Change the fade distance of lights with fall-off
Change the rate at which light fades in lightmaps using a script.
Read time 2 minutesLast updated a month ago
In the real world, light fades over distance, and dim lights have a lower range than bright lights. The term "fall-off" refers to the rate at which light fades. Alongside Unity’s default fall-off lighting behaviour, you can also use custom fall-off settings.
The light baker provides custom fall-off presets, which you can implement via script. See the image below the table for a visual representation of how these work, and the code sample below the image for an example of how to use this functionality.
Refer to for more information.
FalloffType
An example of the visual effect of each custom fall-off preset
Example
Note
The code example below only works with the light baker when you use Baked or Mixed lights. To use the code example with realtime lights, use Enlighten Realtime Global Illumination.
using System.Collections;using System.Collections.Generic;using UnityEngine;using UnityEngine.Experimental.GlobalIllumination;using UnityEngine.SceneManagement;[ExecuteInEditMode]public class ExtractFalloff : MonoBehaviour{ public void OnEnable() { Lightmapping.RequestLightsDelegate testDel = (Light[] requests, Unity.Collections.NativeArray<LightDataGI> lightsOutput) => { DirectionalLight dLight = new DirectionalLight(); PointLight point = new PointLight(); SpotLight spot = new SpotLight(); RectangleLight rect = new RectangleLight(); DiscLight disc = new DiscLight(); Cookie cookie = new Cookie(); LightDataGI ld = new LightDataGI(); for (int i = 0; i < requests.Length; i++) { Light l = requests[i]; switch (l.type) { case UnityEngine.LightType.Directional: LightmapperUtils.Extract(l, ref dLight); LightmapperUtils.Extract(l, out cookie); ld.Init(ref dLight, ref cookie); break; case UnityEngine.LightType.Point: LightmapperUtils.Extract(l, ref point); LightmapperUtils.Extract(l, out cookie); ld.Init(ref point, ref cookie); break; case UnityEngine.LightType.Spot: LightmapperUtils.Extract(l, ref spot); LightmapperUtils.Extract(l, out cookie); ld.Init(ref spot, ref cookie); break; case UnityEngine.LightType.Rectangle: LightmapperUtils.Extract(l, ref rect); LightmapperUtils.Extract(l, out cookie); ld.Init(ref rect, ref cookie); break; case UnityEngine.LightType.Disc: LightmapperUtils.Extract(l, ref disc); LightmapperUtils.Extract(l, out cookie); ld.Init(ref disc, ref cookie); break; default: ld.InitNoBake(l.GetEntityId()); break; } if (l.cookie != null) { ld.cookieTextureEntityId = l.cookie.GetEntityId(); } else { ld.cookieTextureEntityId = EntityId.None; } ld.falloff = FalloffType.InverseSquared; lightsOutput[i] = ld; } }; Lightmapping.SetDelegate(testDel); } void OnDisable() { Lightmapping.ResetDelegate(); }}
Note
All code in the example above is necessary for the custom falloff to work; however, you can change in the line to use any of the presets.
InverseSquaredld.falloff = FalloffType.InverseSquared;