35 lines
813 B
Plaintext
35 lines
813 B
Plaintext
= Light transport =
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== Radiometry recap ==
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What is radiant flux?
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* total amount of energy passing through a surface (measured per second)
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* Radiant flux in Watts or Joules/second
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=== Why do we not use radiant flux? ===
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* When we emasure a high flux val, we dont know if lots of energy through a
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small surface, or a little energy through a huge surface
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* TLDR its to ambiguous
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New unit irradiance
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* Flux per unit area
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* IE Watt/m^2
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=== Why do we not use irradiance? ===
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We know the surface, but we still need an angle
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* Could be lost of energy in a huge angle
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* little energy in a small angle
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New unit Radiance
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* Flux per unit area angle
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* W / (m^2 * radians)
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== Basic question ==
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How do we calculate how much light exits a surface point in a given direction
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[[maxwell_equations|Maxwell equations]]!
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