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+ Click Here to Search (Looking For something at vustudents.ning.com?) + Click Here To Join (Our facebook study Group)Computer Graphics (COMP136) Quiz 7
This is a standard multiple choice test. Each question has only one correct answer. Please mark that one answer clearly on the answer sheet provided. If any question ahs more than one answer filled in, it will be marked wrong. There are 20 questions. You will have 20 minutes.
1) The following drawing illustrates which of the following?
A) Interpolating curve
B) Approximating curve
C) Extrapolating curve
Use the following set of curves to match with the questions below.
(A) (B) (C)
2) Which is an example of degree elevation? A
3) Which is an example of deCasteljau subdivision? B
4) Which is an example of a degree 2 curve? B
5) Which of the following properties of rational Bezier curves fails if the weight assigned to a control point is negative? (P.S. The property missing below is Linear Independence of the control functions… FYI)
a) Coordinate System Independence
b) ConvexHull
c) Symmetry
d) Variation Diminishing
e) Endpoint interpolation
6) Which of the following properties of Bezier curves guarantees that a line passes through the control polygon as many times or more times than the line passes through the Bezier curve itself?
a) Coordinate System Independence
b) ConvexHull
c) Symmetry
d) Variation Diminishing
e) Endpoint interpolation
7) Which of the following properties of Bezier curves guarantees that any affine transform performed on the control points also directly applies to the curve itself?
a) Coordinate System Independence
b) ConvexHull
c) Symmetry
d) Variation Diminishing
e) Endpoint interpolation
8) True or false. The Bernstein polynomials as defined in class work for 2D Curves as well as 3D Curves.
a) true
b) false
9) Which of the following parts of our Bezier curve discussion was compared to 3D projections onto a 2D plane?
a) End point tangency
b) deCasteljau subdivision
c) Degree elevation
d) Swept surfaces
e) Rational Beziers (i.e. weights)
10) When extracting surface locations of 3D Bezier surfaces, two techniques were presented: evaluation of the Bernstein polynomials and deCasteljau subdivision. Which of those two allowed for easy and accurate solutions to the surface normal?
a) Evaluation of the Bernstein polynomials
b) deCasteljau subdivision
11) Which of the following is a good use of Bezier volumes?
a) Design of airplane wings
b) Global Illumination rendering
c) Freeform deformation
d) Surface normal extraction
12) If two Bezier curves meet at the same point as shown in the control polygons shown below, what is the MAXIMUM continuity they can have? (NOTE the two edges that meet are not of the same length, but do have the same direction)
a) C^{0}
b) C^{1}
c) C^{2}
d) G^{0}
e) G^{1}
13) True or false. BSplines are a way of creating sets of Bezier curves with a guaranteed continuity at their join points.
a) true
b) false
14) Which of the following is considered the Father of Fractals?
a) Lyle Ramshaw
b) Benoit Mandelbrot
c) Bernard Julia
d) Ivan Sutherland
15) In class, we discussed 3 forms of Fractals. Which one required some randomness and several thousand loop executions to give a result?
a) Nonlinear fractals
b) Iterated Function Systems
c) LSystems
16) In class, we discussed 3 forms of Fractals. Which one could be represented by strings with recursion rules?
a) Nonlinear fractals
b) Iterated Function Systems
c) LSystems
17) Which of the following fractals could have a fractal of degree 2.7?
a) Koch Snowflake
b) A sponge with infinite holes
c) Serpinsky Gadget
d) A fern with very high branching factor
18) In class, two examples were shown of how to use sets of affine transforms to create complex seeming animations. Which required glPushMatrix and glPopMatrix?
a) the cars with wheels spinning around a globe
b) the links of a chain swinging back and forth
19) True or false. When creating an animation of a person walking using sets of affine transforms the animator should set the cycle of the legs to a different control variable than the cycle for the arms.
a) true
b) false
20) In class, we discussed physicallybased simulation. In order to maintain a simulation, a set of variables must be maintained called “state variables”. State variables are those variables which must be maintained from one timestep to the next in a simulation to maintain correct simulation. Of all of the following variables, only one is NOT a state variable. Which is it?
a) mass
b) position
c) velocity
d) acceleration

































































































































































































































































































































































































































































































































































































































Sampling : 
The process of recording the value of some function only at discrete points in the domain. 

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