[試題] 100上 陳炳宇 遊戲設計 期中考
課程名稱︰遊戲設計
課程性質︰系選修
課程教師︰陳炳宇
開課學院：管院
開課系所︰資管所
考試日期（年月日）︰11/07-11/16
考試時限（分鐘）：帶回家寫
是否需發放獎勵金：是
（如未明確表示，則不予發放）
試題 :
Game Programming
Mid-term Exam.
Date:2011/11/16
1. Please describe the root-base system used for biped characters.
2. Please describe the importance of system analysis in game development.
3. Please describe the three major techniques of character models (the actor
in The Fly) used in real-time 3D games and compare their pros and cons.
4. Consider curves in a two dimensional space defined by figure construction.
In the following questions, assume that four points P0, P1, P2, and P3
are all different and any three points of them are not on a line. Answer the
following question.
a. Consider three control points P0, P1, P2, and line segments connecting them
as in the right figure. Let t be a real number satisfying 0<=t<=1.
Let P0' divide line segment P0P1 in the ratio t:t-1, and, likewise, P1' divide
line segment P1P2 in the ratio t:t-1. Further, let P divide line segment P0'P1'
in the ratio t:t-1. Show that P is expressed as:
P(t) = (1-t)^2P0 + 2(1-t)t P1 + t^2 P2.
b. By moving t from 0 to 1, the point P forms a quadric curve. Is this curve a
part of ellipse, a hyperbola, or a parabola?
c. Add one more control point P3, and determine P in the same way as the above
question a., that is, by repeating interior divisions between beighboring
points (see right figure). Express P(t) as the sum of Pi's each multiplied by a
polynomial of t, as in the above question a.
d. Consider approximating a quarter of circle of radius r by a cubic curve with
four control points as is obtained in the above question c. Points are arranged
as in the right figure. Determine P1 and P2 so that
P(1/2) = (r cos(π/4), r sin(π/4)), is satisfied.
e. Divide the cubic curve in the above question d. into two parts at t = 1/2.
Determine the positions of the two sets of control points that determine the
left and the right curves, so that the divided curves are exactly the same as
the original curve.
You may as well determine them by construction of figures.
5. For the Barycentric coordinate system of a 3D triangle with vertices,
p0(x0,y0,z0), p1(x1,y1,z1), and p(x,y,z), on the plane formed by the triangle
being inside the triangle or not?
6. In separating axis algorithm, how can we project the vertices of each object
on the axix/plane that is perpendicular to axis/plane we are going to find?
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