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This page provides information on Corona Interactive Rendering, its settings, and usage in Cinema 4D. 

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All of this can be done while rendering, without any kind of limitations. There is no need to manually restart or update the rendering, as it happens automatically. It runs completely on the CPU, so it has no limitations and does not require any special hardware. 

Starting Corona Interactive Rendering in a Floating Window

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To start the Interactive Rendering in a floating window, Go to the "Corona" menu at the top of the Cinema 4D Interface, and click

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"Interactive Rendering"

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Starting Corona Interactive Rendering from Corona > Interactive rendering.

 

 

Starting Corona Interactive Rendering in a Floating Window

 

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Corona Interactive Rendering in a floating (undocked) window.

 

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Starting Corona Interactive Rendering in

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the Active Viewport

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Starting Corona

To start the Interactive Rendering in the active (docked) viewport

from Corona Menu Bar.

 

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, Go to the "Corona" menu at the top of the Cinema 4D Interface, and click "Interactive viewport":

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Corona Interactive Rendering docked in the viewport.

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Interactive Rendering Performance Settings 

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UI Path: ||Render Settings|| > Performance settings tab > Interactive Rendering

Max Passes –Limits the maximum number of passes rendered in the interactive rendering mode.

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For interactive render regions, this value is best left at 0 to ensure that new or changed regions render (otherwise, they do not render if the max passes value has already been reached).

Force Path Tracing – When on, Path tracing is always used as a primary and secondary solver in interactive rendering. This keeps the interactive rendering responsive, avoiding the cost of UHD Cache precomputation.

Enable Motion Blur - This option is on by default, if this option is disabled then you will not be able to see motion blur in Interactive Rendering.

Fast Preview Denoise During Render – When enabled, the image is iteratively denoised during the render. This replaces a noisy render preview with a noiseless, albeit low-quality image that gets progressively refined as the render converges. It can help to get a quick estimate of the overall lighting in the scene.

 

 

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Interactive Rendering Preferences

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UI Path: ||Preferences|| >Corona > Interactive Rendering

# Of Threads Override – Number of cores to use for interactive rendering.

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Positive values work in a straightforward way, value of 0 uses all system cores, value of -1 uses all cores but 1, value of -2 uses all but 2, etc. 

Image Upscaling Factor – Specifies an upscaling factor for the image rendered during interactive rendering. By increasing this value, render resolution gets reduced which makes the interactive rendering more responsive. This is useful for High-DPI displays.

Maximum Resolution – This setting specifies the maximum resolution at which the interactive rendering will be displayed in the viewport.

IR Subsampling – The number of pixelated passes that are determined by the IR subsampling value.

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Interactive Rendering Denoising

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By default, your interactive rendering is denoised in real-time with the NVIDIA AI Denoiser ( fast preview denoise during render). The main purpose of this denoiser is to provide fast, noise-free previews. It is applied almost in real-time during interactive or regular rendering, and after the rendering is stopped. It requires a supported GPU to work, which is detected during the Corona installation.

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Fast preview denoise during render: disabled (left) and enabled (right).

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Region mode

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Multiple Regions mode

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Fuzzy Region mode

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Setting the DOF

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Focus Point from the VFB

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To set the Depth of Field focus point from Virtual Frame Buffer - enable the Pick mode in the VFB. Then right-click on an object in your rendering and select “Set camera focus object”. This snaps the current camera’s focus point exactly to the selected object center.
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Setting the DOF

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Focus Point from an

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Active Viewport

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To set the Depth of Field focus point from Active (docked) Viewport - start Interactive Rendering in Active Viewport. Then select the object Picker from the Camera Focus Object. Then left-click on an object in your rendering to set the object to focus. This snaps the current camera’s focus point exactly to the selected object center.

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Depth of Field Focus Value vs Focus Object

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 Select Camera Focus Value - This option allows you to manually set a numeric value for the focus distance from the camera. This might be helpful when you need precise control over the focus distance or when working with a scene that requires specific depth-of-field settings.

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 Select Camera Focus Object - This option allows you to choose a specific object in the scene to be the focus point. This option is useful when you want to easily define the focus point by directly clicking on the object in the scene, whether in the Virtual Frame Buffer (VFB) or Active Viewport. This automatically sets the camera's focus point exactly on the selected object center, making it the focal point of your render.

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