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# QS13: Week 13 Survey Questions

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Question 2

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Question 4

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Question 6

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Question 8

📗 Question 9

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📗 [1 points] Which one of the following psuedo random numbers are between 0 and 1 (including 0 and 1) for every value of t?

0.5 * (sin(t) + 1.0)
fract(sin(t))
abs(sin(t))
floor(sin(t))
ceil(sin(t))
None of the above.

📗 [1 points] Which of the following assigns the value true for every [x, y] in a square and false outside the square? Assume the values of x and y are between 0 and 1.

max(x, y) <= 0.5
max(x - 0.25, y) <= 0.25
max(x * x, y * y) <= 0.5
max(x, y) >= 0.5
sqrt(x * x + y * y) <= 0.5
None of the above.

📗 [1 points] Suppose a 3 by 3 grid (16 psuedo random gradient vectors) is used to generate Perlin noise, the color of one pixel is affected by at most how many gradient vectors? Select one answer.

4
9
16
1
3
None of the above.

📗 [1 points] Which of the following effects are faked in model-centric rendering but is simulated based on physics in ray tracing?

None of the above.

📗 [1 points] Which of the following operations are costly and should be avoided in animation loops? Assume x is a THREE.Mesh.

x.geometry = new THREE.SphereGeometry()
x.material = new THREE.MeshStandardMaterial()
x.rotation.set(1, 1, 1)
x.translateOnAxis(new THREE.Vector(1, 1, 1).normalize(), 1
x.material.color = new THREE.Color(1, 1, 1)
None of the above.

📗 [1 points] If time = [0, 1, 3] and track = new THREE.VectorKeyframeTrack(".position", time, [1, 0, 0, 0, 1, 0, 0, 0, 1]) is added to an animation clip for a mesh, what is the position of the mesh at time = 1? Assume linear interpolation is used.

[0, 1, 0]
[1, 0, 0]
[0, 0, 1]
[2/3, 0, 1/3]
[1/2, 0, 1/2]
None of the above.

[0, 1/2, 1/2]
[0, 1, 0]
[0, 0, 1]
[1/3, 0, 2/3]
[2/3, 0, 1/3]
None of the above.

📗 [1 points] Which of the following THREE.KeyframeTracks are used on correct properties of the mesh? Assume the frame times (indices) and values are correct.

THREE.QuaternionKeyframeTrack(".quaternion", ...)
THREE.VectorKeyframeTrack(".rotation", ...)
THREE.ColorKeyframeTrack(".material.color", ...)
THREE.StringKeyframeTrack(".material.color", ...)
THREE.QuaternionKeyframeTrack(".rotation", ...)
None of the above.

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# QS13: Week 13 Survey Questions

# Grade

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