How are you planning on doing the search light? Are you planning on doing it as 
a semi-transparent cone? If so I would basically recommend looking at the DOF 
nodes (osgSim::DOFTransform), and look to attach the DOF node to your aircraft, 
and then placing your code under the DOF node.  

As per lighting model for the cone of light, it partially depends on what you 
are going for, doing a spot light is more realistic, but is going to be more 
work if you want to sort of pillar of light effect. If you are just looking to 
visualize what a search light would highlight, it just going to be easier to do 
a semi transparent cone.

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