Lectures 6, 7 and 8

6) Radiosity

7 and 8) Human-Computer Interaction

Exercises Explain what lighting effects radiosity is trying to model that are not modelled by RT or PSC. Describe the basic radiosity algorithm. Fitts' Law: What changes when you have older users? When you measure the speed with which someone can move their elbow? When you measure underwater? Rate the importance of: Speed of Use, Computational Resources, Ease of Learning, Ease of Rememberance, Error Potential for the following applications: Airplane autopilot controls Word processor Push bar on exit door VCR Mechanical pencil Air traffic control display Quake keyboard control Write out the steps in the Goals loop (i.e. intention, specificiation... etc.) for the following goals: Adding 2 + 4 on a calculator Signalling a turn in a car Which part of the Goals loop are difficult to measure and why? In an example in the HCI lectures the speed of emboldening a word using keystrokes and the menu is compared. Develop a similar speed evaluation for using a toolbar button to embolden a word. State which method you think is best and why. Do you see any problems inherent in treating the human as a processor? Would you call user interface design an art? Why or why not? Past Exam Question: Be brief, and answer only the stuff that is covered in this lecture course (i.e. conceptual model, keystroke model, Fitts' and Hick's Laws, interaction styles): 1993/9/5, 1994/9/6, 1995/7/13, 1996/8/10.