kimclps:使用說(shuō)明書(shū)Chapter 2 page 26
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G^5 The chief ray (or principal ray) from every field point will be iterated to pass
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:n' through the center (x=0, y=0) of the stop surface, unless you override this behavior
pL*aU=FjQ with chief ray aiming (this is only necessary in a few unusual sit ..
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