Weapon Reticle:  Blender MultiTexture Materials

11.  Map Input:  UV

Buttons Window menu >> Shading (F5) >> Material buttons
Map Input tab
UV button
UV name

12.  Map To tab:  Enable Col button

Buttons Window menu >> Shading (F5) >> Material buttons
Map To tab
Enable Col button

13.  Scale plane holding Weapon Reticle

Plane selected:  Edit mode

Camera View
3D View menu >> View >> Camera
NumPad 0

Scale plane
S key
3D View menu >> Mesh >> Transform >> Scale

14.  Add a Sensor

For this example I'm attaching the sensor/controller/actuator to the active camera. 

For this example I'm using the Keyboard Sensor to add the overlay scene (HUD)

Main Scene:  Active Camera

Buttons Window menu >> Logic (F4)


Download free seamless game textures or you can create your own seamless game textures. Use reference photos to add realism to the seamless texture you create. Textures let you create the style and mood for your computer game. Textures are a way to add detail and color to 3D graphics. Photo realistic textures add realism. Download free game models for your video game or create your own game models. Use the game models in First Person Shooter, role playing games, racing simulations and more. Download free textures to add detail to your game models. You can use the free game models you downloaded or model your own game models.