CMPS 160 -- Fall 2017

CMPS 160 -- Lab 3

Early if time stamp is before midnight Nov 04, 2017.
On time if time stamp is before midnight Nov 05, 2017.
Late submissions will not be accepted/graded.

Objectives:

Handle multiple light sources and projection types. Also add object selection via picking.

Description:

Add a second light source to the scene. This will be a point light source instead of a directional light source. This will affect how your lighting is calculated for polygonal faces and for vertices.

Allow the user to turn either light on or off by clicking on the graphical representation of the light itself (as opposed to clicking on a toggle button). This is an initial exercise which we will use in your next assignment to do direct manipulation on objects.

So far, we have been using orthographic projection. Here you will provide an option for switching between orthographic and perspective projections using a toggle button.

Details:

Screen dimensions. Set your screen dimensions to 1001 x 1001. Make your x and y axis range from -500 to 500.
2nd light source. Add a second light source while keeping all the functionalities from Prog2. The second light source is a yellow light (1, 1, 0) and is located at (0, 500, 0). With both light sources turned on, you should see contributions from each of them.
Picking. Graphically represent each light source with some geometry. Light source 1 is represented by a red line segment from (0,0,0) to (500,500,500), while light source 2 is represented by a yellow cube centered at (0, 500, 0). Each side of the cube measures 50 units.
Initially, the lights are both turned on. When the user clicks on the red line segment representing light source 1, it toggles the state of the light source (on/off). Likewise, when the user clicks on the yellow cube representing light source 2, it toggles the state of the 2nd light source. To indicate that a light source has been turned off, redraw the geometry in gray. Also, turn off its contribution to the rendering of the GC. Note that the red line segment and the yellow cube are not lit. That is, they are not affected by the presence or absence of light sources.
Projection. Add a toggle to switch between orthographic (default) and perspective projection. For perspective projection, place the viewer somewhere along the positive z-axis e.g. (0, 0, 1000). You may have to experiment a bit with the z-value in conjunction with the field of view (fov) so that the entire GC and the light source geometries are visible in the display.

Resource:

PerspectiveView code from the Matsuda-Lea book.

PickObject code from the Matsuda-Lea book.

Grading:

Rubric:

You start off with 100 points.  You earn additional credit by turning in your assignment
early and/or implementing additional features.  You lose credit for missing functionality,
incorrect results, poorly documented or formatted code, or not following instructions.

Below is a partial list:

- up to 10 points off for poor features.html file
- up to 10 points off for inadequate comments or hard-to-read code
- up to 10 points off for not following instructions
- up to 10 points off for special handling to grade your homework (usually
  because you did not check that it runs on the computers in the lab first).
- functionality points depending on importance

Make sure you:
a.  submit the right files you want us to grade,
b.  have tested your code on the browsers in the lab.
c.  follow the general instructions described in overview.html

Who graded your assignment based on your login name:
```
cole:	a - k
hugh:	l - z
```

Submission:

See course overview for instructions on what to submit and what not to submit.

Put materials in a folder named lab3 and zip it up. Submission must be done using the "submit" command from unix.ucsc.edu

submit cmps160-ap.f17 lab3 lab3.zip