CS 381, Fall 2007
HW #7

General Information

• Submit your answers to the questions, C++ source programs and screenshots of the graphics window to Blackboard by Tuesday, November 20.
• Send source and screebshots only! No executables, project/workspace files, etc.
• Due: Tuesday, November 20 (any time).
• Worth: 20 points.

Homework Policies

Program (20 pts)

• Your program must draw a scene containing at least three different glutSolid 3-D objects, with proper hidden-surface removal.   At least one of the objects must represent a shape with curved surfaces.
  
• Make use of the model/view transformation to place objects, lights, etc., in the scene.
• Allow the user to navigate in your scene using Logo-style turtle graphics user-interface concepts.  Dragging the mouse left or right causes the camera to rotate left or right about its y-axis. Dragging the mouse up or down causes the camera to move forward or backward in the direction it is pointed.  The camera's y coordinate is fixed as it navigates in the x-z plane.  These actions must be implemented by properly using the OpenGL viewing APIs to control the model/view and projection transformations.
• Include proper lighting using the Phong model.  Note that the camera navigation should occur independently of the objects and lights in the scene.  It should be possible to view objects from different positions while the light remains fixed.  Discuss how the shaded appearance of curved surfaces changes as the camera moves.  Explain any effects which change as the camera moves.
  
• Describe the features of your program, include screenshots and descriptions of any Extra Credit (see below) in a text file.
  
• Your program must provide documentation in either a graphics window or a pop-up menu, as in previous assignments.

Extra Credit:

• Add additional objects to create an interesting scene with a theme (sculpture gallery, furniture display,  architectural construction, etc.)
• Allow the user to change the lighting parameters somehow (light properties, material properties, etc.) through a menu.
  
• Add a spotlight located at the camera's position, pointing in the same direction as the camera such that the spotlight moves with the camera and illuminates objects as the camera is aimed at them similar to the lamp on a camcorder.
  
• Allow the user to view, modify, and/or navigate in your scene using one or more of the following user-interface concepts. These must be implemented by properly using the OpenGL model/view and projection transformations.
• Zoom & pan. Here, “pan” means translating horizontally or vertically in order to change the point being viewed; “zoom” means scaling about the point being viewed. Remember that a usable zoom & pan interface does not pan at high speed simply because the zoom is “close in”.  Although zoom & pan is essentially a 2-D interface, your scene must have some 3-D elements.
• Allow modification of model/view transformations affecting the scene, as well as projection transformations affecting the properties of the camera: moving smoothly between narrow-angle and wide-angle “lenses”, etc.
• Flying. The user must be able to move the camera forward (“forward” is the direction the camera is pointing) and turn the camera left/right and up/down. You may implement either an airplane-style interface, where “up” is always the same direction, or a spaceship-style interface where “up” can change.

Project (5 pts)

Note