Saving game objects instantiated in editor?

Unity Engine
,
1

Hi all, I’ve got a system I am working on that creates an array of nodes on the map. So far its working pretty well for what I need, but the only problem is that it can’t save the array when I save the scene. The array gets generated by a button in the editor, but it doesn’t seem like its changing the scene so I can’t save it. Any idaes why this is happening?

using UnityEngine;
#if UNITY_EDITOR
using UnityEditor;
#endif
public class NodeGenerator : MonoBehaviour
{
    public int xSize = 50;
    public int zSize = 50;
    public Terrain terrain;
    public GameObject nodePrefab;
    private GameObject[,] nodeArray;
    void GenerateNodes()
    {
        if (nodeArray != null)
        {
            DeleteNodes();
        }
        nodeArray = new GameObject[xSize, zSize];
        for (int x = 0; x < xSize; x++)
        {
            for (int z = 0; z < zSize; z++)
            {
                float newX = transform.position.x + x + 0.5f;
                float newZ = transform.position.z + z + 0.5f;
                float terrainHeight = terrain.SampleHeight(new Vector3(newX, 0, newZ));
                nodeArray[x, z] = Instantiate(nodePrefab);
                nodeArray[x, z].transform.SetParent(transform);
                nodeArray[x, z].transform.position = new Vector3(newX, terrainHeight, newZ);
                nodeArray[x, z].name = ("Node: " + x + ", " + z);
            }
        }
    }
    void DeleteNodes()
    {
        if (nodeArray == null)
        {
            Debug.Log("No nodes to delete.");
            return;
        }
        for (int x = 0; x < xSize; x++)
        {
            for (int z = 0; z < zSize; z++)
            {
                GameObject node = nodeArray[x, z];
                if (node != null)
                {
                    DestroyImmediate(node);
                }
            }
        }
        nodeArray = null;
    }
#if UNITY_EDITOR
    [CustomEditor(typeof(NodeGenerator))]
    public class NodeGeneratorEditor : Editor
    {
        public override void OnInspectorGUI()
        {
            base.OnInspectorGUI();
            NodeGenerator nodeGenerator = (NodeGenerator)target;
            GUILayout.BeginHorizontal();
            if (GUILayout.Button("Generate Nodes"))
            {
                nodeGenerator.GenerateNodes();
            }
            if (GUILayout.Button("Delete Nodes"))
            {
                nodeGenerator.DeleteNodes();
            }
            GUILayout.EndHorizontal();
        }
    }
#endif
}

I can get around this save problem by doing something like just adding a cube, then save the scene. But would prefer to be able to save after adding the nodes.

2

Gotta dirty your stuff so Unity knows to write it!

These will be invaluable to you:

EditorUtility.SetDirty()

and

Undo.RecordObject()

Go check the docs for which might be best for your use.

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