Rectangular Lights Rectangular lights have a physical geometric form that produces soft shadows and reflections. Its many parameters provide you with several options to create your desired lighting effect. This video tutorial covers some of these parameters, including Intensity, Options (Double-Sided, Invisible, No Decay, and Store with Irradiance Map), Sampling and Shadows. The video was recorded using V-Ray for SketchUp but also applies to V-Ray for Rhino.