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This drop-down gives access to render elements rendered for the scene. The selected render element is displayed in the VFB. By default, the RGB color and Alpha render elements are available. Any additional render elements that have been added to the scene will also appear in the drop-down.

This part of the toolbar sets the currently selected channel, as well as the preview mode. Choose which channels to see with the help of the buttons. You can also view the rendered image in monochromatic mode.

The RGB Button switches the current channel to RGB color by default. When effects are applied, such as the VRayDenoiser or Lens Effects, the button will toggle between the effectsResult channel and RGB color channel.

The "Switch to alpha channel" button toggles between the RGB color and alpha channel.

Saves the image into a single file. If a multi-channel type file is used (.exr, .vrimg) all the render elements will be saved in the same file.
Saves all the render elements into separate files.
Opens an image file to be previewed in the V-Ray Frame Buffer.
Clears the contents of the frame buffer. Sometimes helpful when starting a new render to prevent confusion with the previous image.
Copies the current V-Ray frame buffer to the Maya Render View.

Forces V-Ray to render the closest bucket found to the mouse pointer, when using the bucket sampler. If the progressive sampler is used, V-Ray samples the closest pixels next to the mouse pointer. Drag the mouse over the V-Ray frame buffer while rendering to change what part of the image is done first. You can turn this on and of on-the-fly while rendering.

Right-click on the rendered image and select "Lock bucket starting point" to lock it.

Allows you to render regions in the V-Ray VFB.
Links the V-Ray VFB to Pdplayer.

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Left click enables/disables the test resolution in the VFB. Right-click to bring up menu to select the percentage of the render resolution to set as the test resolution. Note: This only affects V-Ray and does not affect the native Maya test resolution setting found under Maya's Render menu.

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Enables the Debug shading/Isolate selected option in IPR. Left-mouse click and hold the button to open a context menu with the debug shading options.

Renders only the selected object(s), while the rest of the scene is rendered black.

Locks the selection to the currently selected object. This allows making changes to the scene while shading only the locked object. 

Renders only the light contribution in the scene.

Shows only the ambient occlusion in the scene.

Shows the rendered objects in wireframe.

Shows the normals of the rendered objects.

Displays the UV coordinates of the rendered objects in color grade.

Displays the Barycentric coordinates of the rendered objects.

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Starts interactive rendering. Right-click to access a list of available cameras from which to render. You can access this context menu even when the IPR is running and switch the view on the go.

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Pauses interactive rendering. When paused, IPR stops loading the CPU, but the engine will continue to run and keep track of changes to the scene. Clicking this button again resumes interactive rendering and applies any changes to the active IPR session.
Stops the current rendering
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Repeat the last render. Right-click to access a list of available cameras from which to render.

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Opens the Color Corrections dialog, which lets you define color corrections of various color channels. Right-click to dock or undock it.
Forces color clamping in the V-Ray VFB. Click and hold left mouse button to display the clamped colors in the V-Ray VFB.
Permanently opens the info dialog which will give you information about the pixel on which you right-click. If you right-click over a pixel without turning this setting on, you will see the info dialog only while your mouse button is pressed.
Enables the Hue/Saturation/Lightness color corrections.
Enables the color balance corrections.
Enables the levels color corrections.
Enables the curve color corrections.

Enables the exposure corrections.

Enables the use of a background image.
Displays the image in sRGB color space. Click and hold the left mouse button to switch between sRGB color space and ICC.
Enables and disables the effect of the Look Up table loaded in the Color Corrections settings. Hold down to choose between LUT and OCIO color corrections.
Shows the V-Ray VFB history window. Right-click to dock or undock it.
Enables visualization of the pixel aspect ratio.
Enables or disables stereoscopic preview. Click and hold down the left mouse button to pick between several stereoscopic modes.
Opens the Lens Effects controls. Right-click to dock or undock them.
UI Text Box

If an 8-bit file is saved through the VFB or the Render Output / Save image settings, the sRGB gamma curve is embedded and the image appears as in the frame buffer when loaded in an external image viewer. If a 32-bit (exr, hdr, tif) image is saved, it remains linear and relies on the external image viewer to handle the gamma.

 

Color Corrections

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The V-Ray VFB has robust Color Corrections controls (as seen in the image in the Overview) which are enabled with the icon () from the lower left corner of the VFB window. Color Corrections include Exposure, Hue/Saturation, Curves, etc. and are all covered here.

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