Computer graphics problem When evaluating the shading for a pixel inside a trian

Question

Computer graphics problem

When evaluating the shading for a pixel inside a triangle,

(a) Is the color interpolated in Gouraud shading, Phong shading, or both?

(b) Is the normal interpolated in Gouraud shading, Phong shading, or both?

(c) Is the illumination/reflection/lighting model used to compute color at each vertex (in vertex shader) or at each pixel (in pixel/fragment shader) for Phong shading?

(d) Is Gouraud shading more costly than Phong shading?

(e) DoesPhong shading produce better specular highlights for surfaces?

Explanation / Answer

a) Gouraud shading.

Reason: Gouraud shading is color interpolation shading. It is also called smooth shading.

b) Phong shading.

Reason: Phong shading is normal-vector interpolation shading. It is used to interpolates the surface normal vectors rather than the color.

c) reflection model.

Reason:An reflection model is used to compute at each pixel (in pixel/fragment shader) for Phong shading.

d) No.

Reason: Phong shading is more costly than Gouraud shading.

e)Yes.

Reason: The Phong shading produce better specular highlights for surfaces. It allows a light source covers all interor.

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