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Let's discuss the options that were changed from the default settings when making the bzpreset file we just used. Keep in mind that once non-white materials are applied the decay option will likely make this scene too dark and will need to be turned off. The inverse square option should be selected as well to keep this white scene from getting too bright. Decay limits the ability of light to bounce around in the scene and thus makes the result more realistic in this case. The decay option is used here because everything in the scene has a white material applied to it by default. Changing these focus values is one way to alter the brightness of the scene. The focus option gives our point light both a “hot spot” or brightest area and a “fall off” distance which controls the spread of the light. We won't be using “direct illumination” right away but it doesn't hurt to have the shadow option on in the meantime. Turning on shadows will cause any objects directly illuminated by our light to cast a shadow. Following the screen shots below, set your lights parameters to include Shadow, Focus and Decay. Then open the object properties dialog for the light by clicking the properties icon or typing the command “properties”. With the point light selected, position it just below the ceiling height somewhere in your scene. Brazil can use this regular Rhino point light but in addition will also enable it with a wide range of options specific to Brazil lights. Using the scene provided, add a point light to the model with the normal Rhino light tools. The first step in any interior rendering should be to add some light. You can also download this simple Rhino file to use with the presets provided. To make things simple, here are three “.bzpreset” option files for you to use as you become familiar with the settings described. This tutorial will cover several techniques for lighting an interior scene in Rhino and will hopefully demystify the process of choosing photon map and light parameters. Brazil r/s offers a wide variety of control for how light and shadow are calculated in any given rendering.