课程名称︰虚拟实境 课程性质︰选修 课程教师：欧阳明 开课学院：电资学院 开课系所︰资工所、网媒所 考试日期（年月日）︰2011.05.02 考试时限（分钟）： 试题 : Virtual Reality Mid-Term Exam May 2, 2011 1. (15%) Given the following code, please draw the scene and the movement of each object symbolically (including a cube and a sphere) . (angle1 increases by 3 degrees and angle2 decreases by 5 degrees every frame) glPushMatrix(); glPushMatrix(); glRotatef ((GLfloat) angle1, 0.0, 0.0, 1.0); glTranslatef (10.0, 0.0, 0.0); glPushMatrix(); glRotatef ((GLfloat) angle2, 0.0, 0.0, 1.0); glPushMatrix(); glTranslatef (2.0, 0.0, 0.0); glScalef (4.0, 1.0, 1.0); glutWireCube (1.0); glPopMatrix(); glPushMatrix(); glutWireSphere (1.0, 10, 10); glPopMatrix(); glPopMatrix(); glPushMatrix(); glRotatef ((GLfloat) angle2, 0.0, 0.0, 1.0); glTranslatef (4.0, 0.0, 0.0); glPushMatrix(); glScalef (1.0, 1.0, 1.0); glutWireSphere (1.0, 10, 10); glPopMatrix(); glPopMatrix(); glPopMatrix(); glPushMatrix(); glScalef (1.0, 1.0, 1.0); glutWireSphere (1.0, 10, 10); glPopMatrix(); glPopMatrix(); 2. 20% (a) (10%) Please give an example application of Augmented Reality on smart phones. (b) (10%) Microsoft Kinect camera can estimate the depth information of the scene in real-time. Can you give an example of research topics which could be solved or improved by using Kinect? 3. Term project (5%) What is the term project you want to do for this semester? What kind of technical problems will you encounter and have to be solved? 4. (25%) short questions. (a) (5%) Is a typical RPG (role playing game) game considered VR technology? Why and why not? (b) (10%) What is motion parallax? How to estimate the thickness of a brick if front of us, if we have only one good eye and the other eye is blind? (c) (10%) Please describe three cases where it is easy to cause "motion sickness", why? 5. (15%) In your opinion, what are the great technology breakthroughs of Virtual Reality in the past fifteen years? Please list 5 such items in relative importance, and give very short explanations why it is important. 6. (20%) In terms of graphics acceleration, there are at least two approaches been proposed, namely (1) parallel processing or SIMD, such as in the nVidia GeForceX chip set, and (2) binary machines such as the PixelPlanes chip set. (a) (10%) Can you describe the basic idea of how these two approaches can accelerate graphics and the major difference between these two. (b) (10%) There is a functon fast_calculate (A, B, C, x, y) which can be evaluated in parallel, where fast_calculate() can calculate A*x + B*y + C for each pixel position (x, y). For a triangle defined by vertices (0, 3, 0), (0, 0, 0) and (4, 0, 0), please write a parallel procedure using fast_calculate() to draw all the pixels inside this triangle with the shading function (surface normal dot_product light_direction*color_of_light). The surface normal at (0, 3, 0) is (1,0, 0), at (0, 0, 0) is (0,6, 0.8, 0), and at (4, 0, 0) is (0, 1, 0), and the light is at (0, 0, 20) with the color (R, G, B) = (200, 0, 200). We view this triangle from Z axis above, and please provide the precise A, B, C values in your formula. 7. Bonus problem. (10%) From one camera, you are looking at a triangle with known vertex positions, such as A(10, 30, 10), B(80, 30, 10), C(30, 10, 10). (a) (5%) How to determine the distance and orientation of the camera to the triangle? (b) (5%) In actual use, there are cases when one vertex of the triangle is blocked from the camera's view. What would be possible solutions to this problem? Please state your solution clearly and with explanation. --

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