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VFX Compositing CG Element Behind Real Glass


Jacob J Holiday writes:

In this Blender tutorial we'll look at how we can composite a CG object behind some real glass in our live-action footage. We'll also dive into fundamental render & compositing principles that will hopefully prepare you to tackle other challenging VFX shots!

A key to understanding how to add CG to live-action footage is learning how to break up a render to extract key elements like the shadows, reflections, and refractions. As such, this video will introduce you to the three ways to control scene breakup in Blender Cycles: object visibility, collection visibility, and view layer visibility (render passes). I've created this free infographic which should help you understand how these three domains of control interact with each other:

Please leave any questions or comments on this article or in the video. Happy Blending!

About the Author

I'm a commercial director using Blender 3D to ad CGI to the real world. See more of my work at and at


  1. That "awesome keyboard model" is just the undisputed most awesome first personal computer in the history of the world. The Commodore C64, my first ever computer that pushed me off on a nerdy path of no return. It is by no means just a keyboard! Ah these young people and their ipads... :D Nice tutorial though, i'll no doubt learn a bunch of new stuff again ! Thanks.

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