About occlusion option in WorkShop Simplification? SolidWorks Composer 2014

Hi!

I'm trying to use Simplification feature in SW Composer 2014, but I'm facing several dificulties to understand how the 3D: Speed - Quality command works.

I've read some "Help" topics and I tried to use both options, but still I can not see how it works.

"

3D(Available when Remove internal parts is selected.) Performs occlusion on the 3D model. Snapshots are taken from different points of view. For animation mode, snapshots are taken along the camera animation. Select one of the following:
  • Speed - Uses fewer camera positions resulting in faster computation.
  • Quality - Uses more camera positions.

To perform occlusion on the 2D view, clear this option"

Could someone help me to understand it?

Thanks!

SolidworksComposer