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This page provides a tutorial on using V-Ray's Render Mask feature.

Overview

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The Render Mask makes it easy to choose just a part of the image you'd like to re-render. It's more accurate and offers more control than Render Region. It can be found in the Image Sampler (Antialiasing) rollout.

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Workflow

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Here's our base render:

 

 

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If we look at the Alpha Channel, it is updated as well.

 

 

Notes

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  • When rendering animation with Render Mask, the previous render can be cleared by going to the Render Setup window > Settings > System rollout and setting the Previous parameter to €œClear€.
  • When using VRayPhysicalCamera and Auto Exposure enabled, note the following: after the initial render is done, use the Transfer to camera button from the Render Setup. Then disable the Auto Exposure. This way, the exposure is constant regardless of the region or object selection.