Load Light Probes At Runtime

Unity Engine
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1

Hello, i am trying to load Lightmaps and Light Probes from a prefabs at runtime.

I already load lightmaps correctly at Runtime, but i am struggling with light probes, this is what i get from my studies.

  1. Lightprobes cannot be instantiated, the game scene must already have a set of lightprobes in the scene and the lightmapdata already generated.

  2. Lightprobes can be loaded correctly when the editor is not in playmode, but if i load at runtime the only thing that change is the position of every probe. If i change the harmonics value seems to have no effect.

private void CalculateLightProbes(PrefabLightmapData[] lightmapDatas, string configurationId)
{
        var bakedProbes = LightProbes.GetSharedLightProbesForScene(SceneManager.GetActiveScene());

        var harmonics = new List<SphericalHarmonicsL2>();
        var positions = new List<Vector3>();

        foreach (var lmData in lightmapDatas)
        {
            LightmapConfiguration config = lmData.GetLightmapConfiguration(configurationId);

            harmonics.AddRange(config.ProbeData.SphericalHarmonics);
            positions.AddRange(config.ProbeData.Positions);
        }

        for (int i = harmonics.Count; i < bakedProbes.bakedProbes.Length; i++)
        {
            harmonics.Add(bakedProbes.bakedProbes[i]);
        }

        for (int i = positions.Count; i < bakedProbes.positions.Length; i++)
        {
            positions.Add(bakedProbes.positions[i]);
        }

        LightmapSettings.lightProbes.bakedProbes = harmonics.ToArray();
        LightmapSettings.lightProbes.SetPositionsSelf(positions.ToArray(), false);
        
        LightProbes.tetrahedralizationCompleted -= OnTetrahedralizeCompleted;
        LightProbes.tetrahedralizationCompleted += OnTetrahedralizeCompleted;

        LightProbes.Tetrahedralize();
}

private void OnTetrahedralizeCompleted()
{
        Debug.Log("Tetrahedralization completed!");
        
        /*int probeCount = LightmapSettings.lightProbes.count;
        for (int i = 0; i < probeCount; i++)
        {
            // Clear the probe and add ambient light
            LightmapSettings.lightProbes.bakedProbes[i].Clear();
            LightmapSettings.lightProbes.bakedProbes[i].AddAmbientLight(Color.white);
            
            // Add the contribution of directional and point lights
            foreach (Light light in FindObjectsByType<Light>(FindObjectsInactive.Exclude,FindObjectsSortMode.None))
            {
                if (light.type == LightType.Directional)
                {
                    LightmapSettings.lightProbes.bakedProbes[i].AddDirectionalLight(-light.transform.forward, light.color, light.intensity);
                }
                else if (light.type == LightType.Point)
                {
                    AddPointLight(LightmapSettings.lightProbes.positions[i], light, ref LightmapSettings.lightProbes.bakedProbes[i]);
                }
            }
        }*/

        var probes = LightmapSettings.lightProbes;

        _occlusionProbes = new Vector4[probes.count];
        LightProbes.CalculateInterpolatedLightAndOcclusionProbes(
            probes.positions,
            probes.bakedProbes,
            _occlusionProbes);

        foreach (var renderer in FindObjectsByType<Renderer>(FindObjectsInactive.Exclude, FindObjectsSortMode.None))
        {
            if (renderer.lightProbeUsage == LightProbeUsage.Off) continue;

            renderer.SetPropertyBlock(CreatePropertyBlock(probes.bakedProbes));
            renderer.UpdateGIMaterials();
        }
        
        OnLightmapLoaded?.Invoke();
 }

PrefabLightmapData is a structure that stores baked Lightmaps and Light Probes for a prefab. I read and apply this data at runtime when placing rooms in a procedural dungeon.

2

Any suggestions ?

3

I was going to attempt a similar approach myself. Did you ever get anywhere with this?