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principal visual ray

noun
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Definition of principal visual ray

: a perpendicular that extends from a station point to a perspective plane and theoretically passes precisely along the visual axis of a viewing eye

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“Principal visual ray.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/principal%20visual%20ray. Accessed 20 Sep. 2020.

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