Editing a LODGroup from script

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1

Hello Unity Answers!

My current script is raising this exception whenever I try to set LOD levels: “SetLODs: Attempting to set LOD where the screen relative size is greater then or equal to a higher detail LOD level.”

Before I post the actual script, what is supposed to happen, and what is actually happening?

The script is supposed to create a new LODGroup out of a selection of GameObjects. The GameObjects have to be named MyGameObjectName_LOD0, MyGameObjectName_LOD1, etc. This works 100% fine as long as you only have one GameObject selected. When selecting a 2nd or more GameObjects the exception above is raised.

    private void CreateLodGroup()
    {
        GameObject[] sel = Selection.gameObjects;
        if (sel == null || sel.Length == 0)
        {
            Debug.LogError("FAILED -> You must have at least 1 GameObject selected!");
            return;
        }
        var lods = new SortedList<int, GameObject>();
        string mainName = null;
        foreach (GameObject o in sel)
        {
            string oName = o.name;
            Match regexMatch = Regex.Match(oName, @"(.*)_LOD([0-9])");
            if (regexMatch.Success)
            {
                string oMainName = regexMatch.Groups[1].ToString();
                int oIndex = Convert.ToInt32(regexMatch.Groups[2].ToString());
                if (mainName == null || oMainName == mainName)
                {
                    mainName = oMainName;
                }
                else
                {
                    Debug.LogError("FAILED -> The GameObject main names aren't matching! Expected main name \"" +
                                   mainName + "\", got \"" + oMainName + "\"!");
                    return;
                }
                if (!lods.ContainsKey(oIndex))
                {
                    lods.Add(oIndex, o);
                }
                else
                {
                    Debug.LogError("FAILED -> The LOD object with the ID " + oIndex +
                                   " exists twice! Make sure to avoid duplicates!");
                    return;
                }
            }
            else
            {
                Debug.LogError("FAILED -> GameObject \"" + oName +
                               "\" was in the wrong name format to be added as a LOD object!");
                return;
            }
        }
        int lfIndex = lods.Count - 1;
        while (lfIndex >= 0)
        {
            if (lods.ContainsKey(lfIndex))
            {
                lfIndex--;
            }
            else
            {
                Debug.LogError("FAILED -> LOD level " + lfIndex + " could not be found!");
                return;
            }
        }
        var lodObject = new GameObject(mainName);
        var lodGroup = lodObject.AddComponent<LODGroup>();
        var lodLevels = new LOD[lods.Count];
        foreach (var lod in lods)
        {
            float lodSize = (float)Math.Round(1d / lods.Count, 1);
            Debug.Log("LOG -> Size=" + lodSize);
            Renderer[] renderers = lod.Value.GetComponentsInChildren<Renderer>();
            if (renderers == null || renderers.Length == 0)
            {
                Debug.LogWarning("WARNING -> No Renderers for LOD level " + lod.Key + " found!");
            }
            lod.Value.transform.SetParent(lodObject.transform);
            LOD lodLevel = new LOD(lodSize, renderers);
            lodLevels[lod.Key] = lodLevel;
        }
        lodGroup.SetLODs(lodLevels); // <!!> The exception is raised from calling this method! <!!>
    }

I suspect that the exception is raised by a “bad” screenRelativeTransitionHeight (Documentation: http://docs.unity3d.com/). However I have tried out multiple values, all without success. I am kinda stuck here, so Id really appreciate any help possible c:

Thanks,
7BiT.psycho

Btw: The script is being executed in the editor.

2

It worked for me!

LODGroup group = LOD_Parent.GetComponent<LODGroup>();

        LOD[] lod_s_exi = group.GetLODs();
        for ( int i = 0; i < lod_s.Count; i++ )
        {
            MeshRenderer[] renderers = lod_s*.GetComponentsInChildren<MeshRenderer>();*

if ( renderers == null || renderers.Length == 0 )
{
print(“No rendererFinded”);
}
LOD lod = new LOD(lod_s_exi*.screenRelativeTransitionHeight, renderers);*
lod_s_exi = lod;

}

group.SetLODs(lod_s_exi);