CS405 Lab 4: Illumination – Examples

For all the examples on this page:

Click on the following link: ftp://ftp.cs.uregina.ca/pub/class/405/ftp/demos/

If you have Internet Explorer's graphical ftp mode turned on you can single click on the "Cpp.zip" file and copy it (CTRL-C) then paste it (CTRL-V) into an appropriate directory to your PC. Or you can drag and drop it.
The "Cpp" directory is necessary for COLOR and LIGHTING*
If you don't have a graphical ftp simply right click on the "Cpp" zip file and save it to an appropriate directory.

Extract the zip file.

Color Cube Example

The following is an example of a color cube. To compile and run it, you have to do the following:

Using the same method as above, get and extract "COLOR.zip" in the same location as the "Cpp" directory.
Using Window's explorer, change into the "COLOR" directory and double click on the .sln file.
Build and execute it. Read the following instructions to correctly operate it.
Instructions for the Color Program:

This program demonstrates the color properties of OpenGL. Only the vertices of the cube are colored. If you have a pretty good video card (one RUNNING at least 16-bit color) then you'll see the interpolation that OpenGL does for colors between vertices. This is SMOOTH shading. If you look closely you'll see the cube dip into the rear clipping plane. A fun thing to do is to see how the animation code works. Try commenting out the animation short-circuit that keeps the frame rate to less than 33 frames/sec and see if you can tell the difference. You can also try turning on FLAT shading and seeing what difference that makes. Try making the window really really small. The animation gets better, but due to the design of the animation code, it doesn't go any faster.

HOME: Resets viewpoint to initial values (animation keeps going)
SHIFT-HOME: reset viewpoint & clear movement vectors
5: Clear movement vectors
Up/Down Arrows: change velocity in Z (if shifted, change rotation)
Left/Right Arrows: change velocity in X (if shifted, change rotation)
Plus/Minus: change velocity in Y (if shifted, change rotation)
ESC: Exit animation

Lighting Examples: LIGHTING 1, LIGHTING 2, and LIGHTING 3

From the above ftp directory, copy LIGHTING 1, LIGHTING 2, and LIGHTING 3
Open and build as instructed above
Instructions for the Lighting Programs:

LIGHTING 1 demonstrates the materials properties of OpenGL and their effect when light shines on the surfaces. The 4x4 matrix of spheres run the gamut of ambient, diffuse, shininess, and specular properties. The only one not demonstrated is emission. The axis arrows indicate increasing values.

LIGHTING 2 demonstrates different diffuse and specular light components on a white object. Notice the green specular with the white diffuse.

LIGHTING 3 demonstrates different lights (positional and directional) which light the text: "OpenGL and Windows"

HOME: Resets viewpoint to initial values (animation keeps going)
SHIFT-HOME: reset viewpoint & clear movement vectors
5: Clear movement vectors
Up/Down Arrows: change velocity in Z (if shifted, change rotation)
Left/Right Arrows: change velocity in X (if shifted, change rotation)
Plus/Minus: change velocity in Y (if shifted, change rotation)
Divide/Multiply: change the resolution of spheres where appllicable
ESC: Exit animation

To Try:

Rewrite the LIGHTING1 example to add two light sources. One light should be a blue individual light. Its intensity should be attenuated. Try to set the quadric term to 2. The light source is in the right side of the gall groups. The other light should be a yellow spotlight lighting the left part of the ball group. The light source is positioned at the viewpoint. Note: Set the light position before the viewing transformation.