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Corona includes its ownVirtual Frame Buffer (VFB) window and 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 Corona VFB (legacy)

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Starting from Corona 12, the VFB 2.0 is the default Virtual Frame Buffer.

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Switching from VFB 2.0 to Legacy VFB

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ButtonDescription

Saves currently displayed image to a selected file.

Clicking the "arrow" icon next to the Save button displays the following available options:

Save– Saves currently displayed image to a selected file.

Save all–Saves each multipass (including the Beauty pass) as a separate file using a specified file format.

Save CXR– Stores all the information from the VFB (all render elements, including including the multipasses, the LightMix information, tone mapping,

denoising data, etc.) inside a single CXR file. To learn more about saving CXR files visit our Help Center.

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. 

Clicking the "arrow" icon next to the Render Region button displays the following available options:

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.

This drop-down list allows performing zoom actions.

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 – This checkbox locks the image aspect ratio when the IR is running.

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Keyboard shortcuts are available for zooming actions.

Ctrl + + – Zooms in

Ctrl + - – Zooms out

Ctrl + 0 – Zooms the image to 100%

Double-click (LMB) – Changes the VFB size to match the image size.

Start Interactive Rendering – Starts the Interactive rendering feature.

Stops the rendering process without discarding any additional data or post-rendering actions.

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When denoising is enabled, pressing the Stop button stops the rendering process and proceeds to denoising post-rendering actions.

Clicking the "arrow" icon next to the Stop button displays the following available options:

Stop – This is the same as the "Stop rendering..." button in the Cinema 4D Picture Viewer window. (this is the default action for the Stop button)

Cancel – Stops the rendering process, discards denoising or post-rendering actions, and skips saving output files (if were set up).

Starts the production rendering process.

Clicking the "arrow" icon next to the Render button displays the following available options:

Render – Starts rendering process. (this is the default action for the Stop button)

Resume last – Resumes last render.

Resume File – Resumes rendering based on a previously saved CXR file.

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This drop-down list allows selecting the multi-pass to be displayed in the VFB.



Post Tab

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

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Calculates optimal exposure based on rendered values without tone mapping. To see what exposure values is generated, remove exposure operator(s) in tone mapping and bake auto exposure into tone mapping.

White balance – Calculates optimal white balance based on rendered values without tone mapping. Bake to see the generated value.

Update during animation – If enabled, auto adjustments are calculated for each frame of sequence rendering. When disabled, auto adjustments are calculated only for the first frame of the sequence and stay unchanged.

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Auto Adjustment

Exposure –

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

White balance – Auto White Balance corrects the color temperature in your scene. It automatically adjusts to remove unwanted color tints, making sure colors look more natural no matter the lighting. The strength of this effect can be controlled by the value of the slider. It can also be applied to the White Balance operator in the Tone Mapping rollout using the Bake button.

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.

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Tone Mapping


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

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  • 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, which makes it more accurate and in-line with industry standard.

  • 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 & Glare

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Compute After Render – Enabling this checkbox allows –If enabled, the Bloom & and Glare effect to be computed only after the image rendered is completeis computed at the end of the rendering process, instead of during the whole rendering.

Size – Increases/decreases Bloom & 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 & Glare effect. Increasing the threshold applies Bloom & Glare only to the brighter pixels. Reducing it allows the Bloom & Glare effect to be applied to pixels that are less bright.

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

Color Shift – Changes the hue of the coloring added to the Bloom & 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 – Enabling this checkbox allows the use of the Editor button to fine-tune advanced Bloom & 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 the glare streak perpendicular to the streak direction.

Occlusion – Enables occlusion of part of aperture shape.

Ratio – Controls ratio of the 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.

Curvature – The arc of occlusion with the minimum value being straight line and the maximum value being full arc.

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 the aperture shape. This creates "halo" effect around lights in render.

Lens Scratches – Simulates scratches over the lens. Regular scratches can create additional glare effect, while irregular ones will effect affect 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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Button

Description

Store Current VFB – Stores the contents of the Store current VFB in contents into the history.

Loads content of a selected CXR file in the History – Loads a previously saved Load CXR file into the VFBhistory.

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Using the Corona VFB 2.0 allows for comparing images with different resolutions or aspect ratio.

Clear A/B – – Disables the history comparison and shows the current render only.

Show currently rendered image – Restores the last rendered image into the VFB. This option is only available if another image stored in the History that is different from the last rendered image is loaded for editing.

Delete All – – Deletes all items from the history and from the HDD.

Show with original postprocessing – Shows the stored content with original postprocessing.

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Additional actions can be performed on each individual image stored in the History. Available actions for images stored in the History are:


Show and edit this image reloads the selected image and editing its parameters one more time in the Post tab. 

Save current render element saves the selected image stored in the History to a specific location.

Resume in rendering of the current scene using the selected image as the new starting point.

Clears the selected image from the History but not from the HDD.

Deletes the selected image from the History and also removes it from the HDD.

Uploads this item to the Chaos Cloud Collaboration.
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LightMix Tab

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 After After at least one one LightSelect and one LightMix multi-passes are added to the scene, the interactive LightMix controls become active in the LightMix tab.

Additional actions can be performed for the LightSelect passes as follows:

Image Removed current Lightmix settings into the scene lights – Bakes the current Lightmix settings (intensities and colors) into the current Image Removed current Lightmix settings to a config file – Saves the current Lightmix settings into Image Removed Lightmix file – Loads Lightmix settings from a previously saved file.Set colors to white – Sets all LightSelect colors to pure white color. Each LightSelect element can be manually adjusted using the individual color box to launch the Corona Color Picker. 
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Bake
currently set Lightmix colors/intensities into the scene lights.

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

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Load
light mix settings from a config

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Enable/Disable LightSelect elements – Enables or disables all configured LightSelect elements. If all entries or some of them are disabled, then this enables all of them. If all entries or some of them are enabled, then this disables all of them.

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Set intensities to 1 – Set all intensities to a value of 1.0

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file to the currently displayed light mix element.

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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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Set all colors to white.


Additional Tips:

  • LightMix colors can be copied by dragging and dropping a color swatch onto another swatch.

  • LightMix colors can be reset to pure white by right-clicking on a swatch.

  • You can also right-click on the light names on the LightMix list in the Corona VFB to select a specific light in the scene, add that light to the current selection, or remove that light from the current selection.


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When using the Corona VFB 2.0, multiple Lightmix multipasses can be loaded, allowing different setups for each Lightmix element.

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Starting from Corona 12 Update 1 , Collaboration features from Chaos Cloud Collaboration is are supported in Corona for Cinema 4D. With the Cloud Collaboration tools, you can easily share drafts and final renders with customers and team members. The Collaboration tools from Chaos Cloud Collaboration also supports support mark-up discussions, version control, and more, allowing for efficient and seamless project coordination in real-time.

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


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