General

VFB toolbar

VFB history

VFB shortcuts

Notes

 

Search Keywords: VFB, G-buffer, frame buffer, render pass

General

In addition to rendering to the Maya® Render View, V-Ray allows you to render to a V-Ray specific frame buffer, which has some additional capabilities:

The V-Ray VFB also has some limitations, which are listed in the Notes section below.

 

In order to use the V-Ray VFB you need to check the Use V-Ray VFB check box under the Resolution rollout in the V-Ray Common Tab in the Render Settings window.

Use V-Ray VFB

VFB toolbar

VFB Channels 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.

 

VFB Save Image 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.
VFB Safe Image Channels Saves all the render elements into separate files
VFB Open File Opens an image file to be previewed in the V-Ray Frame Buffer
VFB Clear Image Clears the contents of the frame buffer. This is helpful when starting a new render, to prevent confusion with the previous image.
VFB Copy Image to Maya Frame Buffer Copies the currently displayed image into the Maya frame buffer
VFB Enable Mouse Tracking Forces V-Ray to render the closest bucket found to the mouse pointer. Drag the mouse over the V-Ray frame buffer while rendering to specify which buckets are rendered first. You can turn this on and off on-the-fly while rendering.
VFB Render Region Allows you to draw render regions in the V-Ray VFB.
VFB Link to Pdplayer Links the V-Ray frame buffer to Pdplayer.
VFB Swap A/B Swaps the A and B images
VFB Comapre A/B Enables or disables the comparison of images A and B from the VFB history. Hold down the left mouse button to change between horizontal and vertical comparison
VFB Render Starts a new rendering
VFB Settings Opens the "Color Corrections" dialog which will let you define color corrections of various color channels. It will also show the histogram of the currently contained image data in the buffer. Click and drag your mid-button in the histogram to interactively scale the preview.
VFB Force Color Clamping When clicked, color values that exceed the limits will be "clamped" to the maximum possible ones.
VFB Pixel Info Permanently opens the info dialog which will give you information about the pixel you right-click the mouse pointer on. If you right-click the mouse pointer over a pixel without turning this setting on you will see the info dialog only while your mouse button is down.
VFB Levels Color Corrections Enables and disables the effect of the colors level correction.
VFB Color Curves Correction Enables and disables the effect of the colors curve correction.
Enables and disables the effect of the exposure correction.
VFB Enable sRGB color space This button shows the image in sRGB color space.
 VFB Enable Look Up Table Enables and disables the effect of the Look Up table loaded in the Color Corrections settings. Hold down to chose between LUT and OCIO color corrections.
Shows the VFB History window
VFB Enable Pixel Aspect Enables or disables the pixel aspect
VFB Stereoscopic Preview Enables or disables stereoscopic preview. Hold down the left mouse button to pick between several stereoscopic modes.
Enable Lens Effects Brings forth the V-Ray Lens Effects controls

History

VFB History WindowIn V-Ray 2.0 the V-Ray VFB allows the user to keep a history of previously rendered images. The images are stored as .vrimg files on a location specified by the user. In addition to keeping history this feature allows the user to set A and B image and compare them inside the VFB.

Enable VFB History enables the V-Ray VFB history
VFB Save button saves the current image from the VFB to the render history
VFB Load button loads the image selected in the Render history to the VFB
VFB Delete button removes the selected image from the render history
VFB Set A button sets the currently selected image as image A for A/B comparison in the VFB
VFB Set B button sets the currently selected image as image B for A/B comparison in the VFB
VFB Options brings out the VFB history options which allow the user to specify the location where the history will be saved and the amount of disk space available

 

VFB shortcuts

Here is the list of shortcuts you can use to navigate through the VFB image. Please note that the VFB window must have the current focus for the shortcuts to work:

 

Mouse Description
CTRL+LeftClick, CTRL+RightClick Zoom in/Zoom out
Roll the mouse-rollon button up/down Zoom in/Zoom out
Double-click LeftButton Zoom to 100%
RightClick Show the info dialog with the properties of the last pixel clicked. In order to see the info non-stop - turn on the info dialog button
MidButton dragging view pan (hand tool)
   
Keyboard Description
+ / - Zoom in/Zoom out
* Zoom to 100%
Arrow keys Pan left, up, right, down

 

Notes