Gouraud shading and rasterization are not mutually exclusive. Rasterization is a technique for getting from polygons to pixels, gouraud shading is a technique f

Gouraud shading and rasterization are not mutually exclusive. Rasterization is a technique for getting from polygons to pixels, gouraud shading is a technique for assigning colours to those pixels. Even flat shading is usually done with rasterization.