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Blender Viewport

• Viewport Rendering
• Viewport Shading: Rendered
• Progressive vs Bucket rendering
• Optimizing for speed
• Viewport Size
• Progressive Passes and Undersampling
• Render Region

Viewport Rendering

Viewport Shading: Rendered

There are two viewport modes that Redshift can render with (Material Preview and Rendered) but it is recommended to use the Rendered mode as outlined in the image below.

Using the Rendered viewport mode

Progressive vs Bucket rendering

Bucket rendering can be enabled for viewport rendering by disabling "Force Progressive for IPR" (1) in the Output > Progressive Rendering section of the Render Properties panel.

• Progressive (default) - Intended for fast interactive feedback that favors speed over clean renders.
• Bucket - Intended for high quality final renders that favors high quality clean renders over speed.

Forcing bucket rendering in the viewport

For more information please see the Sampling page.

Optimizing for speed

Viewport Size

The size of the viewport will have a direct impact on viewport rendering speed, a smaller viewport will render faster than one that takes up more screen space.

Super fast viewport rendering	Still very fast - just a little less so

Progressive Passes and Undersampling

When rendering in progressive mode increasing the "IPR Undersampling" value can increase the responsiveness of viewport updates

Lower "Progressive Passes" values can reduce the amount of time it takes for a render to reach 100% at the expense of noise.

Adjusting Passes and IPR Undersampling for progressive rendering

Render Region

When enabled, the "Render Region" option (1) in the Output Properties panel will crop the viewport to the render aspect ratio when using a camera. This will also improve viewport rendering performance.

Using Render Region to speed up viewport rendering