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The global Contours rollout gives you more control over linework, making it easier than ever to give your renders an illustrative look. Enabling Enabling the rollout, applies contours (Toon Override) to the entire scene and you can play with a number of intuitive controls to alter their appearance. The biggest benefit of this option is that it easily adds contours to all scene objects.
See the Line Rendering page or the Courseware page for more information.
UI path: ||V-Ray Asset Editor|| > Settings > Contours
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