This page provides information on using the V-Ray Frame Buffer for post-production of EXR images rendered in Chaos Cloud.

 

Overview


The V-Ray Frame Buffer can be used to apply post-production color corrections to EXR images rendered in Chaos Cloud. Because EXR is a raw image format, corrections cannot be written to the EXR file and have to be loaded separately. The image can then be saved again in the format of your choice.

 

 

Generating Different Types of Images with VFB


Chaos Cloud supports all output image formats on the 3D host app, except for Deep EXR, Tile EXR, TIFF, and TGA. If you need an image output in one of the unsupported formats, you can do the following:

  1. Generate your output in EXR or VRIMG format.
  2. Open the EXR / VRIMG files in the VFB on the host app and you can save it with the Save Current Channel button in the output you need.

 

 

Applying Color Corrections to EXR Images Rendered in Chaos Cloud


By default, Chaos Cloud generates an EXR and JPG versions of render jobs submitted to Chaos Cloud unless another format is set within the settings of the 3D editing platform used. The EXR image can then be loaded within the VFB to apply color corrections manually or using a saved preset.

 

Manual


To apply corrections manually, you first have to load the EXR image within the VFB. This is done using the Load image () button from the VFB's UI. The color corrections panel can then be exposed using the Show corrections control panel () button.

 

 

 You can use the color corrections panel that appears on the right to modify the image as you wish.

 

 

Once ready, you can save the processed image in any desired image format using the Save current channel () button on the VFB.

 

 

Presets


Color corrections can also be saved and applied as a preset.

  • For V-Ray 3.6 for Rhino, SketchUp, and Revit any color corrections are exported to a .vccglb preset file, contained in the render output archive, which you can download from Chaos Cloud.
  • For V-Ray Next for Maya and 3ds Max, color corrections are written directly to the .vrscene file and rendered on the cloud.

Since the EXR is a raw image format, no corrections will be written to it directly in both V-Ray 3.6 and Next. If you want to store your color corrections when using V-Ray Next, it is recommended that you save them separately when the render output is set to EXR.


To save a color corrections preset, left-click on the Globals... button on the corrections control panel, and select Save. To load a saved preset, select Load.

 

 

Separate color corrections can also be saved and loaded using the buttons. Once a preset is applied, you can use the Save current channel () button to save the image in the format of your choice.

For more detailed information on color corrections with the VFB, see the Color Correction pages for the respective platform (for example, V-Ray for 3ds Max). 

 

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