274 lines
9.8 KiB
C#
274 lines
9.8 KiB
C#
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using System.Collections;
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using System.Collections.Generic;
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using UnityEngine;
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namespace MeshCombineStudio
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{
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public class CombinedLODManager : MonoBehaviour
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{
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public enum LodMode { Automatic, DebugLod }
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public enum LodDistanceMode { Automatic, Manual }
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public bool drawGizmos = true;
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public LOD[] lods;
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public float[] distances;
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public LodDistanceMode lodDistanceMode;
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public LodMode lodMode;
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public int showLod = 0;
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public bool lodCulled;
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public float lodCullDistance = 500;
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public Vector3 octreeCenter = Vector3.zero;
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public Vector3 octreeSize = new Vector3(256, 256, 256);
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public int maxLevels = 4;
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public bool search = true;
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Cell octree;
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Transform cameraMainT;
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void Awake()
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{
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cameraMainT = Camera.main.transform;
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}
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void InitOctree()
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{
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octree = new Cell(octreeCenter, octreeSize, maxLevels);
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}
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private void Start()
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{
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if (search)
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{
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search = false;
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InitOctree();
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Search();
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}
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}
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void Update()
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{
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if (octree.cellsUsed != null) Lod(lodMode);
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}
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public void UpdateLods(MeshCombiner meshCombiner, int lodAmount)
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{
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if (lods != null && lods.Length == lodAmount) return;
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lods = new LOD[lodAmount];
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float[] newDistances = new float[lodAmount];
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for (int i = 0; i < lods.Length; i++)
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{
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lods[i] = new LOD();
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if (lodDistanceMode == LodDistanceMode.Automatic) newDistances[i] = meshCombiner.cellSize * i;
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else if (distances != null && i < distances.Length) newDistances[i] = distances[i];
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}
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distances = newDistances;
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}
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public void UpdateDistances(MeshCombiner meshCombiner)
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{
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if (lodDistanceMode != LodDistanceMode.Automatic) return;
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for (int i = 0; i < distances.Length; i++) distances[i] = meshCombiner.cellSize * i;
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}
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public void Search()
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{
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for (int i = 0; i < lods.Length; i++)
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{
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lods[i].searchParent.gameObject.SetActive(true);
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MeshRenderer[] mrs = lods[i].searchParent.GetComponentsInChildren<MeshRenderer>();
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for (int j = 0; j < mrs.Length; j++) octree.AddMeshRenderer(mrs[j], mrs[j].transform.position, i, lods.Length);
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}
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}
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public void ResetOctree()
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{
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if (octree == null) return;
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octree.cells = null;
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octree.cellsUsed = null;
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for (int i = 0; i < lods.Length; i++)
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{
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if (lods[i].searchParent != null) Destroy(lods[i].searchParent.gameObject);
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}
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}
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public void Lod(LodMode lodMode)
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{
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Vector3 cameraPosition = cameraMainT.position;
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for (int i = 0; i < lods.Length - 1; i++)
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{
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lods[i].sphere.center = cameraPosition;
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lods[i].sphere.radius = distances[i + 1];
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}
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// if (Benchmark.active) lodBenchmark.Start();
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if (lodMode == LodMode.Automatic) octree.AutoLodInternal(lods, lodCulled ? lodCullDistance : -1);
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else octree.LodInternal(lods, showLod);
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// if (Benchmark.active) lodBenchmark.Stop();
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}
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private void OnDrawGizmosSelected()
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{
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if (drawGizmos && octree != null && octree.cells != null) octree.DrawGizmos(lods);
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}
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[System.Serializable]
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public class LOD
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{
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public Transform searchParent;
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public Sphere3 sphere = new Sphere3();
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public LOD() { }
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public LOD(Transform searchParent)
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{
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this.searchParent = searchParent;
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}
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}
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public class Cell : BaseOctree.Cell
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{
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public Cell[] cells;
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AABB3 box;
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public Cell() { }
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public Cell(Vector3 position, Vector3 size, int maxLevels) : base(position, size, maxLevels) { }
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public void AddMeshRenderer(MeshRenderer mr, Vector3 position, int lodLevel, int lodLevels)
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{
