Question There is any way to cache light at realtime?

Hi,
I created shadows at realtime with ondemand shadows feature https://docs.unity3d.com/Packages/c...h-definition@16.0/manual/Shadows-in-HDRP.html but i wonder if there is also any way to cache light. I want to open a door, and light from corridor enter the room, i create an ondemand shadow with RequestShadowMapRendering but still i must leave the light enabled, which is still expensive. I would like to know if there is a way so that light just rendered lights and shadows once and those remain cached and in that way i could disable the light once is cached, there is any way to do this?

 

So i would need to bake lightmaps, save them in a different folder and make another bake with different lighting. And then how can i swap them?

 

Like this

But if you want to properly light interiors and outdoors and have this interactive, might as well use realtime GI solution from asset store.

Also, check in profiler if your realtime light is actually expensive. It's usually not in deferred, it's the shadows that are expensive.

 

Agreed - it is unlikely that the shadow-less lights you are using is expensive in deferred.

If you have many lights visible with shadows, it can also become a problem from a memory point of view (see the punctual lights atlas stuff).

For performance, you can do mixed cached shadows to bake them but still have them real-time for moving objects. But you should also consider switching to point lights where possible. For example if you have a downward pointing street lamp, probably no need for it to be omni, especially with shadows enabled this will eat resources.

 

I don't want to use realtime GI, i just want to update it once and then remove light. It is expensive cause my frame drops when i use some lights without shadows. It is expensive for me cause cause frames drop from 90 in VR HDRP to 45 with vsync. I use deferred.