This clip demonstrates how to create a caustic lighting effect using Houdini's Mantra PBR rendering engine. The first part starts with a refresher on refraction. More generally, guide looks at setting up normals correctly, then at the glass shader in Houdini, faux caustics and shadows, and using an environment light in PBR to generate 'background' reflections. Whether you're new to Side Effects Software's popular 3D production program or a seasoned graphic artist just interested in better acquainting yourself with the application, you're sure to be well served by this free video tutorial. For more information, including detailed instructions, take a look.