Basic HTML version of Foils prepared March 4 1998

Foil 180 Fields in Viewpoint Node - I

From VRML 2 Basic Concepts and Definitions CPS616 -- Information Track of CPS -- Spring Semester 98. by Zeynep Ozdemir, Rob Baker, Meryem Ispirli, Geoffrey C. Fox
Definition and 2 Examples of Viewpoint Nodes for Foil 180(Definition and Examples)
1 position field specifies a 3-D coordinate for the location of viewpoint in the current coordinate system.
2 orientation field specifies a rotation axis and angle with which to rotate the viewpoint.
3 fieldOfView field specifies an angle(in radians) indicating the spread angle of the viewpoints viewing-volume frustrum.
  • The range of the world that is visible to VRML viewpoint can be illustrated by a tapered box with the narrow end at the viewpoint and the wide end at the horizon (called a frustrum).
  • Any shape that falls within the box is visible. As we decrease the field of angle, we taper the box, making it more narrow and decrease the range of the world that is visible.
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