public void CollectMeshInfo(int maxLodLevel)
{
lodMeshInfos = new LodMeshInfo[maxLodLevel + 1];
for (int lod = 0; lod <= maxLodLevel; lod++)
{
lodMeshInfos[lod] = new LodMeshInfo();
if (layerType == LayerType.SingleMesh_Max4Layer)
{
lodMeshInfos[lod].layerIndices = new int[1];
lodMeshInfos[lod].layerIndices[0] = 0;
}
else
{
lodMeshInfos[lod].layerIndices = new int[trees[0].validNums.Length];
int maxIndex = trees[0].GetMaxValidNumIndex();
for (int i = 0; i < lodMeshInfos[lod].layerIndices.Length; i++)
{
lodMeshInfos[lod].layerIndices[i == maxIndex ? 0 : (i < maxIndex ? i + 1 : i)] = i;
}
}
lodMeshInfos[lod].intVertices = TerrainToMeshTool.GetIntVertices(trees[lod]);
lodMeshInfos[lod].vecNormals = TerrainToMeshTool.GetNormals(lodMeshInfos[lod].intVertices, terrainData);
lodMeshInfos[lod].indices = TerrainToMeshTool.GetIndices(trees[lod], lodMeshInfos[lod].layerIndices);
}
}
//创建某个级别的LOD的网格
public List <Renderer> CreateRenderersForOneLodLevel(int lod)
{
List <Renderer> lodRenderers = new List <Renderer>(10);
if (lod >= 0 && lod < lodMeshInfos.Length)
{
lodRenderers.Clear();
if (lod < 2)
{
bool[] layerValid = new bool[lodMeshInfos[lod].layerIndices.Length];
if (layerType == LayerType.SubMesh)
{
for (int i = 0; i < lodMeshInfos[lod].layerIndices.Length; i++)
{
if (lodMeshInfos[lod].indices[lodMeshInfos[lod].layerIndices[i]].Length > 0)
{
layerValid[i] = true;
}
}
Mesh mesh = TerrainToMeshTool.CreateMesh(terrainData, heights, lodMeshInfos[lod].intVertices, lodMeshInfos[lod].vecNormals, lodMeshInfos[lod].indices, -1);
MeshRenderer renderer = CreateMeshRenderer_SubMesh(mesh, layerValid, lodMeshInfos[lod].layerIndices, lod);
if (renderer)
{
lodRenderers.Add(renderer);
}
}
else if (layerType == LayerType.SingleMesh_Max4Layer)
{
Mesh mesh = TerrainToMeshTool.CreateMesh(terrainData, heights, lodMeshInfos[lod].intVertices, lodMeshInfos[lod].vecNormals, lodMeshInfos[lod].indices, 0);
MeshRenderer renderer = CreateMeshRenderer_SingleMesh(mesh, lod);
if (renderer)
{
lodRenderers.Add(renderer);
}
}
else if (layerType == LayerType.SingleMesh_LayerIndexTexture)
{
Mesh mesh = TerrainToMeshTool.CreateMesh(terrainData, heights, lodMeshInfos[lod].intVertices, lodMeshInfos[lod].vecNormals, lodMeshInfos[lod].indices, 0);
MeshRenderer renderer = CreateMeshRenderer_SingleMesh_TextureIndex(mesh, lod);
if (renderer)
{
lodRenderers.Add(renderer);
}
}
else
{
for (int i = 0; i < lodMeshInfos[lod].layerIndices.Length; i++)
{
Mesh mesh = TerrainToMeshTool.CreateMesh(terrainData, heights, lodMeshInfos[lod].intVertices, lodMeshInfos[lod].vecNormals, lodMeshInfos[lod].indices, i);
MeshRenderer renderer = CreateMeshRenderer_OneOfMultiMesh(mesh, lodMeshInfos[lod].layerIndices[i], i == 0, lod);
if (renderer)
{
lodRenderers.Add(renderer);
}
}
}
}
else
{
List <TerrainToMeshTool.VecInt3> intVertices = TerrainToMeshTool.GetIntVertices(trees[lod]);
List <TerrainToMeshTool.VecNormal> vecNormals = TerrainToMeshTool.GetNormals(intVertices, terrainData);
List <int[]> indices = TerrainToMeshTool.GetIndices(trees[lod], new int[] { 0 });
Mesh mesh = TerrainToMeshTool.CreateMesh(terrainData, heights, intVertices, vecNormals, indices, 0);
GameObject obj = new GameObject("base_lod_" + lod);
MeshRenderer renderer = obj.AddComponent <MeshRenderer>();
MeshFilter filter = obj.AddComponent <MeshFilter>();
renderer.sharedMaterial = matBase;
filter.sharedMesh = mesh;
obj.transform.SetParent(transform, false);
lodRenderers.Add(renderer);
}
}
return(lodRenderers);
}