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Optix doesn't support some nodes like the 'Bevel' or the 'Ambient Occlusion' node It doesn't matter if they are connected to the material output or not, but if they are even present in the shader editor window, the scene will no longer render Try it out with a fresh sceneBeing able to change an objects edge to get a hard surface, or completely round and soft look, is an amazing The node is an easy way to get beveled edges at rendertime bevels for objects in the scene Still, if you are working with a viewport render, the bevel node does not show Check out this short tutorial by Chip Walters that shows how you can bake bevels so that they will show up correctly in the Blender 28 EEVEE renderer Bevel Node Tips Tricks Blender Daily Blender 2.8 bevel node not working