Lightmapping for runtime instantiated objects

Is there a way to use the lightmaps for runtime instantiated objects?

Before Unity5, baked lightmaps will also apply to the duplicated object, but in Unity 5, I was told that the lightmapping works completely differently. Once you click build lightmap is baked for entire scene, not separate objects, therefore if you duplicate an object in already baked scene, the lightmap will not be applied.

So something like endless runner type of games cannot use lightmapping anymore?

 

Thank you KEngelstoft, but I don't think light probes and reflection probes will work in this case.

The objects I want to instantiate aren't dynamic, they're static, that's why I was able to use the lightmapping.
I want to instantiate a piece of `ground` for a infinite runner type of game. There are many different pieces randomly instantiated as player runs through, and there are also curves and turns.
Because the ground is randomly selected at runtime, I can't just setup a scene in editor and bake for an entire scene, and for an infinite runner type of game, you won't know how far the player will get.

I received a suggestion to put every single piece of ground in a scene on its own and bake for each of them separately, and at runtime load them additively to the current scene and move it to the position I want. I'm not sure whether its going to work, I'll test and try it out. With more than 100 pieces of ground it's going to take a while...

 

Hello @KEngelstoft. We are having this same problem on our project. This was possible in Unity 4 and we were using this technique in our endless runner. But we've just upgraded to 5 and it is now broken. It looks like there is already a bug for this (issue 676606). But there isn't really any info on that issue so I am not sure.

Is there anyway to get this issue escalated, as we are planning to release in a couple months. The problem seems clear, the lightmapIndex and lightmapScaleOffset values don't seem to be saved to prefabs, or copied to a cloned object.

Thanks!

 

If it helps at all while you're waiting for an official fix, you can just cache the lightmapIndex and lightmapScaleOffset on a component next to your renderer and set them on the renderer during Awake or Enable. We were using this to swap lightmaps in Unity 4 and that portion seems to still work in Unity 5 (although if you're using any of the new GI stuff that may not transfer properly).

 

@KEngelstoft, Thanks, if there's any more info or progress updates about that issue, I'd be happy to hear them.

@mikamikem Yeah, I've thought about doing this, and if I need to I will. Just don't want to work on a temp fix, if an official fix is imminent.

 

Hello Guys any news on this one? We have exactly the same problem since our migration to Unity 5 all the cloned at runtime objects are losing their lightmaps. Since we are almost in July and the last message was in March i'm wondering if we should implements that fix or wait for a proper solution from Unity. Thx !

 

Any news? I have the same problem... Going to duplicate lightmap parameters when instantiating as a temporary solution, but it looks like a dirty hack...

 

Hello all. I would like to keep lightmaps when cloning objects (not even in runtime) baceuse I have a scene of +2000 objetcs that will be cloned 4 times to save memory (4 times less lightmap memory, and rendering time which is huge).
Looking forward to a sollution too.

 

Hello @Joachim_Ante , @KEngelstoft This is not a proper solution as I cannot fill all my 200 prefabs with lightmap offsets and indexes. Even this solution also not working properly.
Please let me know when can I expect good solution for this problem?

 

Anyone know if there's been progress on this? Still something that would be great to have.

 

Still waiting for this...

 

Still no with 5.6?

 

I am having the same problem described here. I need to create a road from instantiated chunks containing baked lightmaps, however the instantiated objects do not use the lightmaps of the prefab. Currently I am resolving it using the following code snipper:

Code (CSharp):

1. private void SetInstantiatedLightmap(GameObject obj, GameObject prefab)
2.     {
3.         var imr = obj.GetComponentsInChildren<MeshRenderer>().ToList();
4.         imr.Add(obj.GetComponent<MeshRenderer>());
5.         var pmr = prefab.GetComponentsInChildren<MeshRenderer>().ToList();
6.         pmr.Add(prefab.GetComponent<MeshRenderer>());
7.         if (imr != null && pmr != null && imr.Count == pmr.Count)
8.         {
9.             for (int i = 0; i < imr.Count; ++i)
10.             {
11.                 var renderer = imr[i].GetComponent<MeshRenderer>();
12.                 var prefabRenderer = pmr[i].GetComponent<MeshRenderer>();
13.                 if (renderer != null && prefabRenderer != null)
14.                 {
15.                     renderer.lightmapIndex = prefabRenderer.lightmapIndex;
16.                     renderer.lightmapScaleOffset = prefabRenderer.lightmapScaleOffset;
17.                     renderer.realtimeLightmapIndex = prefabRenderer.realtimeLightmapIndex;
18.                     renderer.realtimeLightmapScaleOffset = prefabRenderer.realtimeLightmapScaleOffset;
19.                 }
20.             }
21.         }
22.     }

Does anyone know if there is a better way?

 

Wow...
How about baking lightmap at runtime ? ( loading time ? )

 

Any news on this subject? i would like to set up lightmap on my infinite runner.

 

"

highest priority

 

Hi all, check this out:
https://github.com/Ayfel/PrefabLightmapping

cheers
~be

 

Thanks for the script - I can't seem to get it to work unfortunately. The lightmap just won't apply when I run it on the phone, or when I drop the prefab into the main scene either. I tried messing with the lightmap modes too but I just can't get it to work. I'm placing the prefab in AR. I also tried it with Auto Generate turned both off and on. Any help would be greatly appreciated. Thank you.