This page provides a tutorial on rendering large images with V-Ray.



Rendering very large images can be memory intensive as very large resolutions require more memory be added to the scene's own memory needs. This tutorial explains how to set up V-Ray to render very large images directly to disk, optimizing memory efficiency. By writing the rendering image file directly to disk, the memory buffer is disabled, saving on overall memory use. This is very advantageous for machines with limited memory.


The Progressive sampler type is not supported for rendering out large images in this way.


Setting Up to Render Large Images

1. With the Render output selected,  set the desired resolution of the image.

2.  In the V-Ray Main settings panel, switch the image sampler Type to Adaptive.


3. Render the image by going to V-Ray > Render with V-Ray, and ensure that Choose output image is checked. Select any Render Pass Group, if any, if you wish to render it.


The same approach is also applicable to the Render animation with V-Ray and Render with V-Ray Standalone options, as long as the output format is set to tiled EXR.

Optional stepThe default image format to be used when rendering with V-Ray can be set from System > Preferences > Rendering > V-Ray Renderer > V-Ray Production Rendering > Default image format. Setting the default to tiled 16 or 32-bit EXR will automatically choose the format for rendering large resolutions with preview only. In this case, you can skip step 4 of this tutorial.

4. When prompted for the file type and location, set the file type to OpenEXR Tiled Half 16-bit or Float 32-bit. Note that this only works with tiled EXR files and that during the render only a preview of the image will be displayed to optimize memory usage.


  • Due to increasing the resolution of the rendered image, you may find that the render settings may need to be revised to keep the render noise free due to the large size.
  • If you plan on denoising the rendered image, it is recommended to set the Denoiser mode to Only generate render elements in the Render Settings > Main > Denoiser post-process > mode and use the standalone denoiser tool.
  • OpenEXR Tiled file formats are not supported by Chaos Cloud.

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