public TerrainGroup(SceneManager sm, Alignment align, ushort terrainSize,
float terrainWorldSize)
{
_sceneManager = sm;
_alignment = align;
_terrainSize = terrainSize;
_terrainWorldSize = terrainWorldSize;
_origin = Vector3.Zero;
_filenamePrefix = "terrain";
_filenameExtension = "dat";
_resourceGroup = ResourceGroupManager.DefaultResourceGroupName;
_terrainSlots = new Dictionary<uint, TerrainSlot>();
_defaultImportData = new ImportData();
_defaultImportData.TerrainAlign = align;
_defaultImportData.WorldSize = terrainWorldSize;
_defaultImportData.DeleteInputData = true;
}
/// <summary>