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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

go to the "Corona" menu at the top of the Cinema 4D

Interface,

interface and click

on

"Interactive Rendering"

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Starting Corona Interactive Rendering from Corona > Interactive rendering.

 

 

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Corona Interactive Rendering in a

Corona Interactive Rendering in a

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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 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

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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 enabledset to an option other than None, 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. There are two denoising modes available:

Fancy Bullets
  • Optix – Also known as "NVIDIA GPU AI" is a very fast denoiser that is available only on NVIDIA GPUs when the optional "NVIDIA AI Denoiser" Corona component has been installed.
  • Intel – Also known as "Intel GPU AI" or "Intel Open Image Denoise" is a slower denoiser but provides a higher quality result.

 

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In Corona 11, the Intel AI denoiser is supported only by Windows-based systems and its GPU mode only works on NVIDIA GPUs. 



 
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Interactive Rendering Preferences

 

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UI Path: ||Preferences|| > Renderer > 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, a value of 0 uses all system cores, a value of -1 uses all cores but 1, a 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.

Adjust render resolution to VFB – When enabled, the image output size is adjusted by the VFB window size. The adjustment is only available while the Interactive Rendering is running. If disabled, the VFB uses the image output size defined in the Output section from the Render Settings.

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Interactive Rendering Denoising

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By default, your interactive rendering is denoised in real-time with using the Optix (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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Render Selected

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UI Path: ||Render Settings window|| > General Settings > Render Selected (Pixel Mask)

If you need to change only one or a limited number of objects in the scene, you can save some render time by using the Render Selected (Pixel Mask) option. You can choose to either render only the objects selected in the viewport, or you can create an include/exclude list.

The selected objects render, and have correct shadows, GI, and reflections from other objects in the scene, which means they can be placed into or over a previous render and look as if they had been part of the initial full render.

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Any objects that were greatly influenced by GI bounces from the objects you want to re-render, or that showed those objects in refraction or reflection, also need to be included in the render selection so that they update as well.

 
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UI Expand
titleClick here to see the viewport selection

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UI Expand
titleClick here to see the viewport selection

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UI Expand
titleClick here to see the viewport selection

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Render Regions

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Corona offers drawing and rendering of regions in the Virtual Frame Buffer.

Select the "Region" mode and draw a region wherever you want. Use Click Click and Drag to Drag to add new regions. Ctrl + Drag on the region border enables ''Fuzzy" region mode, in which the regions are seamlessly blended into the rest of the image.

By clicking and holding your mouse over the Region button you can also toggle all regions on and off, and remove all existing regions.

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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 Focus Point from the VFB

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

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Focus Point from an Active Viewport

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To set the Depth of Field focus point from the Active (docked) Viewport to a specific point on any surface: start Interactive Rendering in the Active Viewport, then click on the picker next to the Camera Focus Distance, and then left-click anywhere in your rendering. This snaps the current camera focus point exactly to the selected point on the surface.

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

 
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