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Proper lighting with moveable directional light?

Source built 4.6.1

When I put a dynamic directional light it tends to ignore any objects that must cast a shadow on or block the light on a object next to it.

As an example I made a room with four static meshes as walls with one of the four walls having a window parallel to the direction of directional light. As such I expected the light to only come in by the window , but the whole wall opposite to the window wall is lit up like there is nothing around it. same happens for other meshes, it behaves as if there is directional light source for each mesh and not how typical sunlight does.

Is this supposed to be like that?

Not to mention the there is no Dynamic GI and I can't enable it using console variables either. So only the part of the mesh facing the directional light is lit and other side is completely pitch black there is absolutely 0 light bounce!

I heard something called Light propagation volume but so far I cannot enable it reading and trying through several wiki articles (most of them are outdated) lets hope GI gets mature fast .

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asked Feb 22 '15 at 06:41 PM in Rendering

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Commander Shepard
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Hey CommanderShepard,

Take a look at our newly created and continually being updated Wiki troubleshooting and tips guide: https://wiki.unrealengine.com/LightingTroubleshootingGuide

Depending on how you've set your meshes up, if they are single sided or have some depth will depend on how to proceed.

The Dynamic Light link on there is still being updated. I've not had a chance to finalize and get it up on the Wiki yet, but you can check out the information I've got so far (with screenshot examples): https://www.dropbox.com/s/1710fk8lm5votji/DynamicShadowBleed%20%281%29.pdf?dl=0

This should help you get better control over your Dynamic light's cascaded shadows.

This is supposed to be like this. There are settings that need to be adjusted to get things setup correctly.

There is no Production-Ready dynamic GI at the moment. The only thing we have documentation on at the moment is Light Propagation Volumes (LPV). There are known issues with it as it's not being actively developed at the moment. Lots of light leaking between interior and exterior scenes. This page also has the instructions to enable this feature. It requires editing the consolevariables.ini in the engine folder.

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answered Feb 23 '15 at 06:37 PM

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Tim Hobson ♦♦ STAFF
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