This page provides information on the New V-Ray Frame Buffer and its features.
Overview
The New VFB is much more than a render image holder window. The new enhanced version provides a higher level of post processing adjustments and ability to modify your scene from inside the new VFB. Here is a list of old and new benefits you should know:
- Image preview:
Loads render elements channels via a dropdown list;
Works with display corrections;
Loads various 8bit and 32bit file formats, including V-Ray resumable files;
Image comparison between 2 or 4 renders;
- Image management:
Keeps the rendered image in full 32-bit floating point format;
Can store history of rendered images with their post rendering corrections;
Can save corrected output to various image formats;
- Image editing and post processing:
Set Color Corrections to rendered image and its elements;
Composite mode for Back to Beauty workflow including layers corrections;
LightMix control on lights contribution in the rendered image;
- Scene editing:
Can modify actual lights values by transferring updated intensity and color from LightMix mode;
IPR camera navigation and focus control from inside VFB;
- Render management:
Denoiser control;
Region rendering control and test resolution;
Allows you to choose the order in which the buckets are rendered;
Automatic render resolution adjustment in IPR when the new VFB window is resized;
To use the VFB for rendering, create a V-Ray Renderer node.
New VFB also has some limitations which are listed in the New V-Ray Frame Buffer section below.
||V-Ray Shelf|| > Show VFB
V-Ray menu > Show VFB
VFB Menu
The V-Ray Frame Buffer menu holds the main frame buffer commands. Some of the options are also available in the VFB toolbar for a quick access.
Menu | Menu Options |
|---|---|
File | Save current channel – Saves the currently loaded channel to an image file format. Save all image channels to separate files – Saves all the render elements to separate files. Save all image channels to single file – Saves the image to a single multi-channel EXR or .vrimg file. Load image – Opens an image file to be previewed in the V-Ray Frame Buffer. |
Render | Start interactive rendering – Starts IPR. Abort rendering – Stops the current rendering. Render – Starts rendering. |
Image | Follow mouse – Renders the closest bucket found to the mouse pointer, when using the bucket image sampler. If the progressive sampler is used, V-Ray samples the closest pixels to the mouse pointer. Follow mouse – Drag the mouse over the VFB while rendering to change what part of the image is sampled first; Copy current channel to clipboard – Copies the current channel to the clipboard. Clear image – Clears the contents of the frame buffer. This is useful when starting a new render to prevent confusion with the previous image. |
View | Display color space –Specifies the color space, in which the image is displayed. None – Does not specify a color space; Zoom VFB – Zooms in/out the rendered image in the VFB. Zoom 50% – Zooms out to 50%; Channels – Chooses which channels to see. View red channel – Displays the red channel; Color clamping – Opens the color clamping submenu options: Force color clamping – Forces color clamping; Use pixel aspect – Enables visualization of the pixel aspect ratio. Stereo – Enables stereoscopic preview. You can view the image in stereo in red/cyan or green/magenta. |
Options | VFB settings – Opens the VFB Settings window where you can adjusts settings for Render View, Render Region, History and Layers. |
VFB Toolbar
| This dropdown 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 also appear in the drop-down. | |
| Displays the coordinates of the mouse pointer. | |
| Specifies the sampled area size. Click on the arrow to open a context menu with the available sampled area sizes: 1x1, 3x3, 5x5, and 7x7. | |
| Specifies the color of the pixel under the current mouse position before applying any color corrections. | |
| Displays the RGB pixel values at the current mouse pointer position before applying any color corrections. | |
| Specifies RGB values. Click on the arrow to open a context menu with the available option. None – Does not specify the RGB value. | |
| Displays the Hue, Saturation and Value of the pixel under the current mouse position when HSV is selected. | |
| Displays the HEX of the pixel under the current mouse position when Web is selected. | |
| Displays the 8bit color palette of the pixel under the current mouse position when 8bit is selected. | |
| Locks the mouse pointer coordinates and displays information for the selected pixel. | |
| Shows corrected colors. | |
| Shows the V-Ray log. | |
| Displays the Alpha channel. | |
| Saves the image to disk. Press and hold the icon to bring up the submenu: Save current channel – Saves the current channel to an image file format; | |
| Clears the contents of the frame buffer. This is useful when starting a new render to prevent confusion with the previous image. | |
| Renders the closest bucket found to the mouse pointer, when using the bucket image sampler. If the progressive sampler is used, V-Ray samples the closest pixels to the mouse pointer. With this option enabled, you can right-click on the image and select Lock bucket starting point to lock the bucket (or sampling) starting point. | |
| Allows you to render regions in the VFB. See the New V-Ray Frame Buffer section for more information. | |
| Starts IPR. | |
| Stops the current rendering. | |
| Starts rendering. | |
Render History
The V-Ray VFB keeps a history of previously rendered images, and lists each with a number, thumbnail, and textual details in the Render history panel. Up to four images can be called from the history to be compared in the VFB (as shown below). History files are stored as .vrimg files in a user-specified folder. Render history settings can be configured in the VFB Settings window.
| Enables or disables image A/B vertical comparison. Select images A and B from the render history. |
|---|---|
| Enables or disables image A/B horizontal comparison. Select images A and B from the render history. |
| Enables or disables image A/B/C/D comparison. Select images A, B, C and D from the render history. |
| Saves the current image from the VFB to the render history. The image is placed at the top of the render history list. |
| Loads the selected image from the render history to the VFB. |
| Removes the selected image from the render history. |
| A search field where you can filter the images based on the scene paths and notes. The filter text is selected when pressing the Enter from the keyboard. |
The keyboard keys from 1 to 9 can be used to quickly load the first 9 images from the history to the VFB.
