Can't Re-Enable Lightmaps after Disabling Them at Runtime

Questions & Answers
1

I’m trying to disable and re-enable my scene’s lightmaps at runtime, but the script I’m using (obtained from here) is only half working.

using UnityEngine;
using System.Collections;

public class UseLightmap : MonoBehaviour {

	// Use this for initialization
	void Start () {
	
	}
	
	// Update is called once per frame
	void Update () {
	
		if (Input.GetKeyDown("up"))
		{
			Change(1);
		}

		if (Input.GetKeyDown("down"))
		{
			Change(0);
		}
	}

	void Change (int i) {

		// Save reference to existing scene lightmap data.
		LightmapData[] lightmap_data = LightmapSettings.lightmaps;

		if (i == 0)
		{
			// Disable lightmaps in scene by removing the lightmap data references
			LightmapSettings.lightmaps = new LightmapData[]{};
		}

		if (i == 1)
		{
			// Reenable lightmap data in scene.
			LightmapSettings.lightmaps = lightmap_data;
		}
	}
}

In this script I’m using the up and down arrow keys to test the on/off functions. The problem is that while I can successfully turn the lightmaps off, I can’t turn them back on. I suspected that the functions might be incorrectly placed, but I couldn’t seem to figure out what the correct placement would be.

I mostly use JS and am not very experienced with C#, so this might not be an ideal setup I have here. I suspect the problem is something simple that I’m just overlooking, but I’ve run into a dead end. Arrays have never been my strong point.

If someone could help me figure out what I’m doing wrong, that would be wonderful!

2

You’re clearing the LightmapSettings and storing it with blank lightmap data, so it will be blank when you re-enable it. Basically you just need to move that line where you store the existing lightmap.

public class UseLightmap : MonoBehaviour {
	
	LightmapData[] lightmap_data;

	// Use this for initialization
	void Start () {
        // Save reference to existing scene lightmap data.
		lightmap_data = LightmapSettings.lightmaps;
	}

	// Update is called once per frame
	void Update () {

		if (Input.GetKeyDown("up"))
		{
			Change(1);
		}
		if (Input.GetKeyDown("down"))
		{
			Change(0);
		}
	}

	void Change (int i) {
		if (i == 0)
		{
			// Disable lightmaps in scene by removing the lightmap data references
			LightmapSettings.lightmaps = new LightmapData[]{};
		}
		if (i == 1)
		{
			// Reenable lightmap data in scene.
			LightmapSettings.lightmaps = lightmap_data;
		}
	}
}