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assuming the definition of radiance in http://web.cs.wpi.edu/~emmanuel/courses/cs563/write_ups/chuckm/chuckm_BRDFs_overview.html" [Broken], I want to compute the radiance at the point P=(0,0,0) lying on the xy-plane, given a point-source of light at (0,0,1).

The angle [itex]\theta[/itex] in this scenario is 0 because the light source is placed exactly on the zenith of P, so that integral would reduce to 0 and no light would arrive to the point P, which does not sound correct.

where is the misundersting in all this?

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# Basic question on radiometry

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