To start the Interactive Rendering in a floating window, click the "Start Interactive rendering in Corona VFB" button on the Chaos Corona Toolbar or go to the Render Setup > Scene rollout and click Start Interactive.
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Starting Corona Interactive Rendering from Render Setup > Scene rollout.
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 to 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.
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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UI Path: ||RenderSetupwindow|| > System tab > SystemSettings > InteractiveRendering
# 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.
IR Subsampling – The number of pixelated passes that are determined by the IR subsampling value.
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.
Enable Material Editor – Enables rendering of material editor shader balls during interactive rendering.
Dissolve with previous Image – When enabled, the newly rendered image gradually dissolves into the old image. When disabled, the new rendered image appears only after it has completely replaced the old image (i.e. after one pass).
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 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.
