private void UpdateVisibleChunks()
{
HashSet <Vector2> alreadyUpdatedChunks = new HashSet <Vector2>();
for (int i = visibleTerrainChunks.Count - 1; i >= 0; --i)
{
alreadyUpdatedChunks.Add(visibleTerrainChunks[i].coord);
visibleTerrainChunks[i].UpdateTerrainChunk();
}
int currentChunkCoordX = Mathf.RoundToInt(viewerPosition.x / meshWorldSize);
int currentChunkCoordY = Mathf.RoundToInt(viewerPosition.y / meshWorldSize);
for (int yOffset = -chunksVisibleInViewDist; yOffset <= chunksVisibleInViewDist; ++yOffset)
{
for (int xOffset = -chunksVisibleInViewDist; xOffset <= chunksVisibleInViewDist; ++xOffset)
{
Vector2 viewedChunkCoord = new Vector2(currentChunkCoordX + xOffset, currentChunkCoordY + yOffset);
if (!terrainChunks.TryGetValue(viewedChunkCoord, out TerrainChunk chunk))
{
TerrainChunk newChunk = new TerrainChunk(viewedChunkCoord, heightMapSettings, meshSettings,
detailLevels, colliderLODIndex, transform, viewer, mapMaterial);
terrainChunks.Add(viewedChunkCoord,
newChunk);
newChunk.OnVisibilityChanged += OnTerrainChunkVisibilityChanged;
newChunk.Load();
}
else if (!alreadyUpdatedChunks.Contains(viewedChunkCoord))
{
chunk.UpdateTerrainChunk();
}
}
}
}
void OnTerrainChunkVisibilityChanged(TerrainChunk chunk, bool isVisible)
{
if (isVisible)
{
visibleTerrainChunks.Add(chunk);
}
else
{
visibleTerrainChunks.Remove(chunk);
}
}