static void GenerateLODs(GameObject go)
{
// A NOP to make sure we have an instance before launching into threads that may need to execute on the main thread
MonoBehaviourHelper.ExecuteOnMainThread(() => {});
var meshFilters = go.GetComponentsInChildren <MeshFilter>();
if (meshFilters.Length > 0)
{
var lodGroup = go.GetComponent <LODGroup>();
if (!lodGroup)
{
lodGroup = go.AddComponent <LODGroup>();
}
var lods = new LOD[maxLOD + 1];
var lod0 = lods[0];
lod0.renderers = go.GetComponentsInChildren <MeshRenderer>();
lod0.screenRelativeTransitionHeight = 0.5f;
lods[0] = lod0;
var meshes = new List <Mesh>();
for (int l = 1; l <= maxLOD; l++)
{
var lodRenderers = new List <MeshRenderer>();
foreach (var mf in meshFilters)
{
var sharedMesh = mf.sharedMesh;
if (!sharedMesh)
{
Debug.LogWarning("AutoLOD: Missing mesh " + mf.name, mf);
continue;
}
var lodTransform = EditorUtility.CreateGameObjectWithHideFlags(string.Format("{0} LOD{1}", sharedMesh.name, l),
k_DefaultHideFlags, typeof(MeshFilter), typeof(MeshRenderer)).transform;
lodTransform.SetParent(mf.transform, false);
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);
meshLOD.Generate();
}
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 lodsAssetPath = GetLODAssetPath(prefab);
if (File.Exists(lodsAssetPath))
{
meshes.ForEach(m => AssetDatabase.AddObjectToAsset(m, lodsAssetPath));
}
else
{
ObjectUtils.CreateAssetFromObjects(meshes.ToArray(), lodsAssetPath);
}
}
}
}
void OnPostprocessModel(GameObject go)
{
if (!go.GetComponentInChildren <LODGroup>() && meshSimplifierType != null && IsEditable(assetPath))
{
if (go.GetComponentsInChildren <SkinnedMeshRenderer>().Any())
{
Debug.LogWarning("Automatic LOD generation on skinned meshes is not currently supported");
return;
}
var originalMeshFilters = go.GetComponentsInChildren <MeshFilter>();
uint polyCount = 0;
foreach (var mf in originalMeshFilters)
{
var m = mf.sharedMesh;
for (int i = 0; i < m.subMeshCount; i++)
{
var topology = m.GetTopology(i);
var indexCount = m.GetIndexCount(i);
switch (topology)
{
case MeshTopology.Quads:
indexCount /= 4;
break;
case MeshTopology.Triangles:
indexCount /= 3;
break;
case MeshTopology.Lines:
case MeshTopology.LineStrip:
indexCount /= 2;
break;
}
polyCount += indexCount;
}
}
var meshLODs = new List <IMeshLOD>();
var preprocessMeshes = new HashSet <int>();
var lodData = GetLODData(assetPath);
var overrideDefaults = lodData.overrideDefaults;
var importSettings = lodData.importSettings;
// It's possible to override defaults to either generate on import or to not generate and use specified
// LODs in the override, but in the case where we are not overriding and globally we are not generating
// on import, then there should be no further processing.
if (!overrideDefaults && !enabled)
{
return;
}
if (importSettings.generateOnImport)
{
if (importSettings.maxLODGenerated == 0 && polyCount <= importSettings.initialLODMaxPolyCount)
{
return;
}
var simplifierType = Type.GetType(importSettings.meshSimplifier) ?? meshSimplifierType;
if (polyCount > importSettings.initialLODMaxPolyCount)
{
foreach (var mf in originalMeshFilters)
{
var inputMesh = mf.sharedMesh;
var outputMesh = new Mesh();
outputMesh.name = inputMesh.name;
outputMesh.bounds = inputMesh.bounds;
mf.sharedMesh = outputMesh;
var meshLOD = MeshLOD.GetGenericInstance(meshSimplifierType);
meshLOD.InputMesh = inputMesh;
meshLOD.OutputMesh = outputMesh;
meshLOD.Quality = (float)importSettings.initialLODMaxPolyCount / (float)polyCount;
meshLODs.Add(meshLOD);
preprocessMeshes.Add(outputMesh.GetInstanceID());
}
}
// Clear out previous LOD data in case the number of LODs has been reduced
for (int i = 0; i <= LODData.MaxLOD; i++)
{
lodData[i] = null;
}
lodData[0] = originalMeshFilters.Select(mf => mf.GetComponent <Renderer>()).ToArray();
for (int i = 1; i <= importSettings.maxLODGenerated; i++)
{
var lodMeshes = new List <Renderer>();
foreach (var mf in originalMeshFilters)
{
var inputMesh = mf.sharedMesh;
var lodTransform = EditorUtility.CreateGameObjectWithHideFlags(mf.name,
k_DefaultHideFlags, typeof(MeshFilter), typeof(MeshRenderer)).transform;
lodTransform.parent = mf.transform;
lodTransform.localPosition = Vector3.zero;
lodTransform.localRotation = Quaternion.identity;
