Replace Mesh

1.  Engine: Blender Game
  • Info menu >> Render Engine box >> Blender Game
Note:
  • There are menus that are only available when the Blender Game render engine is selected.
2.  Create the model 
  • 3D View menu >> Add >> Mesh >> Cube
     
  • 3D View menu >> Mode box >> Object Mode
Note:
  • For this tutorial, the model I'm using is a cube.
3.  Create replacement mesh
  • 3D View menu >> Add >> Mesh >> UV Sphere
     
  • 3D View menu >> Mode box >> Object Mode
Note:
  • The replacement mesh is a mesh from another model

  • The model with the replacement mesh can be on any layer in the blend.  The layer can be hidden or visible

  • The model with the replacement mesh can be any size and shape

  • For this tutorial, the replacement mesh is a UV Sphere.