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Corona 12 introduces the new Virtual Frame Buffer (VFB) 2.0 with an updated interface that has been tuned to the most common needs of artists and can provide a very decent post-production experience and results.

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The Corona VFB 2.0 is only available starting from Corona 12; older Corona versions use the legacy Corona VFB.

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Starting from Corona 12, the VFB 2.0 is the default Virtual Frame Buffer. If you want to switch to the old Corona VFB, you can do it from Corona by going to Render Setup > System > System Settings > VFB Settings > and selecting Corona VFB.

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Corona VFB (Virtual Frame Buffer) 2.0.

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ButtonDescription

Saves currently displayed image to a selected file.

Press and hold the vertical bar icon:

Save – Saves currently displayed image to a selected file.

Save all–Saves each render element as a separate file using a specified file format.

Save CXR–Stores all the information from the VFB (all render elements, including the LightMix, tone mapping, denoising data, etc.) inside a single CXR file.

Copies the VFB content to the host app frame buffer.

Copies currently displayed image into clipboard.

Erases currently displayed image.

Activates mode for editing the render regions.

Press and hold thevertical baricon:

Disable All – Disables all selected regions.
Delete all – Removes all selected regions.

Activates pick mode for selecting objects and setting of camera focus point.

Hides/shows tools sidebar.

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Start IR–StartsInteractive Rendering.

Stops current rendering, but applying postprocessing effects.

Press and hold thevertical baricon:

This is the same as the 3ds Max Stop and Cancel buttons in the 3ds Max rendering dialog - whendenoisingis enabled, pressing the Stop button stops the rendering process and proceeds to denoising.
However,Cancelbutton stops render and discards denoising or post-rendering actions as well as skips saving output files (if were set up).

Starts production rendering.

Press and hold thevertical baricon:

Render – Starts production rendering.
Start IR–Starts Interactive Rendering.
Resume lastResume Last – Resumes last render.
Resume fileFile – Resumes rendering based on a previously saved CXR file.

Selects currently displayed render elements.

Displays the current zoom percentage of the image.

Click on the 100% button:

Zoom in – Zooms the image in.
Zoom out – Zooms the image out.
Zoom to 50% – Zooms the image to 50%.
Zoom to 100% – Zooms the image to 100%.
Zoom to 200% – Zooms the image to 200%/
Lock IR resolution – When enabled, the IR resolution will not change during resizing of VFB window, or when restarting rendering. 

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You can also use keyboard shortcuts to control zoom level:

  • Zoom in: CTRL and +
  • Zoom out: CTRL and -
  • Zoom to 100%: CTRL and 0

Post Tab

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Tone Mapping

The Tone Mapping rollout lists the currentlyaddedTone Mapping Operators. By default, it includes the following operators:
  • Simple Exposure
  • White Balance
  • Green-Magenta Tint
  • Contrast
  • Saturation
  • ACES OT
"+" button– Displays the list of all available Tone Mapping Operators and allows to add one.Reset button– Resets the current Tone Mapping Operators stack to the default configuration.

Presets button – Displays the list of built-in tone mapping presets.

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Saves current postprocessing settings into a file.Loads postprocessing settings from specified file .
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Bloom and Glare

Auto Adjustment

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Exposure– Auto Exposure in VFB 2.0 automatically adjusts the brightness of your render. Instead of changing settings like ISO, f-stop, and shutter speed yourself, Corona looks at the lighting in your scene and sets these values for balanced exposure. The strength of this effect can be controlled by the value of the slider. It also can be applied to the Simple Exposure in the Tone Mapping using the Bake.

White Balance– Auto White Balance corrects the color temperature in your scene. It automatically adjusts to remove unwanted color tints, making sure colors look natural no matter the lighting.It also can be applied to the White Balance in the Tone Mapping using the Bake.

Update during animation– This option updates the enabled Auto adjustment for each frame of the animation. This feature is especially helpful when the camera moves into a brighter area, such as from an indoor scene to a bright outdoor scene.

Tone Mapping

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Saves current postprocessing settings into a file.Loads postprocessing settings from specified file .

The Tone Mapping rollout lists the currentlyaddedTone Mapping Operators. By default, it includes the following operators:

  • Simple Exposure

  • White Balance

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    Starting from Corona 12 Update 1, the White Balance operator has been deprecated and is now called "Legacy White Balance." The new White Balance operator uses Bradford's chromatic adaptation formula.

  • Green-Magenta Tint
  • Contrast
  • Saturation
  • ACES OT

"+" button– Displays the list of all available Tone Mapping Operators and allows to add one.

Reset button– Resets the current Tone Mapping Operators stack to the default configuration.

Presets button– Displays the list of built-in tone mapping presets.


