Sidney's 6.837 Project 3 Applet

Project 3 is a three-dimensional transformation matrix class. The class Matrix3D performs viewing and modelling transformations on three-dimensional points. It includes perspective and orthographic viewing transformations given vectors for the camera position, the position we are looking at, and an up direction vector. It also includes modelling transformations such as translation, rotation, scaling, and skew.

Directions:

Please use Internet Explorer 4.0 or higher or appletviewer using JDK 1.1 or higher.
Mouse Controls

Left Click - rotates the object
Right Click - loads the identity matrix into the modelling matrix

GUI Controls

Choice Menu - The menu is divided into viewing and modelling transformtions (separated by the line). Choose the transformation you wish to apply to the model.
- Perspective and Orthographic are viewing transformations. They will reset both the viewing and modelling matrices.
- Translate, Scale, and Skew are modelling transformations. They will add to the current modelling matrix.
Input Fields - These fields will only be active for the modelling transformations. Input the desired translation, scaling, or skew factors in the x, y, and z directions.
Go Button - Press this button to apply the transformation specified in the transformation Choice Menu and when appropriate, using the values specified in the Input Fields.

Source Code

Applet Code (classes are located in the same file)

TestMatrix.java - This class is based on Professor McMillan's TestMatrix class which performed functions such as reading in .obj files that specify eye, look, up vectors and the field of view and also handling mouse events. I added a user interface for applying different viewing and modelling transformations. I also added methods for handling events dealing with the user interface
TestMatrixListener.java - This class implements the ActionListener interface and handles action events such as the clicking of the "Go" button.
ChoiceListener.java - This class implements the ItemListener interface and handles events with the choices menu such as enabling or disabling the input fields or the "Go" button based on the menu choice.

Matrix and Point Code

Matrix3D.java - This class is the main part of the project. It manages the functionality of the transformations and stores the transformation matrices. Note that the matrix is represented as a 4x4 matrix in the Matrix3D.java since we must accomodate a mixture of matrix multiplications and vector additions.
Point3D.java - This is a utility class for describing three-dimensional points/vectors.