Generally, the Quality presets will work for a wide variety of scenes and you do not need to adjust the settings any further. Changing the Quality preset from the Render rollout sets a number of options with appropriate values for the selected preset. The exposed controls vary depending on the combination of selections between CPU/GPU, Interactive/ Production, and Progressive/Bucket options. Note that the displayed options in the Advanced settings rollouts change in accordance with the settings from the Default panel. The default options usually work for different scenes, but if access to more advanced options is needed, the right-hand side panel of the Asset Editor provides those. V-Ray Settings are organized in two panels - the main one exposes the default options for a scene setup. They can be accessed from the Asset Editor in the Settings tab. Shadow offset is how faraway the shadow is from the shadow casting object. V-Ray Settings provide control over the parameters that adjust the rendering process. The default rendering setting for shadow offset in Rhino is set to. This page introduces the render settings in V-Ray for Rhino.