Interactive - Toggles between interactive and production rendering. Features such as Light cache and on-demand mipmapping are not supported in interactive mode.
Lock Render Camera/View – When enabled, locks the render camera from Render from Camera/View .
Render from Camera/View – Specifies the view to render from when the V-Ray render button is clicked.
Lock Image Aspect – When enabled, locks the X value and scales the Y according to the viewport size.
Resolution – Sets the output resolution for rendering.
Export VRScene – Enables the export of a .vrscene file when the V-Ray render button is clicked. The .vrscene file is saved in <Unreal_install_path>\UE_4.XX\Engine\Plugins\VRayForUnreal\Content with the file name output.vrscene.
Compress – Compresses geometric information when Export VRScene is enabled, thus making the resulting .vrscene file is smaller.
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Render Settings
Time Limit (Minutes) – Specifies the maximum time (in minutes) for refining the image.
Noise Limit – A threshold that determines when to stop refining a pixel. Higher values allow more noise in the image, but the render is faster. Lower values help reduce the noise, but take more time to render. A value of 0.0 traces the entire image unconditionally.
Sample Limit – Specifies the maximum number of samples per pixel for refining the image. V-Ray performs adaptive sampling on the image, trying to put more samples into areas with more noise.
Global Illumination
GI Engine – Specifies the type of secondary engine. Note that Brute force is always used as a primary engine.
Brute Force
GI Depth – The number of bounces for indirect illumination.
Light Cache
Subdivs – Determines how many paths are traced from the camera. The actual number of paths is the square of the subdivs (the default 500 subdivs mean that 250,000 paths will be traced from the camera).
Sample Size – Controls the size of the individual light cache samples.
Retrace – Enables retracing of GI near corners. This helps prevent light leaks and flickering. The value specifies the extent to which GI near corners is retraced instead of being read from the light cache. A value of 0.0 disables retracing. A value of 2.0 is good for still images. Higher values will result in more rays traces at render time.
Render Elements
Denoiser – A render element that progressively applies a denoising operation to the image. The denoising operation detects areas where noise is present and smooths them out.
Environment – Specifies which VRaySettingsEnvironment blueprint will be used at render time for environment overrides.
