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


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Corona Interactive Rendering in a floating (undocked) window.

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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 set 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:

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  • 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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The Intel GPU AI denoiser is currently available for 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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Corona offers drawing and rendering of regions in the Virtual Frame Buffer.

Select the "Region" mode and draw a region wherever you want. Click and Drag 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 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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