General

VFB toolbar

VFB shortcuts

Notes

 

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

General

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

In order to use the V-Ray VFB you need to check the Use V-Ray VFB check box in the Output tab in the Renderer Options window.

Use V-Ray VFB

VFB toolbar

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.

 

This will save the current frame data to a file. You can turn this on and off on-the-fly while rendering.

Opens a file to be viewed 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.
This option allows you to render regions in the V-Ray VFB.
This will force 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.
Transfers the content of the frame buffer into Pdplayer
Enables diagonal A/B comparison when A and B images have been selected in the history
Enables vertical A/B comparison when A and B images have been selected in the history
This opens permanently 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 - then you will see the info dialog only while your mouse button is down.
Corrections Control This will open 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.
Force color clamping When this button is clicked color values that exceed the limits will be "clamped" to the maximum possible ones.
Use color level correction This button enables and disables the effect of the colors level correction.
Use colors curve correction This button enables and disables the effect of the colors curve correction.
Use exposure correction This button enables and disables the effect of the exposure correction.
Display colors in sRGB space This button shows the image in sRGB color space.
Enables or disables the currently loaded Look Up Table
Enables or disables pixel aspect
Enables the stereo display - red/cyan
Lens Brings out the Lens Effects options

VFB Lens Effects

The V-Ray Lens Effects allows the user to simulate bloom and glare lens effects by fitlering the rendered image with a filter kernel. It uses fast multithreaded technique to compute the result.

 

VFB Lens EffectsBloom Effects

 

On - turns on the bloom lens effect.

 

Fill edges - enabling this option will add pixel data outside the edges of the original image. This will remove the darkening around the edges.

 

Mode - determines if the bloom will be applied to the RGB image, stored in a separate render element, or both.

 

Weight - specifies the strength of the interpolation between the filtered image and the original image.

 

Size - specifies the size of the filter as percentage of the image's width.

 

Shape - specifies the fall off of the filter.

 

Bloom mask

 

The opitons in this group allow the user to control where the bloom effect will be applied

 

Intensity - when enabled the bloom effect will be applied only to pixels with intensity equal to or higher than the specified value.

 

Object ID - when enabled the bloom effect will be applied only to objects with the specified object ID

 

Material ID - when enabled the bloom effect will be applied only to objects that have the material with the specified object ID

 

Glare Effects

 

On - turns on the glare lens effect.

 

Fill edges - enabling this option will add pixel data outside the edges of the original image. This will remove the darkening around the edges.

 

Type - this parameter specifies how the glare is computed. The possible values are:

 

From image - takes the image specified in Bitmap as filter kernel.

 

From render camera - takes the necessary parameters from the camera used to perform the rendeirng and automatically generates the filter kernel.

 

Glare type from camera params - takes the camera parameters specified in the VRayLensEffects render effect itself and automatically generates the filter kernel.

 

Mode - determines if the glare effect will be applied to the final image, stored into a separate render element, or both. Storing to a render element only works when the V-Ray VFB is enabled.

 

Weight - specifies the strength of the interpolation between the filtered image and the original image.

 

Size - specifies the size of the filter as percentage of the image's width.

 

Glare image - path to the filter kernel. Available if From image option is selected. You can create filters using Filter generator which comes with V-Ray for 3ds Max instalation.

 

Turn on diffraction - this option will turn the diffraction on, producing colored patterns in the glare.

 

Use obstacle image - enable the use of the obstacle image specified in the field below.

 

Camera parameters

 

These options are available when the glare Type is set to Glare type from camera params and affect the final look of the glare effect.

 

f-number - the f-number used to calculate the glare. Larger values produce smaller camera aperture and stronger glare effects.

 

Blades - this parameter controls if the camera aperture has any blades and how many they are. This effect directly controls the "rays" of the glare.

 

Blades rotation - this parameter controls the rotation of the of the camera aperture blades.

 

Glare Mask

 

The opitons in this group allow the user to control where the glare effect will be applied

 

Intensity - when enabled the glare effect will be applied only to pixels with intensity equal to or higher than the specified value.

 

Object ID - when enabled the glare effect will be applied only to objects with the specified object ID

 

Material ID - when enabled the glare effect will be applied only to objects that have the material with the specified object ID

 

Update control

 

Interactive - when enabled the Bloom and Glare effects are updated each time a setting is changed.

 

Update effects - manually updates the Bloom and Glare effects

 

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+Left Click, CTRL+Right Click Zoom in/Zoom out
Roll the mouse-rollon button up/down Zoom in/Zoom out
Double-click Left Button Zoom to 100%
Right Click 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
Mid Button dragging view pan (hand tool)
   
Keyboard Description
+ / - Zoom in/Zoom out
* Zoom to 100%
Arrow keys Pan left, up, right, down

 

Notes