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

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.

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

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.

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

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.

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

Region mode

Multiple Regions mode

Fuzzy Region mode

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.

 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.

 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.