Changeset 5440 for trunk/MagicSoft/Simulation/Detector/ReflectorII/writemagicdef/writemagicdef.c

Timestamp:

11/21/04 19:19:49 (20 years ago)

Author:

moralejo

Message:

*** empty log message ***

File:

• trunk/MagicSoft/Simulation/Detector/ReflectorII/writemagicdef/writemagicdef.c (modified) (7 diffs)

trunk/MagicSoft/Simulation/Detector/ReflectorII/writemagicdef/writemagicdef.c

@@ -11 +11 @@
   double x_min, y_min, x_max, y_max, a;
   double norm;
-  double step; /* (cm) separation of mirror centers = length of mirror side */
+  double step; // (cm) separation of mirror centers = length of mirror side
 
   long x_index, y_index;
@@ -45 +45 @@
     for (y = y_min ; y < y_max+1; y += step)    
       {
+        // Skip non existent mirrors:
 
         if ( (fabs(x)+fabs(y)) > diameter*0.72)
@@ -55 +56 @@
           continue;
 
+
         x_index = x > 0? (int)(x+50)/100 : (int)(x-50)/100 ;
         y_index = y > 0? (int)(y+50)/100 : (int)(y-50)/100 ;
-
-//      printf("%d %d  %.0f %.0f\n", x_index, y_index, x, y);
 
         i_mirror++;
@@ -73 +73 @@
           phin += 2*PI;
 
-//
-// OLD: (before chessboarding) Valid only if mirror is ON the parabola
-//      xn = - x / sqrt(x*x+y*y+4*ct_f*ct_f);
-//      yn = - y / sqrt(x*x+y*y+4*ct_f*ct_f);
-//      zn = 2*ct_f / sqrt(x*x+y*y+4*ct_f*ct_f);
-//      printf("%.6f %.6f %.6f\n", xn, yn, zn);
-
-//
-//      Shift z for chessboarding:
-//
+        //
+        // Shift z for chessboarding:
+        //
         if (!((x_index+y_index)%2 != 0  || 
               (x_index+y_index) ==  12  || 
@@ -88 +81 @@
               (x_index-y_index) ==  12  || 
               (x_index-y_index) == -12 ) )
-          z += 8.;
+          z += 8.; // cm
 
-//
-// NEW: Valid also (correct focusing) if we shift mirrors from the parabola,
-//      since we use explicitely the z coordinate:
-//
+        //
+        // Calculate orientation of vector normal to the mirror:
+        //
+        // Add the versor pointing from the mirror element center (x,y,z)
+        // to the camera center (0,0,ct_f), and versor (0,0,1). The 
+        // direction of the resulting vector is that of the bisector of 
+        // the two versors. If the normal of the mirror element is 
+        // oriented along that direction, light rays paralel to the
+        // telescope axis and impinging on the center of the mirror
+        // element will be reflected to the center of the camera.
+        // 
+        //
         xn = - x / sqrt(x*x+y*y+(ct_f-z)*(ct_f-z));
         yn = - y / sqrt(x*x+y*y+(ct_f-z)*(ct_f-z));
         zn = 1 + (ct_f - z) / sqrt(x*x+y*y+(ct_f-z)*(ct_f-z));
 
+        //
+        // Normalize the vector to obtain the versor:
+        //
         norm = sqrt(xn*xn+yn*yn+zn*zn);
         xn /= norm;
@@ -103 +107 @@
         zn /= norm;
 
-//      printf("%.6f %.6f %.6f\n\n", xn, yn, zn);
-
-
+        //
+        // Get angle between the normal to the mirror and the 
+        // telescope axis:
+        //
         thetan = acos(zn);
 
         a = 2*ct_f;
 
-//
-// Focal distance of the mirror:
-//
+        //
+        // Focal distance of the mirror:
+        //
         f= 0.5 * (a*sqrt((1.+(x*x+y*y)/(a*a))*
                          (1.+(x*x+y*y)/(a*a))*
@@ -121 +126 @@
         printf("%3d %9.4f %9.4f %9.4f %9.4f %9.4f %9.4f %9.8f %9.8f %9.8f %9.8f %9.8f\n", i_mirror, f, sx, sy, x, y, z, thetan, phin, xn, yn, zn);
       }
-
+  
   return 0;
 }