color to an image.
Following that logic, I created a GLSL effect for Construct 3 which does exactly that. By playing with the effect parameters and making the effect move, you can make a pretty convincing back light!
This addon is provided completely free. Feel free to use it in any of your projects.
If you feel like doing something in return, please consider supporting me on Patreon!