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3D Computer Graphics Project: Creating an Articulated Humanoid with OpenGL and GLUT, Study Guides, Projects, Research of Computer Science

Rensselaer Polytechnic Institute (RPI)Computer Science

A project for csci-4967 students to create a 3d articulated humanoid using opengl and glut. The humanoid, named 'the egghead', consists of a head, neck, torso, shoulders, arms, hips, and legs, each with one degree of freedom. Students must write an opengl program to draw the humanoid, set up viewing and projection transformations, and use lighting and material properties to illuminate the scene. Users can interact with the humanoid using mouse and keyboard events, including rotating joints and changing the viewpoint. The project involves reading a simple animation file and creating a valid animation file of their own.

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Project 2
CSCI-4967: Three-Dimensional Computer Graphics
Due: Friday, October 15, 2004, 11:59:59pm
1 Overview
This project is intended to familiarize you with hierarchical 3D modeling transformations and
lighting in OpenGL. You are to write a program to display an articulated humanoid created from
ellipsoids, and select appropriate lighting and material properties for your scene. You will use
both OpenGL and GLUT functions for modeling the humanoid and lighting the scene, and use
mouse and keyboard input events. You will also need to set up the viewing and projection trans-
formations.
Please see the course web page at www.cs.rpi.edu/˜sakella/graphics/ for project up-
dates and additional information.
2 Project Tasks
You are to write an OpenGL program to draw an articulated humanoid, affectionately known as
“The Egghead”. The humanoid (see Figure 1) has a head and a neck, a torso, two shoulders, two
arms consisting of an upper and lower arm each, a hip, and two legs consisting of an upper leg
and lower leg each. Each body part except the hip can rotate with one degree of freedom. So any
configuration of the Egghead is specified by thirteen angles. You can use glutSolidSphere()
to draw a sphere. You will need to draw the body parts as scaled spheres with transformations
specified as in the figure.
1. Draw the humanoid with its hip centered at the origin (0, 0, 0). Select the initial camera
location to be at (0, 0, 16), and pointing down the negative Zaxis. Let the default projection
mode be perspective projection with a field of view of 45 degrees.
2. The dimensions of each of the body parts of the humanoid are specified in the file
proj2_support.h that is available on the course web page. This file also has code for
loading in a simple animation file.
3. In the default initial configuration with all angles set to zero, the humanoid is in the “touch-
down” position (Figure 1). You may find it helpful to draw the local X Y Z coordinate axes
fixed to each part. All the local (part) coordinate frames are specified to be parallel to the hip
coordinate frame at the origin in the initial configuration. (See the image on the course web
site for a depiction of the coordinate frames.)
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Project 2

CSCI-4967: Three-Dimensional Computer Graphics

Due: Friday, October 15, 2004, 11:59:59pm

1 Overview

This project is intended to familiarize you with hierarchical 3D modeling transformations and lighting in OpenGL. You are to write a program to display an articulated humanoid created from ellipsoids, and select appropriate lighting and material properties for your scene. You will use both OpenGL and GLUT functions for modeling the humanoid and lighting the scene, and use mouse and keyboard input events. You will also need to set up the viewing and projection trans- formations. Please see the course web page at www.cs.rpi.edu/˜sakella/graphics/ for project up- dates and additional information.

2 Project Tasks

You are to write an OpenGL program to draw an articulated humanoid, affectionately known as “The Egghead”. The humanoid (see Figure 1) has a head and a neck, a torso, two shoulders, two arms consisting of an upper and lower arm each, a hip, and two legs consisting of an upper leg and lower leg each. Each body part except the hip can rotate with one degree of freedom. So any configuration of the Egghead is specified by thirteen angles. You can use glutSolidSphere() to draw a sphere. You will need to draw the body parts as scaled spheres with transformations specified as in the figure.

  1. Draw the humanoid with its hip centered at the origin (0, 0, 0). Select the initial camera location to be at (0, 0, 16), and pointing down the negative Z axis. Let the default projection mode be perspective projection with a field of view of 45 degrees.
  2. The dimensions of each of the body parts of the humanoid are specified in the file proj2_support.h that is available on the course web page. This file also has code for loading in a simple animation file.
  3. In the default initial configuration with all angles set to zero, the humanoid is in the “touch- down” position (Figure 1). You may find it helpful to draw the local XY Z coordinate axes fixed to each part. All the local (part) coordinate frames are specified to be parallel to the hip coordinate frame at the origin in the initial configuration. (See the image on the course web site for a depiction of the coordinate frames.)

Figure 1: A humanoid in its initial configuration with all angles set to zero. The XY Z coordinate frame for the hip is shown, with the positive Z axis pointing out of the page. The local coordinate frames for all other parts of the humanoid are parallel to this coordinate frame in this initial con- figuration. The rotation axis for each part, in its local coordinate frame, is indicated in parentheses.

Each (scaled) part is translated as shown in the initial configuration in Figure 1, which is drawn to scale. Each body part rotates about a rotation axis specified in its local coordinate frame (Figure 1). The local coordinate frame depends on the hierarchy of transformations from the hip. You may wish to refer to Chapter 3 of the OpenGL red book for examples of such transformations.

  1. Use lighting and select material properties to illuminate the scene to show off the Egghead. Use different colors to help distinguish adjacent parts of the humanoid.
  2. To enable user interaction using both the mouse and keyboard, write functions to rotate the individual joints of the humanoid, change the viewpoint around the humanoid, and to translate away from and towards the humanoid. The main keyboard events and the corresponding desired behaviors are: - To enable manual control of the individual joints, provide a specified key control for each joint. A detailed listing of the key mappings for controlling the individual joints is provided on the course web site. For example, if a and A specify the motion of the upper arm of the humanoid, a should rotate the upper arm counterclockwise and A should

3 Grading

Your project will be graded for a total of 100 points as follows:

  • 25 points for modeling the humanoid.
  • 15 points for lighting and material properties for the humanoid.
  • 25 points for implementing joint control.
  • 10 points for viewpoint control
  • 10 points for supporting animation of the humanoid (l, o, p keys).
  • 5 points for your animation file of the humanoid.
  • 5 points for code structure, functionality, and documentation.
  • 5 points for any special features or creative enhancements.

Describe any enhancements or special features in your README file, and ensure that they do not interfere with the required project functionality. Lateness policy: Please read the lateness policy in the course syllabus. Use your late days care- fully, if at all.

4 Submission

The code must be submitted no later than 11:59:59 pm on October 15, 2004. You will follow the same submission procedure as for Project 1. Specific instructions for handing in your code are provided on the course web page. You are responsible for ensuring that your code can compile and run on the PCs in VCC South to get project credit. Your source code must be readable and commented. The comments need not be extremely long, just explain clearly the purpose of each block of code. You must submit a single zip file containing your README file, your animate.txt file, your source code (source and header files), and if necessary, a Makefile to compile it. Your submission should NOT include any object files or executable files. Every file (except the animate.txt file) should have your name in a comment line at the top. The README file should contain the following information: your name, email address, instructions on how to compile the code and run it, known bugs or limitations, any extra credit enhancements, and any other relevant information. Proper submission is entirely your responsibility. Contact the TA if you have any doubts whatsoever about your submission. Do NOT submit your project via email. Be sure to keep copies of your files and do not change them after submitting. After grades are posted, you have exactly one week to resolve all problems. All grades are final two weeks after they are posted. A project that does not follow the submission guidelines will receive a 10 point deduction. Please observe the academic integrity guidelines for the course as described in the course syllabus.