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lighting effect in ue4

melviso
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melviso polycounter lvl 10
How can this lighting shaft  be created in ue4?

Image result for house lights

I am aware you can do this with direction light but is this possible for a emissive material? and in this case it would be a point or spotlight. I have some lights embedded in the ceiling and they should have this volumetric effect. Or is this best done using mesh with alpha maps always facing the camera?

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  • leleuxart
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    leleuxart polycounter lvl 10
    If you're referring to the lens flare, then there is no specific way to do them right now since UE4 doesn't have a standalone Lens Flare editor anymore. Common practice is to use a particle sprite that is camera facing, similar to what they did in the Infiltrator demo and in Unreal Tournament levels. There is also a Lens Flare blueprint/material setup on the Marketplace, but it's a bit tricky to use and you can only see it in game due to them being UI. That might not be an option for you. 
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  • melviso
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    melviso polycounter lvl 10
    Yes, I would need it to show in the viewport, as I would be rendering out an animation using ue4 sequencer. By particle sprite, you mean a mesh with alpha maps? How would I make it always face the camera though?
    I found this:
    https://www.youtube.com/watch?v=ciqcUlqZgcs
    Could this be used to fake the effect? Here a cylinder is used but for what I am trying to achieve, a plane would be sufficient?


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  • Obscura
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    Obscura grand marshal polycounter
    What you are showing there in the video, is more like a volumetric light effect, that happens when the air has a lot of dust or some other particles - dense fog for example... What you are looking for, is a lens effect.

    To make a plane facing the camera, you can do this:

    https://docs.unrealengine.com/latest/INT/Resources/Showcases/Stylized/Materials/index.html

    To make it changing shape, fading out etc, you can use the angle between the camera and the mesh, or you could make a soft mask using the screen coordinates.
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  • melviso
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    melviso polycounter lvl 10
    Thanks Obscura. Ue4 is really sort of technical to get certain features that aren't part of the engine mainstream. Coming from archviz with offline renderers, its a bit challenging but makes it interesting. In a production setting, might be a bit of a hassle but we learn everyday and get better.
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  • John Baxter
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    John Baxter polycounter lvl 7
    It'd be nice to be able to get this effect on specular reflections. I wish Epic would implement a lens flare/bloom editor. :/
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  • musashidan
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    musashidan high dynamic range
    If you look in the Content Examples>Level Design map>there is a 'Godray' volumetric BP setup that might be of use to pick apart.
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  • melviso
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    melviso polycounter lvl 10
    musashidan said:
    If you look in the Content Examples>Level Design map>there is a 'Godray' volumetric BP setup that might be of use to pick apart.
    Will check it out, thanks mate
    John Baxter said:
    It'd be nice to be able to get this effect on specular reflections. I wish Epic would implement a lens flare/bloom editor. :/
    Yeah but they are doing a lot to make the engine better. It almost a good choice for archviz. Hopefully soon, this would be added. Can't imagine what will come with ue5.
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  • John Baxter
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    John Baxter polycounter lvl 7
    If anyone is watching the GDC livestream they revealed this feature called "FFT Bloom." Sounds like they're going to implement it at some point in the next year.
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  • melviso
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    melviso polycounter lvl 10
    John Baxter said:
    If anyone is watching the GDC livestream they revealed this feature called "FFT Bloom." Sounds like they're going to implement it at some point in the next year.
    That's good news.
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