Collision Mesh Example

This is an example of a collision mesh.  The mesh that will be draw on the screen (graphical mesh) is outlined in black.  The mesh that will be used for collision testing (collision mesh) is outlined in pink.  Notice how many faces are in the graphical mesh and how many are in the collision mesh. 

Figure 1: A snapshot from Blender showing both the graphical mesh used for drawing and the collision mesh used for physics computation