fixed bad alpha values

Fixed some bad alpha values that made volumes transparent.

src/GenericDetectors/beamline/compact/Beampipe_example.xml

@@ -70,8 +70,8 @@
     <vis name="InvisibleNoDaughters"      showDaughters="false" visible="false"/>
     <vis name="InvisibleWithDaughters"    showDaughters="true" visible="false"/>
     <vis name="GreenVis"       alpha="0.5"  r= "0.0" g="1.0" b="0.0" showDaughters="true" visible="true"/>
-    <vis name="RedVis"         alpha="0.0"  r= "1.0" g="0.0" b="0.0" showDaughters="true" visible="true"/>
-    <vis name="BlueVis"        alpha="0.0"  r= "0.0" g="0.0" b="1.0" showDaughters="true" visible="true"/>
+    <vis name="RedVis"         alpha="0.5"  r= "1.0" g="0.0" b="0.0" showDaughters="true" visible="true"/>
+    <vis name="BlueVis"        alpha="0.6"  r= "0.0" g="0.0" b="1.0" showDaughters="true" visible="true"/>
     <vis name="OrangeVis"      alpha="0.5"  r= "1.0" g="0.45" b="0.0" showDaughters="true" visible="true"/>
     <vis name="RedGreenVis"    alpha="0.5"  r= "1.0" g="1.0" b="0.0" showDaughters="true" visible="true"/>
     <vis name="BlueGreenVis"   alpha="0.5"  r= "0.0" g="1.0" b="1.0" showDaughters="true" visible="true"/>
@@ -97,10 +97,12 @@
 
   <!--  Definition of the readout segmentation/definition  -->
   <readouts>
+    <!--
     <readout name="EcalBarrelHits">
       <segmentation type="CartesianGridXY" grid_size_x="3.5 * mm" grid_size_y="3.5 * mm"/>
       <id>system:6,barrel:3,module:4,layer:6,slice:5,x:32:-16,y:-16</id>
     </readout>
+    -->
   </readouts>
 
   <plugins>