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Assignment 3: Introduction to Computer Graphics - Triangle Rendering - Prof. Christopher W, Assignments of Computer Graphics

University of Iowa (UI)Computer Graphics
Prof. Christopher Wyman

An assignment for the introduction to computer graphics course, fall 2005 (22c:151). Students are required to write programs for scan converting triangles and rendering them using opengl and glut. The assignment includes drawing specific triangles with given vertices and colors, as well as rendering white lines. Problems 1 and 2 are worth 10 points each, and answering the optional extra question is worth 2 points.

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Fall 2005
22C:151 Introduction to Computer Graphics
Assignment 3
Due: Wednesday September 14th at 11:59pm
Goal: Write a program that scan converts triangles and outputs them to a PPM file. Write a second program that draws
the same triangles using OpenGL and GLUT.
Problem 1 (10 points): Write a program that draws the following triangles into a 512 ×512 buffer (in memory).
The background should be black (i.e., RGB = [0,0,0]). Output the result to a PPM file, convert the results to JPG,
GIF, PNG, or BMP and display them on your web page. Note coordinates are specified relative to an origin in the
lower-left corner of the image. (This program should not use OpenGL)
•Ared triangle with vertices (1, 1), (31, 1), and (31, 31)
•Awhite triangle with vertices (45, 450), (70, 420), and (95, 450)
•Ablue triangle with vertices (155, 250), (225, 220), and (195, 290)
•Agreen triangle with vertices (80, 220), (150, 250), and (110, 290)
•A triangle with a green vertex at (430, 500), a red vertex at (500, 430), and a blue vertex at (510, 510)
•A triangle with a yellow vertex at (300, 40), a blue vertex at (500, 70), and a white vertex at (450, 80)
•A triangle with a purple vertex at (300, 300), a black vertex at (400, 300), and a black vertex at (300, 400)
•A triangle with a green vertex at (300, 400), a green vertex at (400, 300), and a black vertex at (400, 400)
•Also draw two white lines (use code from Homework 2) from (300, 399) to (400, 399) and from (299, 300) to
(299, 400). (If these overlap with any of the above triangles, please draw the lines over the triangles.)
Problem 2 (10 points): Write an OpenGL/GLUT program that draws the same triangles (and lines) as in Problem
1, using the same colors. Capture the result in an image and post it on your web page. Make sure to label your images,
so I know which is from Problem 1 and which is from Problem 2.
Problem 3 (0 points): How long did this assignment take you? (E-mail answers to cwyman@cs.uiowa.edu)
Answering is optional, but will help me gauge the class — which should help you in the long run.
Extra Credit (2 points): Combine Problems 1 and 2 into a single OpenGL program, with an GLUT keyboard
callback to switch from OpenGL rendering to your scan conversion, making sure to label which approach is currently
being displayed. When using your scan conversion routine, you should use glBegin( GL POINTS ); to draw
individual pixels.

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Fall 2005

22C:151 Introduction to Computer Graphics

Assignment 3

Due: Wednesday September 14th at 11:59pm

Goal: Write a program that scan converts triangles and outputs them to a PPM file. Write a second program that draws the same triangles using OpenGL and GLUT.

Problem 1 (10 points): Write a program that draws the following triangles into a 512 × 512 buffer (in memory). The background should be black (i.e., RGB = [0,0,0]). Output the result to a PPM file, convert the results to JPG, GIF, PNG, or BMP and display them on your web page. Note coordinates are specified relative to an origin in the lower-left corner of the image. (This program should not use OpenGL)

  • A red triangle with vertices (1, 1), (31, 1), and (31, 31)
  • A white triangle with vertices (45, 450), (70, 420), and (95, 450)
  • A blue triangle with vertices (155, 250), (225, 220), and (195, 290)
  • A green triangle with vertices (80, 220), (150, 250), and (110, 290)
  • A triangle with a green vertex at (430, 500), a red vertex at (500, 430), and a blue vertex at (510, 510)
  • A triangle with a yellow vertex at (300, 40), a blue vertex at (500, 70), and a white vertex at (450, 80)
  • A triangle with a purple vertex at (300, 300), a black vertex at (400, 300), and a black vertex at (300, 400)
  • A triangle with a green vertex at (300, 400), a green vertex at (400, 300), and a black vertex at (400, 400)
  • Also draw two white lines (use code from Homework 2) from (300, 399) to (400, 399) and from (299, 300) to (299, 400). (If these overlap with any of the above triangles, please draw the lines over the triangles.)

Problem 2 (10 points): Write an OpenGL/GLUT program that draws the same triangles (and lines) as in Problem 1, using the same colors. Capture the result in an image and post it on your web page. Make sure to label your images, so I know which is from Problem 1 and which is from Problem 2.

Problem 3 (0 points): How long did this assignment take you? (E-mail answers to cwyman@cs.uiowa.edu) Answering is optional, but will help me gauge the class — which should help you in the long run.

Extra Credit (2 points): Combine Problems 1 and 2 into a single OpenGL program, with an GLUT keyboard callback to switch from OpenGL rendering to your scan conversion, making sure to label which approach is currently being displayed. When using your scan conversion routine, you should use glBegin( GL POINTS ); to draw individual pixels.