Why does Redshift's lighting look different between my editing machine and TeamRender?

Steve
Steve
  • Updated

Differences between Redshift lighting renders typically occur when there are discrepancies between how two machines calculate Global Illumination (GI). 

It can be solved by caching your Global Illumination before starting a render.

These render discrepancies can cause blown out lighting, lighting that is too dim, and anything in between.

It is typically noticeable with bucket rendering on a still image (i.e. where there will be a "tiled" look) because the lighting rendered by one machine's buckets differs from the lighting of another machine, creating a strange patchwork look.

How to cache your Global Illumination:

  1. In Redshift, head into Render Settings > Redshift > enable the Advanced tab > Global Illumination
  2. Expand the Irradiance Point Cloud and, under Mode, select Rebuild (Prepass only).
    • This forces Redshift to render only the Global Illumination prepass (instead of the whole image).
  3. Now select Render > Render to Picture Viewer
    • This renderr out the whole project's GI prepass.
    • Ensure you have Render Settings set to render the whole animation (if applicable)
    • Make sure you are doing a regular Render to Picture Viewer and not a Team Render to Picture Viewer, as the GI prepass needs to be rendered all on one machine.
  4. A "tex" folder has now been saved in your project folder with "projectname.gi" files for each frame.
    • This file is your GI prepass.
    • If you did not use File > Save Project With Assets operation to save your project file to its own project folder, the default location of the tex folder is in your Cinema 4D Preferences, found under the Preferences window in Cinema 4D > Preferences Folder... 
      • A tex folder created in the Cinema 4D preferences folder is shared by all projects.
      • Building new GI prepasses for projects not saved with assets in their own folder will overwrite this folder.
  5. Go back to your Redshift Render Settings
  6. Under Global Illumination > Irradiance Point Cloud, change the Mode to Load
    • Redshift will now load a GI prepass file or files (instead of calculating the GI) at render time, which both saves time and uses GI information from only one machine, preventing discrepancies.
  7. You can now perform a Render > Team Render to Picture Viewer, or you can start your render job from Team Render Server, and the GI will render consistently between all of your machines, without any discrepancies between Redshift RenderView/IPR/Test Renders.

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