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Lets make Lightmass EPIC (and understandable)

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  • replied
    [MENTION=28094]asmithey[/MENTION] You can find the Lightmass portal by searching at "Search Classes" or rolling down in "All Classes" category.

    Somebody can help me... my lightmass portal does not make any difference at the scene.

    Lightmass settings:

    Static Lighting Leve Scale: 0.3
    Bounces: 50
    Indirect Quality: 3.0
    Smoothness: 2.0

    Click image for larger version

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    Attached Files
    Last edited by Carlos David; 06-09-2016, 10:45 AM.

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  • replied
    Can someone please tell me how to or where to find lightmass portals? I thought maybe under volumes, but I do not see anything there.

    I am using 4.12.1

    Thanks

    EDIT: I found it.
    Last edited by asmithey; 06-07-2016, 07:26 PM.

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  • replied
    IndirectIrradiancePhotonDensity
    IndirectPhotonSearchDistance

    4.12 change this setting all scene distorted.help me please

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  • replied
    Originally posted by melvixo View Post
    Really interesting posts here. What about vxgi? Anyone tried it out? I have been considering it for archviz but my laptop has a Geoforce GTX 780m. Will vxgi still be compatible with the card or there will be issues with it or some features are missing? I don't mind low frame rates since I can render it out as image sequences rather than record it. Or is there an advantage to using Lightmass over realtime GI?
    Yes there are many advantages to lightmass.

    Looks much better and alot less taxing on your system.

    Leave a comment:


  • replied
    Really interesting posts here. What about vxgi? Anyone tried it out? I have been considering it for archviz but my laptop has a Geoforce GTX 780m. Will vxgi still be compatible with the card or there will be issues with it or some features are missing? I don't mind low frame rates since I can render it out as image sequences rather than record it. Or is there an advantage to using Lightmass over realtime GI?

    Leave a comment:


  • replied
    Ini is for experienced users who want maximum control on every settings or access settings that are not in the editor interface. it's not mandatory at all to mess with it.

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  • replied
    so guys.. i still dont get it. can somebody summarize please? we are using portals which came with 4.11 and anything addition to that in .ini file or not? everbody takes different approaches i guess.. i just dont want to overkill and weeks of rendering lol.. what is the "enough" settings for quality now?

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  • replied
    Originally posted by Raghu View Post
    Nice thought Sythen. I was also thinking something similar in approach but different in sense of its implication like - It would be nice if we can see the Photon Gathering/Importance Sampling while Light Build (Like Vray Irradiance Samples or any other common renderer out in the market), that will give tremendous visual information for actual working of Lightmass and will eventually help in understanding and manipulating settings in Baselightmass somewhat easy. 4.11 is far more better then any previous Engine versions but still I feel like it lack basic tools for refining or finding bugs while light building, especially when it comes to tweaking Lightmass settings (Lightmass settings available in Engine UI are painfully simple). As I have reiterated many times before that simple settings of Lightmass are perfect for quick setup but may become major hindrance when it comes to adjusting or manipulating it for realistic light build, Ultimately there is no other option but to jump in BaseLightmass for Final Built. Portals made a major impact for small scenes now, simply putting it solves 90% of the bugs but for complex scenes we still require some kind of editing in BaseLightmass to get that super clean look.

    It would be nice if we can see some more features in Engine UI itself regarding Lightmass, More detailed settings related to Photon Density, Irradiance Samples, Irradiance Radius and so on with ample explanations in Engine Docs for Noobs like me and not only for hardcore programmers out there (I think Engine Help Documents need serious update regarding the Lightmass Settings and Portal help).

    Lighting Quality presets are really helpful but If we can get something similar for Lightmass settings also like - Expert Mode or Advanced Mode - Giving users enough settings to fully control the behavior and intricacies involved.
    My guess is that it will become a reality soon enough. Epic is realizing their engine has a lot of potential outside the gaming world and they are adjusting. Have you watched the Unreal Engine Enterprise twitch stream? They talk about that. I think lots of new solutions has been developped for the Mclaren car customizer and soon we'll see more and more improvement for architects, designers, etc! Exciting times!

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  • replied
    Originally posted by koola View Post
    The problem is also fixed with NumIndirectPhotonPathsScale value set to 3 (instead of 2) ... but if you move/scale the box the leak is back.
    Confirmed.

    only NumIndirectPhotonsScale=4 seems to solve this issue, even if the box is moved/scaled.
    Last edited by Ptyx; 05-17-2016, 01:47 PM.

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  • replied
    The problem is also fixed with NumIndirectPhotonPathsScale value set to 3 (instead of 2) ... but if you move/scale the box the leak is back.

    Leave a comment:


  • replied
    baselightmass.ini
    in prod quality settings :

    NumIndirectPhotonsScale=8 -> NumIndirectPhotonsScale=4 and the leak effect is gone (same value than the one for "high" settings)

    (then maybe the "NumImportanceSearchPhotonsScale" should be changed accordingly, from 3 back to 2 (same value than the one for "high" settings))

    Leave a comment:


  • replied
    If we play with "Cube" position (ie, moving it away from "Bloc", even slightly), or its rotation on Z axis, the "leak" effect tends to change and/or disappear.
    Could it be related to the increase in the amount/distance of Light that Bounces (better know as the Troutman Effect) in prod mode ?
    That could explain why it appears only with the production settings.

    Leave a comment:


  • replied
    Originally posted by koola View Post
    Thank for the test.

    This is really weird, I just see I don't have this problem with high/medium/preview setting, just with production setting.
    I confirm the leak in v 4.11.2, and only with production settings

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  • replied
    Thank for the test.

    This is really weird, I just see I don't have this problem with high/medium/preview setting, just with production setting.

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  • replied
    Originally posted by koola View Post
    Hi all !

    I found a case that I can't manage to fix :

    a simple room lit by a point light with a window and a cube on the outside.






    After baking, there is a huge light bounce between the outer wall and the cube :



    Here's the scene if someone want to take a look : https://www.dropbox.com/s/y93kx0a73u...s_Leak.7z?dl=0
    I Just rebuild the lighting on your level for testing and there are no light leaks what so ever, even I am not able to replicate the error.
    Attached Files
    Last edited by Raghu; 05-17-2016, 06:59 AM.

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