Why is Gouraud shading also referred to as interpolation shading ? Also discuss its advantages and disadvantages.

Gouraud shading :-

• It represents a polygon surface by linearly interpolating intensity across the polygon surface.

• Intensity values for each polygon are matched with adjacent polygon along common edges.

• It eliminates the intensity discontinuity that can occur in constant?intensity shading.

• Gouraud shading is a trick whereby values for lighting, fog, …