Homework 7: Light up the World

Short Description:

Extend program six to provide lights.

This assignment is required to complete the special offer.

Goals

When you finish this homework, you should

Implemented Phong-Blinn lighting.
Add normals to your js models.

Formal Description

Implement Phong-Blinn lighting in homework 6.

Extend offTojs
- Compute vertex normals as described on page 295 of the book.
- Access to these normals should be through the member variable .normals
Modify the ModelDisplay object
- Read the normals
- Transfer these normals to the shaders.
Modify the shaders
- To store and correctly transform the normals.
- To store and correctly employ all values in the Phong-Blinn lighting equation.
Modify the SceneObject from Homework 5.
- Add three uniform variables to describe k_a, k_d, and k_s for each surface.
- Add a uniform variable α for each surface.
- Add member functions to manipulate these properties.
- Modify the Display() function to transfer these properties to the shaders.
Add a light object to your package
- Provide getters and setters to manipulate
  - L_a, L_d, L_s
  - Location
  - Attenuation variables a,b,c
- Add a Display() method that transfers these variables to the shaders.
- Make sure the light object is declared, provided values and called in your program.
Modify the objects so each has a different set of material properties.
Add any other variables or computations needed to complete this project.

Documentation

Your interface should built in a html file. This file should contain documentation discussing the project, including information such as

Problems encountered
Interesting techniques employed
Sources of information
Collaborators
Notes on additions
Screen shots of interesting results.

Please use relative references to your code in the html file. This will allow me to extract the file in my local environment.

Discussion

You should rename your .js files to be .prog so that the tar file can be submitted trough the email.
Please include your own .js model files. Make sure that these are in t your directory.
Please include the common files from ../Common
Please include the modified source code to offTojs

Submission

When you have finished your assignment, please submit a tar file containing all files needed for this project. Please do not post your project on line until after grades have been assigned.