[Solved] CS45500 Homework 5

This is an optional, extra credit homework assignment. Your score on this assignment will be added to your scores on the other four assignments and then the total will be divided by four. Your homework grades will be 70% of your course grade and the exam will be the other 30%.

This assignment makes use of the files contained in this zip file.

This assignment uses model transformations and a hierarchical scene.

In the zip file there is a folder called demo. In that folder there is a file called hw5_demo.cmd. If you double click on that file you can run a demo of the program you need to write. The program creates a hierarchical scene and lets the user manipulate the models in the scene. The scene has models of the letters P, N, and W grouped into a PNW. The scene graph looks like this.

               Scene              /                  /              Camera         List<Position>                            |                            |                         Position                         /  |                            /   |                            /    |                        Matrix   null    List<Position>                                  /       |                                        /        |                                        /         |                                        /          |                                Position         Position        Position                     /  |             /  |            /   |                      /   |            /   |           /    |                  Matrix   P  empty  Matrix  N  empty  Matrix  W   empty

Notice that there are four matrices in the scene graph, one for each of the three letter models and one matrix that manipulates the whole PNW group. The demo program uses the / key to cycle through the three letter models and the PNW group so that the user can manipulate each letter individually or the whole PNW group. When a letter model (or the group) is chosen, the key commands should manipulate that chosen model (the model manipulation keys are the keys that translate the model, rotate the model, scale the model, and change the color of the model). Notice that when the PNW group is selected, its three sub-models move together and should remember their relative state within the group.

Use the program PNWBuilder.java from the zip file as your starting point. Start by adding code that creates the above scene graph. Then change the key handler code so that the model manipulation commands affect the chosen model. Your program will need a way to remember the position and orientation of each model. Look at the program InteractiveModels_R7.java (from renderer_8.zip) for hints of how to do this.