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geometry - Origin-Centred Elliptical "Spotlight" with Conical Light Source of Fixed Aperture - Mathematics Stack Exchange
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Amazon.com : Soonpho Bowens Mount Conical Snoot Kit with 50mm Lens,Optical Spotlight Condenser for Studio Strobe/LED Video Light/Continuous Output Light,with 12pcs Gobos : Electronics
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Cull that cone! Improved cone/spotlight visibility tests for tiled and clustered lighting | Bart Wronski
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