Question Optimizing Real-time lighting in mobile (URP)

Hi,

I have a set-up with a first-person view character + a real-time light simulating a flashlight with a cookie (with no shadows)

I noticed that the game frame rate drops noticeably on mobile. Apparently, due to lights calculations:



Are there any particular tips to optimize this?

 

Unity's builtin shaders, even for URP which is meant to be a 'performance-first' pipeline, often need a lot of work to get them to a shippable state on mobile. How you optimize is up to you, but first thing would be to check what shaders you're using across all materials in your scene, check simple things like what resolution the game is natively rendering at, and you might find an easy solution.

 

I don't use URP, just built in but in many tests with my game that uses a real time sky and a flashlight on mobile, the thing that affects performance the most is resolution.

Not sure if the same would apply using URP but I think it will.

 

Thanks @GoGoGadget and @derkoi for your answers, But I don't really understand what do you mean by resolution? Resolution of what? resolution of textures used in the environment?

Where can I find this parameter you're talking about.

 

Display resolution. That's what the rendering resolution is.

 

Activate Dynamic Resolution and adjust the resolution scaling with

ScalableBufferManager.heightScaleFactor

and

ScalableBufferManager.widthScaleFactor

.

You could also set the base resolution using Screen.SetResolution to 80%. No phone needs to be rendering at native res. It's too many pixels.

SetResolution to 50% will improve the frame rate more than ScaleableBufferManager to 50%, but it will affect the UI resolution also.

 

I disagree with this, but I do agree that reducing resolution is the easiest way to gain performance when using Unity's features on mobile.