V-Ray Vision

V-Ray Vision is a real-time viewer that can be used in any project set up for V-Ray rendering. It is a lightweight “game engine” (rasterizer) that does not currently use any type of ray-tracing. Due to its speed, it can serve as a powerful alternative viewport that provides better lighting and material representation.
In addition to its main function as a viewer, V-Ray Vision can produce spherical panoramas and quick output of still frames. It comes with its very own auto-exposure, tone mapping, and color correction options.

When V-Ray Vision is launched, it automatically loads the current Revit project and starts an interactive session. This means that while it is running, a live link is established that sends to the viewer all updates made to the Revit scene.
Stopping the live link by clicking the Revit ribbon's V-Ray Vision button ends the connection but does not clear the loaded scene. To stop V-Ray Vision, close its window.

In addition to loading scenes directly from Revit, V-Ray Vision is able to load .vrscene files directly. In this case, in order for the modifications to be displayed, the source file has to be reloaded.

UI Path: ||V-Ray Toolbar|| > V-Ray Vision button

Enable Proxy LOD – Enables the LOD switching for Proxy Mesh assets. The full mesh is visible up close, whereas the proxy preview mesh is displayed in distance. Note that both share materials.

Optimize Shadows – Uses lower-quality direct light shadowmaps during interactions.

Auto Exposure – Enables auto exposure. Use the EV Compensation slider to change the target exposure value.

EV Compensation – Multiplies the exposure value of the camera or the value calculated by the Auto Exposure (when active). This option can store two independent values based on whether Auto Exposure is active.

Fly Mode – Changes the view navigation mode. Use the W, A, S, D, Q, E keys on the keyboard to move around. Holding down Shift will temporarily increase the movement speed. Hold the Left Mouse Button to look around

Fly Speed (m/s) – The movement speed measured in meters per second. Only has an effect in Fly mode.

Mouse Sensitivity – Changes the mouse speed when looking around in Fly Mode.

Smooth Movement Delay – The time it takes the camera to gradually cease after being moved during Fly Mode. Calculated in seconds.

Automatic IBL Sun – Automatically adds a directional light based on the brightest spot in an HDR image. The option has no effect if the project Sun is enabled. It is not recommended to enable it if there is no single distinct bright spot in the image used for lighting.

Tonemapping Curve – Specifies the type of tonemapping applied to the image. When disabled, no tonemapping curve is applied.

Disabled
ACES Curve

Exposure – Controls the post-exposure value.

Contrast – Controls the post-contrast amount ranging from -100 to 100.

Saturation – Controls the post-contrast amount ranging from -100 to 100.

Temperature – Controls the post color temperature value ranging from -100 to 100.

Tint – Controls the post color tint value ranging from -100 to 100.

Reset – Resets all color corrections values to 0 (the default value).

Load – Loads color corrections preset file.

Save – Saves the color corrections as a .visioncc file that can be loaded later.

File – Specifies the output image file path.

Image Format – Specifies the output image file type between .png, .jpg, .tga or .exr.

Save as Spherical Camera (experimental) – Saves the output image file as a spherical panorama. Note that the view direction is ignored. The panorama camera always uses a default orientation. Screen space reflections are disabled in this mode to avoid artifacts.

Resolution Mode

From Vision Window – The window size determines the output image size.
From Project – The image size specified in the host application or the V-Ray scene determines the output image size.

Output Resolution – The final output image resolution. Note that the size multiplier value is also taken into account.

Size Multiplier – Multiplier for the base resolution. Note that there is a hard limit of 8192 pixels for the long edge of the image to avoid video memory issues.

Super Sampling – Reduces aliasing. Larger values are slower to render and require more video memory available. Note that there is a hard limit of 8192 pixels for the long edge of the image to avoid video memory issues. No supersampling is performed if the long edge of the image is already set to 8192 pixels.

Animation FPS – This feature is not supported yet in V-Ray for Revit.

Export – Exports a still image.