multithread mode

When the number of nodes in the scene is very large, cut thread is a about divided cut thread into two parts, one is cut(is_in_view),one is the other(add_for_draw)

A more efficient way is to group nearby nodes under a new one. This allows to cull multiple nodes with just one operation. If you nest this 2 or 3 levels deep, very few calls cull away most invisible nodes. Very efficient

thanks! i will try this