Draft: testing drich optics and focal plane

Hacked dRICh for optics testing purposes only. Do not merge.

The dRICh optics are contained in a giant volume of C2F6, so we can easily throw optical photons from the IP. This will help us check parameters such as the focal plane of the spherical mirrors.

Example test:

compact/display.xml

@@ -77,12 +77,12 @@
     <vis name="ci_GEMVis"  r= "0.8"  g="0.4"  b="0.3" alpha="0.8" showDaughters="true" visible="true"/>
     <vis name="ci_HCALVis"  r= "0.6"  g="0"  b="0.6" alpha="1.0" showDaughters="true" visible="true"/>
 
-    <vis name="DRICH_vessel_vis"  alpha="1.0" r="1.0" g="1.0" b="1.0" showDaughters="true" visible="true" />
-    <vis name="DRICH_gas_vis"     alpha="1.0" r="1.0" g="0.0" b="0.0" showDaughters="true" visible="true" />
+    <vis name="DRICH_vessel_vis"  alpha="0.1" r="1.0" g="1.0" b="1.0" showDaughters="true" visible="false" />
+    <vis name="DRICH_gas_vis"     alpha="0.1" r="1.0" g="0.0" b="0.0" showDaughters="true" visible="false" />
     <vis name="DRICH_aerogel_vis" alpha="1.0" r="0.0" g="1.0" b="1.0" showDaughters="true" visible="true" />
     <vis name="DRICH_filter_vis"  alpha="1.0" r="1.0" g="1.0" b="0.0" showDaughters="true" visible="true" />
     <vis name="DRICH_mirror_vis"  alpha="1.0" r="0.5" g="0.5" b="0.5" showDaughters="true" visible="true" />
-    <vis name="DRICH_sensor_vis"  alpha="1.0" r="0.0" g="1.0" b="0.0" showDaughters="true" visible="true" />
+    <vis name="DRICH_sensor_vis"  alpha="1.0" r="1.0" g="0.0" b="0.0" showDaughters="true" visible="true" />
 
   </display>