The History panel with notes/name, resolution/time, and shortcut key info displayed.
Right-clicking on an image in the VFB history brings up a pop-up menu with some useful options.
Edit note – Allows you to add a text comment to the image; the comment appears below the image.
Set A – Sets the render as A image for A/B comparison.
Set B – Sets the render as B image for A/B comparison.
Load to VFB – Loads the selected image in the VFB (same as double-clicking on the image).
Delete – Deletes the selected image from history. The image is moved to the system's Recycle Bin and can be restored from there if needed.
Load layers – Loads the layer tree preset of the selected image.
Load V-Ray settings – Loads the V-Ray settings used for the saved render.
Compare V-Ray settings – Opens the Compare V-Ray settings dialogue, where you can compare the render settings of saved renders.
Open scene – Opens the rendered scene in the viewport. This option works as long as the initial file path of the scene has not changed after the render.
Copy scene path – Copies the full path to the scene.
Reload history – Re-reads the history image list. This may be needed if the history folder is updated outside of Houdini (f.e. from another Houdini session).
Manually saved .vrimg files can also be added to the History folder, but they need to be saved with all image channels in one .vrimg file to keep the complete image info.
Layers
The redesigned V-Ray Frame Buffer includes a suite of color corrections and tools for adjusting the image. The tools are added as layers and displayed in a layer tree. You can enable or disable a particular tool using the visibility icon (
) to the left of its name.
For more information on using the Layers, see the Layers page.
| Creates a layer. Multiple layers of the same type can be added. Folder – Allows grouping multiple layers; For more information, see the Layers page. |
| Deletes the selected layer(s). |
| Saves a layer tree preset. |
| Loads a layer tree preset. |
| Quick access to custom layer presets. You must set the path to it in the VFB Settings. |
| Undo various actions related to layers such as create, delete, reorder or modify a layer. |
| Redo various actions related to layers such as create, delete, reorder or modify a layer. |
Stats
The V-Ray Frame Buffer allows monitoring of different statistics and information about your scene in the Stats panel. The exact contents of the Stats changes depending on the scene, the rendering mode (interactive vs production, bucket vs progressive) and others.
Right-click to display a context menu, allowing you to copy the Stats values.
VFB Shortcuts
These shortcuts navigate through the VFB image. Please note that the VFB window must have the current focus for the shortcuts to have effect:
| Shortcut Key | Description |
|---|---|
| Double-click left button | Zoom to 100% |
| Ctrl+Shift+Left click | Zoom in the rendered image |
| Ctrl+Shift+Right click | Zoom out the rendered image |
| + / = | Zoom in |
| -/_ | Zoom out |
| * | Zoom to 100% |
| Arrow keys | Pan left, up, right, down |
| F | Fit region or whole image in the VFB |
| Esc | Abort render |
| Q | Enable history A/B vertical compare mode |
| W | Enable history A/B horizontal compare mode |
| E | Enable history A/B/C/D compare mode |
| 1-9 | Load the respective image from the new VFB history |
| H | Show/hide history |
| L | Show/hide whole right panel |
| P | Show/hide only layers tree |
Note that the keyboard shortcuts work only within the VFB window.
Render Region
Region rendering can be used in both IPR and Production modes to isolate only part of the frame for rendering. Usually, when a render region is used, you would like to save the whole frame instead of the region only.
Saving single channel .exr files ignores the render region and always saves the full frame. This applies when saving the .exr through VFB.
Saving multi-channel .exr files writes just the render region data in the file by default but it can be set to save full frame instead. In order to save the render region with the rest of the frame, set its exr data window option to Whole Image. Saving multi-channel .exr files from VFB > Save all channels to single file saves the render region when it is enabled from the VFB. This happens even if you have selected a render region on top of the already rendered frame, without an actual region used in the rendering process. To save the full frame from VFB, disable the render region.
Notes
- New VFB does not display the G-Buffer layers (like Coverage etc.)
- New VFB does not work with strip rendering
- New VFB does not work with rendering to fields
- The OpenEXR file format is an open file format for high dynamic range images originally developed by Industrial Light and Magic. The official site of the OpenEXR file format is http://www.openexr.com/
- If Lens Effects or the VRayDenoiser render element are enabled, then the RGB Color channel is saved with the name RGB_color and the effectsResult channel is saved as effectsResult when saving all channels from VFB.
- If an 8-bit file is saved through the VFB or the Render Output / Save image settings, the color space (for example sRGB) 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 display color space.
- The VFB test resolution is ignored for command-line rendering and Backburner jobs. The Test Resolution button is inactive in IPR if Fit resolution to VFB is enabled.