CS 262, Spring '98

Assignment #1: 10 points

Due Date: Wednesday, 1/30/98


(5)  1.	Review pages 3-1 through 3-14 of the Graph Viewer Tutorial in
	the AVS Tutorial Guide handed out in class.  Display the file
	ascii file growth.dat as a contour plot with the following
	appearance:

	(a) the title of the plot is your last name,
	(b) the axes are labelled 'X' and 'Y',
	(c) the X axis has 2 tic marks and Y axis has 5 tic marks,
	(d) the plot has 10 contour levels.

	Use the Write Data option to save your plot as a Postscript file 
	named contour.ps and print this file using the 'lpr' command on
	ibm1.  (You will need to change the Write Postscript directory 
	to your home directory on ibm1 in order to save this file.)

	The ascii file growth.dat consists of a 6 rows and 3 columns of
	data values.  As a contour plot, the data values represent the
	heights of the data points in 6x3 uniform grid.  

	(e) What are the (X,Y) coordinates of the highest point in the
	contour plot and what is the height of this point?	


(5)  2.	Complete Session 1 of the AVS Geometry Viewer Tutorial on pages 
	2-1 to 2-18 of the AVS Tutorial Guide handed out in class.
	Use the object teapot.geom described in the tutorial to 
	learn how to manipulate objects with the mouse and to
	change the color and surface properties of objects.

 	(a) Describe the visual effect produced by varying each of the 
	following controls using the teapot.geom object: Amb, Diff, 
	Spec, Gloss, Trans and Metal.  

	After you have become familiar with the menu functions for
	the geometry viewer, adjust the color and surface properties
	of the teapot to match the three teapots shown on 
	pages 12 & 14 of the manual.  

	(b) Hand in a list of the surface properties which produce 
	teapots that look like the ones shown in Figures 2-11, 2-12, 
	and 2-13.

	(c) Now use the AVS geometry viewer to study the effect of 
	the following rendering methods on the appearance of the 
	teapot: no light, flat, and gouraud.  Describe the 
	visual appearance of each of these rendering methods.