Which of the following statements is/are True regarding the solution to the visibility problem in 3D graphics?

S1: The Painter’s algorithm sorts polygons by depth and then paints (scan - converts) each Polygon on to the screen starting with the most nearest polygon.

S2: Backface Culling refers to eliminating geometry with backfacing normals.

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Statement S1: The Painter’s algorithm sorts polygons by depth and then paints (scan - converts) each Polygon on to the screen starting with the most nearest polygon.

This statement is not true. Painter’s algorithm is used while projecting a 3D view on a 2D screen to ensure that which polygons are visible, and which should not.

Painter algorithm sorts polygons by depth, and then paints the farthest polygon first.

Statement S2:  Backface Culling refers to eliminating geometry with backfacing normals.

This statement is true. Back face culling is a technique used to eliminate invisible back facing polygons (which are not facing viewer) from further processing.  Principle behind back face culling is that if a polygon on a 3D model is facing away from you, then it cannot be seen.

Backface curling don't render the curves, which are backface, and not visible. So, it enhances the rendering time.