The derivation formula of section 4 in ray tracing in one weekend? Why | pmurc | ^ 2 = y ^ 2 + z ^ 2?

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CPP
Mar.12,2021

It must be a typographical error. There is no doubt that

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$$\ mathrm {dot} ((p-C), (p-C)) = (x-cx)\ cdot (XMEC) + (y-cy)\ cdot (y-cy) + (z-cz)\ cdot (z-cz) $$

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$\ text {BTW},\\ cdot\\ text {is much more popular than}\ times\\ ast\ text {in mathematics} $

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