Dynamic Pointlight Performance
I experience really poor performance with dynamic pointlights. I have seen this in several projects/ue4 versions especially with foliage, but also with other kinds of geometry. Literally when theres a place with like 10 trees and I add a dynamic pointlight with shadows enabled the FPS drop from about 90 to 15. It seems to be less expensive with other kinds of geometry, but still drains huge amounts of performance.
I have read up several topics in that regards over the time e.g. https://answers.unrealengine.com/questions/184262/47-adding-point-light-causes-massive-fps-drop.html but without a solution. Testing comparable scenes/setups with other Engines yield much better framerates. They are often more performant by a factor of 20 and higher. So there definitely must be something wrong on Unreal's side.
Theres also a huge drop when The Camera (editor or pie) moves into the pointlights radius - even when looking away from the light and not having any lit geometry in the view port.
I never had performance drops like this. Shadowcasting from dynamic point light is indeed expensive on masked geometry, but 1 light would never cause such issues. How large is the radius of your light?
answered Aug 20 '16 at 10:03 PM
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