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Re: FW: Re: FW: Re: [ATM] re:Arbitrary ray origins



mlbrown@everstrive.com wrote:

> Yes, you have to turn N around so that N dot I > 0.  That is, if N dot I <
> 0 then use N = -N

Actually, no.  Assuming this is the last of the two solutions for
entry into the [presumably conic] surface and both are invalid
(with the same definition of N), then the entire ray trace needs
to be aborted as invalid

> 
> In addition, if the argument to the square root is negative, you get total
> internal reflection.

just as you would here.

> 
> =Matt


-- 

Rick S.

http://users.rcn.com/rflrs

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