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This page provides details on using V-Ray's Resumable Rendering feature.

Overview

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Column width 55% Resumable rendering is the ability to have incomplete renders resume where they left off from the previous session. The rendering may have stopped due to any number of reasons such as a power failure or having the job bumped off a machine or a render farm, or perhaps you stopped the render manually and want to start from where you left off. Resumable rendering uses sidecar files for tracking checkpoints. For Bucket sampling, it uses a .vrimg file, and for Progressive sampling, it uses a .vrprog file. For details on the Resumable Rendering settings, please see the V-Ray Common tab page under the Render Settings window. A video tutorial is also available here. Want to follow along but don’t have a license? UI Button color blue newWindow true icon download title Download Free Trial url https://www.chaos.com/free-trial?utm_campaign=docs-tutorials&utm_medium=website&utm_source=docs.chaos.com Column width 5%   Column width 40%

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How it works

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Resumable renders are possible with both Bucket and Progressive Image Sampler types.

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• Go to Render Settings window > Common tab > Image File Output rollout and enable the Resumable rendering feature. If using the Progessive sampler, it is highly recommended to enable the Autosave interval (min) by setting it higher than 0. This saves partial files that can be used and helps prevent losing the render progress if Maya crashes and a .vrprog file hasn't been created/updated.
  When using the Bucket sampler, the Autosave interval (min) option isn't available.

• Disable the Don't save image (ignored for batch and Cloud) option from Render Settings > Common tab > Image File Output.

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If you forget to disabled the option, you will receive an error when you start a resumable render. However, when rendering animations in batch mode, the Don't save image (ignored for batch and Cloud) option doesn't affect the resumable rendering.

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• Select an Image Format again in the Image File Output rollout. Any of the possible image outputs can be used for this step.

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If you stop the render and want to resume it on another computer or location, make sure to copy the .vrimg or .vrprog file with the rest of your project so V-Ray can pick up where the render left off. It is not recommended to change Render Settings between stopping and resuming renders. The only settings that are acceptable to change in between stopping and resuming a render are Progressive sampling parameters (Min. subdivs, Max. subdivs, Render time, Noise threshold). Changing settings like the output resolution and render elements causes an error and the render does not resume.

Animations

• Go to the Render Settings window > Common tab > Image File Output rollout and enable the Resumable rendering feature.

• Set the frame range, i.e. Start Frame and End Frame from the Render Settings window > Common tab > Animation rollout.

• Again in the Image File Output rollout, set the Autosave interval (min) if you want. Also if using the Progressive sampler, set the Max. render time to a preferable value depending on how much time you have and the level of quality you need. The Max. render time is located in the Render Settings window > V-Ray tab > Animation rollout.

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• Start rendering.

Just like with still images, make sure to copy the .vrimg or .vrprog file with the rest of your project when you stop a render and resume it on another computer or location. Thus, V-Ray can pick up where the render left off. It is not recommended to change Render Settings between stopping and resuming renders. The only settings that are acceptable to change in between stopping and resuming a render are Progressive sampling parameters (Min. subdivs, Max. subdivs, Render time, Noise threshold). Changing settings like the output resolution and render elements causes an error and the render does not resume.

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