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light cache resolution question.

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  • light cache resolution question.

    If the light cache was calculated at say 640x480 but the the final rendering was 1280x960. Would using the lower res maps for higher res image give predictable result?

    Thanks

  • #2
    Light Cache is resolution independent - once calculated you can use it in every resolution.
    Here are two identical images with size 1000x563 - on the first one LC is precalculated on 10x6 resolution and the final render is 1000x563 - on the second LC is calculated with the same 1000x563 resolution.
    Click image for larger version

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ID:	847204Click image for larger version

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ID:	847205
    Svetlozar Draganov | Senior Manager 3D Support | contact us
    Chaos & Enscape & Cylindo are now one!

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    • #3
      Many thanks for the information Svetlozar I never knew that, thats going to save me plenty of time!! If only I realized this a few years ago...

      Cheers

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      • #4
        Originally posted by svetlozar_draganov View Post
        Light Cache is resolution independent - once calculated you can use it in every resolution.
        Here are two identical images with size 1000x563 - on the first one LC is precalculated on 10x6 resolution and the final render is 1000x563 - on the second LC is calculated with the same 1000x563 resolution.
        [ATTACH=CONFIG]13570[/ATTACH][ATTACH=CONFIG]13571[/ATTACH]
        So we can bake the LC with a little resolution (10x6) and re-use the map for the final resolution.
        But, the question is : bake the LC with a little resolution will be more faster than bake the LC on a final resolution ? or we do not have benefice to do this ?
        www.deex.info

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        • #5
          There is no differences in the render-time between LC calculated on different resolutions , otherwise it won't be resolution independent
          According to my tests there is a very very small difference when using different resolution - it is not noticeable in the render but it is there.

          10x6 resolution = 269kb LC map
          1000x563 = 269kb LC
          10000x5630 = 281kb

          The fired rays between the second and the third are also slightly different - but I haven't found any differences in the final render.
          Svetlozar Draganov | Senior Manager 3D Support | contact us
          Chaos & Enscape & Cylindo are now one!

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          • #6
            OK thanks for that I naturally assumed it would be much quicker to calculate smaller maps, but as you say that's not the case, I don't feel so daft after all!

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            • #7
              Yes this is normal because everything works much faster on smaller resolutions - but it is because almost everything is resolution dependent, which is not the case with LC.
              It would be fantastic if there is a way to calculate everything on low-res and then just do a final render on high-res with the same quality - but unfortunately there is no such thing as free lunch.
              We have to pay either with the quality or with the render-time.
              Svetlozar Draganov | Senior Manager 3D Support | contact us
              Chaos & Enscape & Cylindo are now one!

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