CSTools are free plug-ins that are available for your Cinema 4D application. In this tutorial, Nick will show you how to use the plug-in called Flicker. Flicker is a fun add-on, although you may not use it often. It can be used to add a "flicker" to things like campfires, candles, lights, etc. So, if you need to enhance some light effects in your program, check this out.
