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 nrays= 	 number of location to shoot rays                       
 dangle= 	 increment of ray angle for one location                
 nangle= 	 number of rays shot from one location                  
 ashift= 	 shift first taking off angle                           
 xs1= 	         x of shooting location                                 
 zs1= 	         z of shooting location                                 
 nangle=101     number of takeoff angles				
 fangle=-45     first takeoff angle (in degrees)			
 rayfile        file of ray x,z coordinates of ray-edge intersections	
 nxz=101        number of (x,z) in optional rayfile (see notes below)	
 wavefile=       file of ray x,z coordinates uniformly sampled in time	
 nt=101         number of (x,z) in optional wavefile (see notes below)	
 infofile=       ASCII-file to store useful information 		
 fresnelfile=    used if you want to plot the fresnel volumes. 		
                default is <fresnelfile.bin> 				
 outparfile=     contains parameters for the plotting software. 	
                default is <outpar> 					
 krecord=        if specified, only rays incident at interface with index
                krecord are displayed and stored			
 prim           =1, only single-reflected rays are plotted 		",     
                =0, only direct hits are displayed  			
 ffreq=-1       FresnelVolume frequency 				
 refseq=1,0,0   index of reflector followed by sequence of reflection (1)
                transmission(0) or ray stops(-1).			
                The default rayend is at the model boundary.		
                NOTE:refseq must be defined for each reflector		
 NOTES:								
 The rayends file contains ray parameters for the locations at which	
 the rays terminate.  							

 The rayfile is useful for making plots of ray paths.			
 nxz should be larger than twice the number of triangles intersected	
 by the rays.								

 The wavefile is useful for making plots of wavefronts.		
 The time sampling interval in the wavefile is tmax/(nt-1),		
 where tmax is the maximum time for all rays.				

 The infofile is useful for collecting information along the		
 individual rays. The fresnelfile contains data used to plot 		
 the Fresnel volumes. The outparfile stores information used 		
 for the plotting software.						



 Author:  Dave Hale, Colorado School of Mines, 02/16/91
 MODIFIED:  Andreas Rueger, Colorado School of Mines, 08/12/93
	Modifications include: functions writeFresnel, checkIfSourceIsOnEdge;
		options refseq=, krecord=, prim=, infofile=;
		computation of reflection/transmission losses, attenuation.
 MODIFIED: Boyi Ou, Colorado School of Mines, 4/14/95

 Notes:
 This code can shoot rays from specified interface by users, normally you
need to use gbmodel2 to generate interface parameters for this code, both
code have a parameter named nrays, it should be same. If you just want to
shoot rays from one specified location, you need to specify xs1,zs1,
otherwise, leave them alone. If you want to shoot rays from surface, you need
to define surface equal to 1. The rays from one location will be
approximately symmetric with direction Normal_direction - ashift.(if nangle is
odd, it is symmetric, even, almost symmetric. The formula for the first take
off angle is: angle=normal_direction-nangle/2*dangle-ashift. If you only want to
see caustics, you specify caustic=1, if you want to see rays which does not
reach surface, you specify nonsurface=1. 
/