private void initGravity(Vector3i coord)
{
var block = map[coord];
var pos = coord.to_f() - center;
var dirs = GetGravities(pos, gravityTolerance);
foreach (var dir in dirs)
{
block.SetGravity(dir);
}
var gravities = GetGravities(pos, 1.0f);
if (gravities.Count > 0)
{
block.mainGravity = gravities [0];
}
if (block.mainGravity.HasValue)
{
var nextCoord = coord.NextCoord(block.mainGravity.Value);
block.hasTop = HasVoxel(nextCoord);
}
}