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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

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to Legacy VFB

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It is possible to switch from the new VFB 2.0 to the Legacy VFB.

To switch between VFB 2.0 and the Legacy VFB:

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  • Navigate to the Corona menu → Preferences → VFB Settings → VFB Version and use the dropdown list to select the desired VFB version.
    Note: Alternatively, you can manually navigate to the Cinema 4D preferences → Renderer → Corona → VFB Settings → VFB Version
  • Once the VFB Version is selected, reboot Cinema 4D.
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Corona VFB 2.0 Buttons

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ButtonDescription

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Saves currently displayed image to a selected file.

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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 the LightMix, tone mapping, denoising data, etc.) inside a single CXR file.

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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).

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Saves currently displayed image to a selected file.

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Copies the VFB content to the host app frame buffer.

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Copies currently displayed image into clipboard. 

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Erases currently displayed image.

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Activates mode for editing the render regions. 

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

Disable All – Disables all selected regions.

Delete all – Removes all selected regions.

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

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Hides/shows tools sidebar.

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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.

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 the LightMix, tone mapping, denoising data, etc.) inside a single CXR file.

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Copies the VFB content to the host app frame buffer.

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Copies currently displayed image into clipboard. 

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Erases currently displayed image.

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Activates mode for editing the render regions. 

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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.

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

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Hides/shows tools sidebar.

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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.

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Starts the production rendering process.

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Clicking the "arrow" icon next to the

Render

Stop button displays the following available options:

Render – Starts rendering process

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)

Start IR – Starts Interactive Rendering.

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.

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

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Starts the production rendering process.

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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)

Start IR – Starts Interactive Rendering.

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.

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This drop-down list allows performing zoom actions.

Zoom in – Zooms the image in.

Zoom

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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.

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 After at least 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:

Button

Description

Bake current Lightmix settings into the scene lights – Bakes the current Lightmix settings (intensities and colors) into the current scene lights.

Save current Lightmix settings to a config file – Saves the current Lightmix settings into a config file.

Load Lightmix settings from a config file – Loads Lightmix settings from a previously saved file.

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

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Troubleshooting

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

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

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Switching from VFB 2.0 to Legacy VFB

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It is possible to switch from the new VFB 2.0 to the Legacy VFB.

To switch between VFB 2.0 and the Legacy VFB:

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  • Navigate to Cinema 4D preferences → Renderer → Corona → VFB Settings → VFB Version and use the dropdown list to select the desired VFB version.
    • Once the VFB Version is selected, reboot Cinema 4D

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