Question

1. What is the coordinate of a point in three-dimensional Euclidean space that corresponds to a point (-2.0, 0.0, 8.0, -0.5) in three-dimensional space expressed in homogeneous coordinates?

2. What is the value of the color (0.7, 0.6, 0.1) expressed in the RGB color model using the CMY color model?

3. What is the name of the OpenGL function associated with the projection transformation where the PRP (Projection Reference Point) is located at point at infinity?

Answer 1

1. (x, y, z, w) in homogeneous coordinates corresponds to (x/w, y/w, z/w) in Cartesian coordinates . Therefore, (-2.0, 0.0, 8.0, -0.5) corresponds to (4, 0, -16)

2. The relationship between two color models is

(0.7, 0.6, 0.1) in RGB corresponds to (0.3, 0.4, 0.9) in CMY

3. The gluFrustum function is associated with the projection transformation where the PRP is located at point at infinity