求高手帮忙解释一段fish程序
sectionif ver_head = null then
new = get_mem(5)
mem(new) = ver_head
ver_head = new
mem(new+2) = z_pos
mem(new+4) = gp_near(0,0,z_pos)
hnew = get_mem(2)
mem(hnew+1) = node_pnt
mem(new+1) = hnew
mem(hnew)= null
exit section
end_if
求高手帮我解释这段程序,小弟不甚感激。
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