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Bloom and Glare

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Compute After Render – Determines if bloom and glare will be computed during rendering or at the end of it.

Size – Increases/decreases bloom and glare size.

Bloom Intensity – Increases/decreases bloom intensity.

Glare Intensity – Increases/decreases glare intensity.

Threshold – Controls the minimum brightness which is considered for the Bloom and Glare effect. Increasing the threshold applies Bloom and Glare only to the brighter pixels. Reducing it allows the Bloom and Glare effect to be applied to pixels that are less bright.

Color Intensity – Controls how saturated the Bloom and Glare effect is. Higher values mean higher saturation.

Color Shift – Changes the hue of the coloring added to the Bloom and Glare effect.

Streak Count – Defines the number of streaks for the glare effect.

Rotation – Rotation of the glare effect in degrees.

Streak Blur – Decides whether the glare streaks should

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Compute After Render – Determines if bloom and glare will be computed during rendering or at the end of it.

Size – Increases/decreases bloom and glare size.

Bloom Intensity – Increases/decreases bloom intensity.

Glare Intensity – Increases/decreases glare intensity.

Threshold – Controls the minimum brightness which is considered for the Bloom and Glare effect. Increasing the threshold applies Bloom and Glare only to the brighter pixels. Reducing it allows the Bloom and Glare effect to be applied to pixels that are less bright.

Color Intensity – Controls how saturated the Bloom and Glare effect is. Higher values mean higher saturation.

Color Shift – Changes the hue of the coloring added to the Bloom and Glare effect.

Streak Count – Defines the number of streaks for the glare effect.

Rotation – Rotation of the glare effect in degrees.

Streak Blur – Decides whether the glare streaks should be sharper or more blurry.

Custom Aperture – Launches an editor which can be used to fine-tune advanced Bloom and Glare options.

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Sides – Sets the number of aperture blades used for custom aperture. When disabled, the circular aperture is used instead.

Rotation – Rotation in bladed aperture in degrees.
Streak Blur – Controls the blurring of glare streak perpendicular to the streak direction.

Occlusion – Enables occlusion of part of aperture shape.

Ratio – Controls ration of aperture being occluded, with the minimum value meaning no occlusion and the maximum value meaning full occlusion.
Rotation – Controls the rotation of the occlusion in the degrees.
Arc – The arc of occlusion with the minimum value being straight line and the maximum value being full arc.

Symmetric – When enabled, occlusion is applied symmetrically from both sides of the aperture.

Reset all – Resets the setting to default value.


Peripheral Grating – Enables grating along the sides of aperture shape.

Lens Scratches – Simulates scratches over the lens. Regular scratches can create additional glare effect, while irregular ones will effect shape and blur of existing glare effect.

Lens Dust – Simulates dust particles over the lens. Dust can create effect similar to bloom that is affected by overall pattern of generated particles.

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Sharpen amount–The value that is used to control sharpening.

Sharpen radius– Defines the sharpness radius.

Blur radius – Defines the radius of blur.

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In VFB 2, it is possible to compare images with different resolutions or aspect ratios.

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VFB 2 provides two options to open CXR files: by using the history tab or through the drag-and-drop feature.

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ButtonDescription

Stores content of the current VFB into the history.

Loads content of selected CXR file in the history.

Disables the history comparison and shows only the current render.

Shows currently rendered image.

Removes all items from the history and optionally from HDD.


Show with the original postprocessing – Determines which postprocessing is used when comparing images: the one used when the original image was saved or the one currently used in the VFB Post tab.

ButtonDescription

Show and Edit this image.

Save current render element.

Resume rendering of the current scene using this history item as starting point.

Clear this item from history, but do not delete it from file system.

Delete this item from history, and also from the file system.

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Uploads this item to Chaos Collaboration.
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The LightMix tab is enabled as soon as at least one LightSelect and one LightMix render element are added to the scene. For more information, see: Corona LightMix.

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With the new VFB 2.0, it is possible to create and manage multiple LightMix setups within a single render by manually adding multiple LightMix render elements.

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Bake currently set light mix colors/intensities into the scene lights.

Save settings of the current displayed light mix element to a config file.

Load light mix settings from a config file to the currently displayed light mix element.

Enables all entries if some are disabled or disables all if all are currently enabled.

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Set all intensities to 1.

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currently enabled.

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Set all intensities to 1.

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Set all colors to white.
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Collab Tab

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Starting from Corona 12 Update 1 Chaos Cloud Collaboration is supported in Corona for 3ds Max. With Cloud Collaboration, you can easily share drafts and final renders with customers and team members. The Chaos Cloud Collaboration also supports mark-up discussions, version control, and more, allowing for efficient and seamless project coordination in real-time.

To learn more about how to use Chaos Cloud Collaboration please visit this page.

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