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WATER/FOV.INC

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+// Persistence of Vision Raytracer
+//
+// Direction Vectors for various Field of View angles.
+// Use in camera in form :
+//
+//     direction <0 0 FoV_45>
+//
+// The formula used to calculate these is:  FoV = 0.5 / tan(angle/2)
+// You will also need to adjust the location vector if you change FoV and
+// want to keep the same visual distance from your scene.
+ 
+ #declare FoV_15 = 7.595981
+ #declare FoV_30 = 3.732166
+ #declare FoV_45 = 2.414293
+ #declare FoV_60 = 1.732113
+ #declare FoV_75 = 1.303277
+ #declare FoV_90 = 1.000046
+ #declare FoV_105 = 0.767370
+ #declare FoV_120 = 0.577391
+ #declare FoV_135 = 0.414254
+ #declare FoV_150 = 0.267991
+ #declare FoV_165 = 0.131696
+