void GenerateLODs()
{
int maxLOD = 1;
var go = gameObject;
var hlodLayer = LayerMask.NameToLayer(HLODLayer);
var lodGroup = go.GetComponent <LODGroup>();
if (lodGroup)
{
var lods = new LOD[maxLOD + 1];
var lod0 = lodGroup.GetLODs()[0];
lod0.screenRelativeTransitionHeight = 0.5f;
lods[0] = lod0;
var meshes = new List <Mesh>();
var totalMeshCount = maxLOD * lod0.renderers.Length;
for (int l = 1; l <= maxLOD; l++)
{
var lodRenderers = new List <MeshRenderer>();
foreach (var mr in lod0.renderers)
{
var mf = mr.GetComponent <MeshFilter>();
var sharedMesh = mf.sharedMesh;
var lodTransform = EditorUtility.CreateGameObjectWithHideFlags(string.Format("{0} LOD{1}", sharedMesh.name, l),
k_DefaultHideFlags, typeof(MeshFilter), typeof(MeshRenderer)).transform;
lodTransform.gameObject.layer = hlodLayer;
lodTransform.SetPositionAndRotation(mf.transform.position, mf.transform.rotation);
lodTransform.localScale = mf.transform.lossyScale;
lodTransform.SetParent(mf.transform, true);
var lodMF = lodTransform.GetComponent <MeshFilter>();
var lodRenderer = lodTransform.GetComponent <MeshRenderer>();
lodRenderers.Add(lodRenderer);
EditorUtility.CopySerialized(mf, lodMF);
EditorUtility.CopySerialized(mf.GetComponent <MeshRenderer>(), lodRenderer);
var simplifiedMesh = new Mesh();
simplifiedMesh.name = sharedMesh.name + string.Format(" LOD{0}", l);
lodMF.sharedMesh = simplifiedMesh;
meshes.Add(simplifiedMesh);
var meshLOD = MeshLOD.GetGenericInstance(meshSimplifierType);
meshLOD.InputMesh = sharedMesh;
meshLOD.OutputMesh = simplifiedMesh;
meshLOD.Quality = Mathf.Pow(0.5f, l);
}
var lod = lods[l];
lod.renderers = lodRenderers.ToArray();
lod.screenRelativeTransitionHeight = l == maxLOD ? 0.01f : Mathf.Pow(0.5f, l + 1);
lods[l] = lod;
}
lodGroup.ForceLOD(0);
lodGroup.SetLODs(lods.ToArray());
lodGroup.RecalculateBounds();
lodGroup.ForceLOD(-1);
#if UNITY_2018_2_OR_NEWER
var prefab = PrefabUtility.GetCorrespondingObjectFromSource(go);
#else
var prefab = PrefabUtility.GetPrefabParent(go);
#endif
if (prefab)
{
var assetPath = AssetDatabase.GetAssetPath(prefab);
var pathPrefix = Path.GetDirectoryName(assetPath) + Path.DirectorySeparatorChar + Path.GetFileNameWithoutExtension(assetPath);
var lodsAssetPath = pathPrefix + "_lods.asset";
ObjectUtils.CreateAssetFromObjects(meshes.ToArray(), lodsAssetPath);
}
}
}
