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标题: help!! [打印本页]

作者: walnut 时间: 2003-9-30 08:58
标题: help!!
How to model an asphere surface using formula :

z=c(r^2)/(1+sqrt(1-(1+k)(c^2)(r^2))),

k=-2.496, c=1/r, -4.868 <r<4.868

Thank you!!

作者: tzhtytzhty 时间: 2003-10-24 10:46
书上有,

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