Assignment 3
CMSC 740, Spring 2002
Due: 12:30pm Thursday, April 18, 2002
This assignment involves extending your code for Assignment 2 to deal with a virtual walk-
through of the AV Williams building.
(a) Read the geometry and image data files. The geometry description of the fourth floor of AV
Williams bldg is in the data file avw.dat. The data is in the following ASCII format:
•The first line of the data contains one number that indicates how many “layers” are in the file.
In our file there are 9 layers, so the number is 9. You can think of each layer as containing
similar data (all doors are in one layer, all windows in another, and so on). Then from the
second line onwards, the data for each layer appears as discussed next.
•The data for each layer begins with a line indicating the type of that layer. This line begins
with character“#”. For instance, the second line of the file is: #ARWALL
•The line after the type of the layer contains two numbers, the first one indicates how many
quads are in this layer and the second one indicates the number of triangles (in our data file,
the second number is always 0, since we have no triangles in this file).
•Then comes the actual geometry data. If the layer contains nquads, then the following n
lines will describe the nquads. Each line contains the following information:
x1y1z1x2y2z2x3y3z3x4y4z4r g b
Note that there is a color for each quad. Also note that there is a layer named ARTEXT that
contains extrusions of the appropriate room numbers. You are not required to draw it, but you
might anyway to help you find your way during the walkthrough.
We are providing four texture map files for elevators, ceiling, door, and floor named elv.jpg,
ceiling.jpg,door.jpg, and ground.jpg. The assignment web-page also has the PPM
versions of these files. If you need any other kind of format, please contact the TA. Alternatively, if
you convert them to some other format, make sure that you submit your project with the appropriate
format image files. Write the code to read these texture image files. (3 + 2)
(b) Use your Assignment 2 code to display the data you have read in part (a). Write code to
implement texture mapping for the doors, the ceiling, the floor, and the elevator. For ceiling and
ground you should tile the texture and for the doors you should stretch the texture to cover the
entire door. For now, you can map the door texture to the windows. There is no texture for the
walls. (5).
(c) Implement walking around by mouse movements. Start with user at (54600,22000,200)
and looking along the direction (0,1,0). This is close to the fourth floor elevators. Implement
walking and looking around as follows:
