Moving emissive texture and GI (hdrp)

Hello,

I'm trying to get a moving emissive texture to emit light on a baked floor (static). I choose "Emission > Global Illumitation > realtime" in the Material using my HDRP unlit shader (i didn't quite figure out when baked is for).




When i tweak the offset in the inspector, i see the emitted light moving on the ground, but when the animation is shader based, it doesn't :



Here i use a simple time sin node of the x offset of the uv.

I looks like Unity is updated someting on the GI in editor when there is a inspector change and is not doing it continuously at runtime.

How can one, achieve this kind of moving light from a texture ? Thank you !

 

For people looking for a solution, Nomcycle mentioned this on Discord :

https://docs.unity3d.com/ScriptReference/RendererExtensions.UpdateGIMaterials.html

I guess it can be dangerously expensive but i did that :

Code (CSharp):

1. using System.Collections.Generic;
2. using UnityEngine;
3.  
4. [ExecuteInEditMode]
5. public class EmissiveUpdater : MonoBehaviour
6. {
7.     public List<Renderer> renderers = new List<Renderer>();
8.  
9.     private void Update()
10.     {
11.         foreach (var renderer in renderers) {
12.             renderer.UpdateGIMaterials();
13.         }
14.     }
15. }