int CheckNeedBorder(TerrainChunk chunk, int x, int z)
{
TerrainChunk other = null;
var chunkIdx = new ChunkIdx(chunk.chunkIdx.X + x, chunk.chunkIdx.Z + z);
visibleChunk.TryGetValue(chunkIdx, out other);
return(other != null && other.targetLod == chunk.targetLod + 1 ? 1 : 0);
}
void UpdateTerrainChunk()
{
for (int i = -ViewDist; i <= 2 * ViewDist; ++i)
{
for (int j = -ViewDist; j <= 2 * ViewDist; ++j)
{
if (IsChunkVisible(i, j))
{
TerrainChunk chunk = null;
var chunkIdx = new ChunkIdx(currentIdx.X + i, currentIdx.Z + j);
visibleChunk.TryGetValue(chunkIdx, out chunk);
if (chunk == null)
{
chunk = new TerrainChunk(chunkIdx, ChunkSize, TerrainMaterial);
}
chunk.UpdateLod();
visibleChunk[chunkIdx] = chunk;
}
}
}
for (int i = -ViewDist; i <= 2 * ViewDist; ++i)
{
for (int j = -ViewDist; j <= 2 * ViewDist; ++j)
{
if (IsChunkVisible(i, j))
{
TerrainChunk chunk = null;
var chunkIdx = new ChunkIdx(currentIdx.X + i, currentIdx.Z + j);
visibleChunk.TryGetValue(chunkIdx, out chunk);
chunk.borderInfo = CheckNeedBorder(chunk, -1, 0) +
(CheckNeedBorder(chunk, 0, 1) << 1) +
(CheckNeedBorder(chunk, 1, 0) << 2) +
(CheckNeedBorder(chunk, 0, -1) << 3);
chunk.UpdateChunk();
}
}
}
var outsideChunkds = visibleChunk.Keys.Where((chunkIdx) => !IsChunkVisible(chunkIdx.X - currentIdx.X, chunkIdx.Z - currentIdx.Z)).ToList();
foreach (var chunkIdx in outsideChunkds)
{
var chunk = visibleChunk[chunkIdx];
chunk.Destroy();
visibleChunk.Remove(chunkIdx);
}
}
// Update is called once per frame
void Update()
{
var pos = Viewer.position;
var x = Mathf.FloorToInt(pos.x / ChunkSize);
var z = Mathf.FloorToInt(pos.z / ChunkSize);
if (currentIdx == null || currentIdx.X != x || currentIdx.Z != z)
{
currentIdx = new ChunkIdx(x, z);
UpdateTerrainChunk();
}
}
public TerrainChunk(ChunkIdx idx, float chunkSize, Material material)
{
chunkIdx = idx;
center = new Vector2(chunkIdx.X * chunkSize, chunkIdx.Z * chunkSize);
obj = new GameObject(chunkIdx.ToString());
meshFilter = obj.AddComponent <MeshFilter>();
meshRenderer = obj.AddComponent <MeshRenderer>();
meshCollider = obj.AddComponent <MeshCollider>();
previousLod = -1;
meshRenderer.material = material;
obj.transform.position = new Vector3(center.x, 0, center.y);
meshData = new LodMesh[MAX_LOD + 1];
for (int i = 0; i < MAX_LOD + 1; ++i)
{
meshData[i] = new LodMesh(i, UpdateChunk);
}
generator.RequestMapData(center, OnReceivedMapData);
}
