斜视角地图

http://dev.gameres.com/Program/Abstract/Thinking/x45chubu.htm

http://leestorm.iteye.com/blog/1129823

http://blog.sina.com.cn/s/blog_6bc2090c0100ocvh.html

http://dev.gameres.com/Program/Abstract/Thinking/iso_concept1.htm

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