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{ New functions for calculating light transmission through prisms. |
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R. Compagnon and F. Di Pasquale (Spring 1992) |
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LESO-PB |
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EPFL |
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CH-1015 LAUSANNE |
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G. Ward modified for new fprism.c 6/30/93 |
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} |
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{ function fprism(A1..A10) performs the calculations |
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A1: length a of the prism panel |
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A2: length b " |
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A3: length c " |
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A4: length d " |
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A5: indice of refraction of the prism material |
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A6: fraction of the incident ray under which the ray propagation inside |
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the prism is aborted (0<A6<1) |
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A7: indicates which face of the prism is covered by a metallic layer |
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1: face beta |
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2: face gamma |
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4: no face |
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A8: reflection factor of the metallic layer (0<=A8<=1) |
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A9: angle tolerance (in radians) for combining rays travelling nearly |
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in the same direction |
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A10: angle tolerance (in radians) for assuming that a ray is directed |
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toward a source |
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function fprism_val(a,b,c,d) is used to pick the necessary output values |
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calculated by fprism |
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a: selector for choosing which value we ask for: |
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0: X direction of the ray |
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1: Y " |
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2: Z " |
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3: transmission or reflection factor of the ray |
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b: selector for choosing which kind of ray we ask for: |
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-1: a reflected ray is expected |
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0: any ray (reflected or transmitted) is expected |
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1: a transmitted ray is expected |
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c: rank of the expected ray (1<=c) |
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} |
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tau1 = fprism_val(3,1,1); |
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dx1 = fprism_val(0,1,1); |
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dy1 = fprism_val(1,1,1); |
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dz1 = fprism_val(2,1,1); |
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tau2 = fprism_val(3,1,2); |
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dx2 = fprism_val(0,1,2); |
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dy2 = fprism_val(1,1,2); |
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dz2 = fprism_val(2,1,2); |