lodTransform.localScale = new Vector3(1, 1, 1);
var lodMF = lodTransform.GetComponent <MeshFilter>();
var lodRenderer = lodTransform.GetComponent <MeshRenderer>();
AppendLODNameToRenderer(lodRenderer, i);
var outputMesh = new Mesh();
outputMesh.name = string.Format("{0} LOD{1}", inputMesh.name, i);
outputMesh.bounds = inputMesh.bounds;
lodMF.sharedMesh = outputMesh;
lodMeshes.Add(lodRenderer);
EditorUtility.CopySerialized(mf.GetComponent <MeshRenderer>(), lodRenderer);
var meshLOD = MeshLOD.GetGenericInstance(meshSimplifierType);
meshLOD.InputMesh = inputMesh;
meshLOD.OutputMesh = outputMesh;
meshLOD.Quality = Mathf.Pow(0.5f, i);
meshLODs.Add(meshLOD);
}
lodData[i] = lodMeshes.ToArray();
}
// Change the name of the original renderers last, so the name change doesn't end up in the clones for other LODs
AppendLODNameToRenderers(go.transform, 0);
if (meshLODs.Count > 0)
{
if (string.IsNullOrEmpty(AssetDatabase.GetAssetPath(lodData)))
{
AssetDatabase.CreateAsset(lodData, GetLODDataPath(assetPath));
}
else
{
var objects = AssetDatabase.LoadAllAssetsAtPath(GetLODDataPath(assetPath));
foreach (var o in objects)
{
var mesh = o as Mesh;
if (mesh)
{
UnityObject.DestroyImmediate(mesh, true);
}
}
EditorUtility.SetDirty(lodData);
}
meshLODs.ForEach(ml => AssetDatabase.AddObjectToAsset(ml.OutputMesh, lodData));
if (saveAssets)
{
AssetDatabase.SaveAssets();
}
// Process dependencies first
var jobDependencies = new NativeArray <JobHandle>(preprocessMeshes.Count, Allocator.Persistent);
var i = 0;
meshLODs.RemoveAll(ml =>
{
if (preprocessMeshes.Contains(ml.OutputMesh.GetInstanceID()))
{
jobDependencies[i++] = ml.Generate();
return(true);
}
return(false);
});
// Process remaining meshes
foreach (var ml in meshLODs)
{
ml.Generate(jobDependencies);
}
jobDependencies.Dispose();
}
}
else
{
// Don't allow overriding LOD0
lodData[0] = originalMeshFilters.Select(mf =>
{
var r = mf.GetComponent <Renderer>();
AppendLODNameToRenderer(r, 0);
return(r);
}).ToArray();
for (int i = 1; i <= LODData.MaxLOD; i++)
{
var renderers = lodData[i];
for (int j = 0; j < renderers.Length; j++)
{
var r = renderers[j];
var lodTransform = EditorUtility.CreateGameObjectWithHideFlags(r.name,
k_DefaultHideFlags, typeof(MeshFilter), typeof(MeshRenderer)).transform;
lodTransform.parent = go.transform;
lodTransform.localPosition = Vector3.zero;
var lodMF = lodTransform.GetComponent <MeshFilter>();
var lodRenderer = lodTransform.GetComponent <MeshRenderer>();
EditorUtility.CopySerialized(r.GetComponent <MeshFilter>(), lodMF);
EditorUtility.CopySerialized(r, lodRenderer);
AppendLODNameToRenderer(lodRenderer, i);
renderers[j] = lodRenderer;
}
}
}
List <LOD> lods = new List <LOD>();
var maxLODFound = -1;
for (int i = 0; i <= LODData.MaxLOD; i++)
{
var renderers = lodData[i];
if (renderers == null || renderers.Length == 0)
{
break;
}
maxLODFound++;
}
var importerRef = new SerializedObject(assetImporter);
var importerLODLevels = importerRef.FindProperty("m_LODScreenPercentages");
for (int i = 0; i <= maxLODFound; i++)
{
var lod = new LOD();
lod.renderers = lodData[i];
var screenPercentage = i == maxLODFound ? 0.01f : Mathf.Pow(0.5f, i + 1);
// Use the model importer percentages if they exist
if (i < importerLODLevels.arraySize && maxLODFound == importerLODLevels.arraySize)
{
var element = importerLODLevels.GetArrayElementAtIndex(i);
screenPercentage = element.floatValue;
}
lod.screenRelativeTransitionHeight = screenPercentage;
lods.Add(lod);
}
if (importerLODLevels.arraySize != 0 && maxLODFound != importerLODLevels.arraySize - 1)
{
Debug.LogWarning("The model has an existing lod group, but it's settings will not be used because " +
"the specified lod count in the AutoLOD settings is different.");
}
var lodGroup = go.AddComponent <LODGroup>();
lodGroup.SetLODs(lods.ToArray());
lodGroup.RecalculateBounds();
// Keep model importer in sync
importerLODLevels.ClearArray();
for (int i = 0; i < lods.Count; i++)
{
var lod = lods[i];
importerLODLevels.InsertArrayElementAtIndex(i);
var element = importerLODLevels.GetArrayElementAtIndex(i);
element.floatValue = lod.screenRelativeTransitionHeight;
}
importerRef.ApplyModifiedPropertiesWithoutUndo();
s_ModelAssetsProcessed.Add(assetPath);
}
}