Weapon Reticle:  Blender GLSL Materials

 
 
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17.  Add a Controller

Note:
For this example I'm using the AND Controller.

Buttons Window menu >> Logic (F4)
Controllers
Add
AND
 

  
18.  Add an Add Overlay Scene Actuator

Buttons Window menu >> Logic (F4)
Actuators
Add
Scene
Add Overlay Scene
SCE:  Name of Overlay scene holding weapon reticle


   
19.  Connect the Sensor >> Controller >> Actuator

Buttons Window menu >> Logic (F4)
Pull wire from brass bump to brass dimple

 
   
20.  Start Game Engine

P key
or
User Preference menu >> Game >> Start Game   



  
  
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