private void OnMouseDown()
{
if (!lastClampedHitPoint.HasValue)
{
return;
}
Vector3 lastPoint = lastClampedHitPoint.Value;
chunkGenerator.VoxelGrid[
(int)lastPoint.x,
(int)lastPoint.y,
(int)lastPoint.z
].VoxelType = 0;
chunkGenerator.GenerateMesh();
}