Re-render the same view and note the higher contrast range of the result. Make sure that the Materials and Colors buttons are checked as well. In Rhino pre-select the vault surface and ground surface, and then with the shift keydepressed, right-click on the name material-1 and using the popup menu apply the material to the two selected surfaces. Go to Customize > Preferences > Gamma and LUT, and make sure enable Gamma/LUT Correction is turned On, and that Gamma is set to the default of 2.2.Since this scene has only a few objects, activating Vray Ambient Occlusion has not dramatically increased the rendering time. Depending on the complexity of your scene, render time may increase a bit. Check to make the scene is using the correct light types for the chosen renderer - 3ds Max Standard and Photometric lights will not render properly in Arnold or 3rd-party renderers such as V-Ray (you must use Arnold-specific and V-Ray-specific lights in the scene.) Turning Vray Ambient Occlusion enhances the details in the corner and joints.Try turning off Decay and/or increasing the Near/Far Attenuation values to see if this improves the scene illumination. Check Decay and Near/Far Attenuation to make sure they are set appropriately for your scene scale. Select individual lights and check their Intensity/Multiplier settings to make sure they are set to the proper intensity/color.Go to the Tools menu and choose Light Lister, then increase the values on some or all lights in the scene and do test renders to see if the scene gets brighter.If using the Physical Camera, set the Physical Camera Exposure Control in the Rendering > Environment and Effects > Exposure Control menu.Use the Render Preview button to do a quick, low-resolution test of your scene to check the lighting. Go to Rendering > Exposure Control > Environment > Exposure Control and check to make sure that Exposure control settings are correct, or are turned Off/On as appropriate for the render engine being used.To render out the AO pass without the help of the plugin.
Solution: To address these issues, try the following: There are three main elements specific to VRay that are creating.