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This page provides information on Cameras and Camera Settings in V-Ray for Unreal.
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Overview
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In order to have full visual parity between viewport and render you have to disable some of the Unreal posprocess and lighting components. You can do so from in viewport Show > Post Processing and leave only Depth of Field, Postprocess Material and Vignetting. From Show > Lighting Component uncheck Ambient Occlusion.
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The exposure and color corrections do not work as a global PostProcess volume and are individual per camera. To see the changes you make to the VRayPhysicalCamera's settings in the viewport you have to look through the camera itself.
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Camera Settings
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The VRayPhysicalCamera is based on the Unreal Camera, therefore all features are present and accessible but only some are supported in the current version. When rendering with V-Ray the following parameters are supported:
Current Camera Settings
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VRay Physical Camera Settings
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Aperture F-number vs Shutter Speed vs ISO
Cheat Sheet
The main options that control the brightness of a V-Ray Physical camera are Aperture F-number, Shutter Speed and ISO. They affect each other and you need to balance them according to your scene. Keep in mind that these settings do not correspond to those of a real-life camera. They apply only to the V-Ray Physical camera.
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Examples
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