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if (InsideBounds(position)) AddMeshRendererInternal(mr, position, lodLevel, lodLevels);
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}
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void AddMeshRendererInternal(MeshRenderer mr, Vector3 position, int lodLevel, int lodLevels)
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{
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if (level == maxLevels)
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{
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MaxCell thisCell = (MaxCell)this;
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if (thisCell.mrList == null) thisCell.mrList = new List<MeshRenderer>[lodLevels];
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List<MeshRenderer>[] mrList = thisCell.mrList;
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if (mrList[lodLevel] == null) mrList[lodLevel] = new List<MeshRenderer>();
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mrList[lodLevel].Add(mr);
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thisCell.currentLod = -1;
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}
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else
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{
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bool maxCellCreated;
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int index = AddCell<Cell, MaxCell>(ref cells, position, out maxCellCreated);
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cells[index].box = new AABB3(cells[index].bounds.min, cells[index].bounds.max);
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cells[index].AddMeshRendererInternal(mr, position, lodLevel, lodLevels);
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}
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}
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public void AutoLodInternal(LOD[] lods, float lodCulledDistance)
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{
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if (level == maxLevels)
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{
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MaxCell thisCell = (MaxCell)this;
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if (lodCulledDistance != -1)
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{
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float squareDistance = (bounds.center - lods[0].sphere.center).sqrMagnitude;
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if (squareDistance > lodCulledDistance * lodCulledDistance)
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{
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if (thisCell.currentLod != -1)
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{
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for (int i = 0; i < lods.Length; i++)
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{
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for (int j = 0; j < thisCell.mrList[i].Count; j++) thisCell.mrList[i][j].enabled = false;
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}
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thisCell.currentLod = -1;
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}
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return;
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}
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}
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for (int lodIndex = 0; lodIndex < lods.Length; lodIndex++)
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{
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bool intersect;
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if (lodIndex < lods.Length - 1) intersect = Mathw.IntersectAABB3Sphere3(box, lods[lodIndex].sphere);
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else intersect = true;
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if (intersect)
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{
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if (thisCell.currentLod != lodIndex)
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{
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for (int i = 0; i < lods.Length; i++)
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{
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bool active = (i == lodIndex);
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for (int j = 0; j < thisCell.mrList[i].Count; j++) thisCell.mrList[i][j].enabled = active;
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}
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thisCell.currentLod = lodIndex;
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}
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break;
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}
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}
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}
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else for (int i = 0; i < 8; ++i) if (cellsUsed[i]) cells[i].AutoLodInternal(lods, lodCulledDistance);
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}
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public void LodInternal(LOD[] lods, int lodLevel)
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{
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if (level == maxLevels)
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{
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MaxCell thisCell = (MaxCell)this;
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if (thisCell.currentLod != lodLevel)
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{
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for (int i = 0; i < lods.Length; i++)
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{
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bool active = (i == lodLevel);
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for (int j = 0; j < thisCell.mrList[i].Count; j++) thisCell.mrList[i][j].enabled = active;
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}
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thisCell.currentLod = lodLevel;
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}
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}
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else for (int i = 0; i < 8; ++i) if (cellsUsed[i]) cells[i].LodInternal(lods, lodLevel);
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} //===============================================================================================================================
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public void DrawGizmos(LOD[] lods)
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{
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for (int i = 0; i < lods.Length; i++)
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{
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if (i == 0) Gizmos.color = Color.red;
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else if (i == 1) Gizmos.color = Color.green;
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else if (i == 2) Gizmos.color = Color.yellow;
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else if (i == 3) Gizmos.color = Color.blue;
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Gizmos.DrawWireSphere(lods[i].sphere.center, lods[i].sphere.radius);
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}
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DrawGizmosInternal();
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}
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public void DrawGizmosInternal()
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{
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if (level == maxLevels)
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{
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MaxCell thisCell = (MaxCell)this;
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if (thisCell.currentLod == 0) Gizmos.color = Color.red;
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else if (thisCell.currentLod == 1) Gizmos.color = Color.green;
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else if (thisCell.currentLod == 2) Gizmos.color = Color.yellow;
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else if (thisCell.currentLod == 3) Gizmos.color = Color.blue;
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Gizmos.DrawWireCube(bounds.center, bounds.size - new Vector3(0.25f, 0.25f, 0.25f));
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Gizmos.color = Color.white;
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}
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else for (int i = 0; i < 8; ++i) if (cellsUsed[i]) cells[i].DrawGizmosInternal();
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}
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}
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public class MaxCell : Cell
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{
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public List<MeshRenderer>[] mrList;
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public int currentLod;
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}
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}
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}
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