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想计算正方体如水，但是想用二维模拟，但是不知道6自由度那儿的质量和转动惯量怎么填，有人说按照Z方向是1米深度计算质量，也有人说就设置成三维正方体块儿的质量，不知道哪个对，并且z方向的转动惯量也不知道该按照哪个说法计算，求大神指教
http://blog.sina.com.cn/s/blog_599d8faa010121yc.html 参考一下流沙大哥的
