Shape 

Copyright David & Cynthia Thomas, 2009

Drawing 3-Dimensional Objects--Directed Activity: 2-Point Perspective of a Box

Focus	Explore a 2-point perspective model of a box.
Technologies	The Geometers Sketchpad and model 6_Box.gsp.
Background	Depending on your location relative to a box, the view you get of the box is different.  Figure 6.15: 2-Point Perspective of a Box
Tasks	1. Attempt to move each of the vertices of the box.  Interpret the changes in view as changes in your location as an observer. 2. Move the Vanishing Points.  Interpret the changes in view as changes in your location as an observer. 3. Move the drag point.  Interpret the changes in view as changes in your location as an observer.  4. What are the limitations of this model?  Under what conditions does it fail?