Unreal Engine 4 Emissive from VXGI

Emissive? Lightspeed? We’re in a hurry! Time is money! Quick, rush-rush, faster! Not done yet? Get going already! But what if we run into an obstacle? Lets say a scene we don’t fancy that much? Unavoidable at times. Still, we can either dig in deep or decide to get rid of it as fast as possible.

It just so happens I came across such a scene myself recently. A while ago, Evermotion published a whole bunch of ready-made examples for Unreal Engine 4. Now I’ve come to know Evermotion’ example scenes as kind of a mixed bag. Usually there’s some good, some mediocre and some bad, all nicely packed together. This Unreal Engine bundle was no exception. You can see they’ve tried, but ultimately it all feels kinda uninspired. If there’s a theme or a philosophy to these scenes (other than selling stuff), please do enlighten me cause I couldn’t find it. Right, with that small rant out of the way, what are we supposed to do with examples like the above? Not much of course. We can extract some assets and that’s pretty much it. Or is it? Hmm. I suppose we could use it for a quick demo on how to get rid of Architectural scenes you don’t particularly like yourself the quick and easy/dirty way 🙂

Enter VXGI at Lightspeed

If you’re not too picky and you won’t end up with a headache over certain limitations, this might be a really nice way of ditching whilst cashing. Ok, we have our content. Now the lighting right? This can take ages. Not this time! We just wrap things in a Skysphere, put a emissive material on it, enable VXGI and voilà, we’re done. Really? Well, you can still tweak some settings and find cool camera angles but yeah, in essence we’re done. No direct light, no Skylight, nothing. Just VXGI doing its magic with some simple emittance voxels. Think of it as a Dome Light with benefits. You won’t win the next CG award but hey, at least you saved some precious time to work on that project you do enjoy!

The good and the bad

  • Ultra quick method for lighting your scene
  • Minimalistic yet robust base lighting
  • Ambient light only
  • Restricted look for materials

VXGI with only emissive (ON/OFF)


Examples and settings:

No idea what the above was about?

Just ask away in the comment section below and I’ll try to answer to the best of my abilities (which are very limited).


  1. Francisco Cruz 13/01/2017 at 20:54 - Reply

    Brute force in real time! Jezzz. In other hand. I like to use direct light in some scenes to produce indoors shadows of light coming from the sun. Do you think that using both sources at the same time will impact positive or negatively in the lightning?

  2. alex 20/06/2016 at 15:28 - Reply

    I am a complete newbie to Unreal. Where exactly is the VXGI inside of Unreal? Is that a addon that I need to install?

  3. Stepan 04/04/2016 at 11:08 - Reply

    It’s awesome. Sorry for maybe stupid question, i’m just beginner, but how to put emissive material on bp skysphere? and at this scene is no direct light at all?

    • Byzantos 3D 04/04/2016 at 11:12 - Reply

      Hi Stepan, No direct light at all 🙂 You probably need to experiment in your Post Process Volume with good exposure settings (and turn down bloom so you don’t get a pixel blowup) but you need these things in every scene. For the Skysphere, unless you absolutely need the blueprint, you can just remove it and change it for the staticmesh (it’s referenced in the blueprint), Might make things easier I hope?

      • Stepan 04/04/2016 at 12:46 - Reply

        Yes, clear! and thanks for your cool blog!

  4. Gilson Antunes Rodrigues 02/04/2016 at 16:31 - Reply

    Interesting Aaron !! I like the image 5 and 6, it seems that the light is coming in through the windows. The image 2 and 3 do not seem external light.

    What happens if you apply this stuff in the window panes? Is this possible? No Skysphere.

    Thanks for reporting 🙂

    • Byzantos 3D 02/04/2016 at 16:36 - Reply

      Hiya Gilson, Yes all light is coming through the windows only (from the Skysphere) because those are the only options for the light to get into the interior. But yes, you could also do this with simple planes in front of the windows (but it would be a bit slower to place manually, hence I made demo with just simple and quick sphere :-))

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