Add some useful commented lines to SingleParticleWLSPlate.mac

Author: jurenag

macros/generators/SingleParticleWLSPlate.mac

@@ -20,4 +20,10 @@
 #/Generator/SingleParticle/min_phi   4.7123
 #/Generator/SingleParticle/max_phi   4.7123
 
-/Generator/SingleParticle/region whatever
+/Generator/SingleParticle/region whatever
+
+# To throw photons perpendicular to the WLS plate, from above it:
+# /Generator/SingleParticle/min_costheta 0
+# /Generator/SingleParticle/max_costheta 0
+# /Generator/SingleParticle/min_phi   4.71238898038469
+# /Generator/SingleParticle/max_phi   4.71238898038469