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1. Re: Changes to RectLight in UE5?

   

   

   Reply by zombie420 · Oct 2021 · Home› Unreal Engine

   @poopipe If I'm understanding it right, in 4.26 (with RTX) I'm seeing the light span evenly across the light source's parameters: In 5.0 (with lumen) I'm seeing light emit from the actor's origin: And testing with lumen, I'm only seeing emissives light up an area if the emissives are visible. Which is still cool, but…

2. Re: Changes to RectLight in UE5?

   

   Reply by ZacD · Oct 2021 · Home› Unreal Engine

   Also for lumen to work with offscreen emissives, you need to make sure all (most) of your meshes have distance fields enabled and built. There's still some issues if the emissive is too small. 

3. Re: Changes to RectLight in UE5?

   

   Reply by poopipe · Oct 2021 · Home› Unreal Engine

   in 4.25/4.26 they cast shadows from the origin in the same way. What happened before that I can't say, In ue5 with lumen you should be able to use an object with an emissive material for this sort of light 

4. Re: Changes to RectLight in UE5?

   

   Reply by poopipe · Oct 2021 · Home› Unreal Engine

   ive not been working with RTX on 4.26 so that might be it. you would probably get better results from lumen if you allow enough space for the light to bounce off the wall . I've not mucked around with it since the first ue5 preview but offscreen emissive objects contributed to bounce light perfectly fine in that - it's…