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A square surface to a second square surface located in a perpendicular plane

Function F3D_74 returns the view factor from a square surface to a second square surface located in a perpendicular plane.  The two surfaces share a common corner.  The second surface can be tilted relative to the edge of the first surface by an angle a.

The calling protocol is:

F=F3D_74(N_rays, s1, s2, alpha)

Inputs:

N_rays: number of rays to use in Monte Carlo simulation (if N_rays<=0 then N_rays is set to 1x106)

s1: edge of surface 1 (ft or m)

s2: edge of surface 2 (ft or m)

alpha: angle (deg or rad)

Example: 

$UnitSystem SI Degree

s1=1 [m]

s2=2 [m]

alpha=30 [deg]

N_rays=1e6

F=F3D_74(N_rays, s1, s2, alpha)

{Solution 

F=0.316}

Reference: 

Monte-Carlo procedure programmed by Greg Nellis, Mechanical Engineering Department, University of Wisconsin, Madison, May, 2015