cs4620-08fa-midterm2_soln - CS4620 Fall 2008 Midterm 2...

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CS4620 Fall 2008 Midterm 2 Solution ----------------------------------- Problem 1. 1. This case has diffuse and specular lighting computed per vertex and interpolated, with the diffuse component (but not the specular component) modulated by a texture map. 1a. Positions, normals, and texture coordinates. 1b. The positions are transformed into screen space. The normals are transformed to eye space. Position and normal are used to compute diffuse and specular shading 1c. Texture coordinates, diffuse color, and specular color. 1d. The texture coordinates are used to look up texture color. The diffuse color is multiplied by the texture color and added to the specular. This could also be done by passing scalar diffuse and specular values from the vertex stage. 2. This case has no texture but has colored diffuse and white specular shading, with specular shading computed per fragment. 2a. Positions, normals, and diffuse color. 2b. The positions are transformed to screen space.
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