This page provides details on using V-Ray's Resumable Rendering feature.
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Resumable renders are possible with both Bucket and Progressive Image Sampler types.
With Bucket rendering, an additional .vrimg is written, storing the data of the completed buckets. When resuming the render, V-Ray reads the .vrimg file to determine which buckets still need to be rendered and continues to calculate what is left to complete the image. Another great ability of this feature is that the Light Cache data is saved within the partial image file so that the light cache does not need to be recalculated when the render resumes.
When rendering with the Progressive image sampler, the state of the render is saved to an additional resumable .vrprog file, in a similar way to the .vrimg for Bucket rendering. Setting Autosave Interval (min) from the Image File Output rollout of the Render Settings Common tab (to anything higher than 0) is useful so V-Ray can write out the .vrprog files during rendering, in case the process is unintentionally stopped. However, setting the Autosave Interval (min) value too low (below a couple of minutes for example) may slow the render process.
If V-Ray finds a .vrprog file or a partially completed .vrimg file for the current frame, the rendering resumes from where it left off. If not, V-Ray starts a new render and a resumable file is then saved.
Note that Distributed rendering is also compatible with Resumable rendering. |
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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.
The passes calculate for a Progressive render or the buckets begin to drop for a Bucket render. The render can be stopped at any point in time and V-Ray will be able to use the .vrimg or .vrprog files to resume the render later.
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.
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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