V-Ray frame buffer
Search Keywords: VFB, G-buffer, frame buffer, render pass
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:
- Allows you to view all render elements in a single window and switch between them easily;
- Keeps the image in full 32-bit floating-point format;
- Allows you to perform simple color corrections on the rendered image;
- Allows you to choose the order in which the buckets are rendered.
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.
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.
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. This is helpful when starting a new render, to prevent confusion with the previous image. Copies the currently displayed image into the Maya frame buffer 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. Allows you to draw render regions in the V-Ray VFB. Links the V-Ray frame buffer to Pdplayer. Swaps the A and B images 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 Starts a new rendering 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. When clicked, color values that exceed the limits will be "clamped" to the maximum possible ones. 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. Enables and disables the effect of the colors level correction. Enables and disables the effect of the colors curve correction. Enables and disables the effect of the exposure correction. This button shows the image in sRGB color space. 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 Enables or disables the pixel aspect Enables or disables stereoscopic preview. Hold down the left mouse button to pick between several stereoscopic modes. Brings forth the V-Ray Lens Effects controls
In 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.
|enables the V-Ray VFB history|
|saves the current image from the VFB to the render history|
|loads the image selected in the Render history to the VFB|
|removes the selected image from the render history|
|sets the currently selected image as image A for A/B comparison in the VFB|
|sets the currently selected image as image B for A/B comparison in the VFB|
|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|
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
- At present, the V-Ray VFB is not supported within Maya on the Linux and Mac OS X operating systems for Maya 2010 and below. Under these operating systems you can use the V-Ray VFB only with the V-Ray Standalone application. For Maya 2011 and later, the V-Ray VFB is supported on all platforms.