Description: Torus
Display a static picture of a torus and the coordinate system axes.
Instead of using a primitive GL function (such as glOrtho or glFrustum) to set the viewing volume, it instead uses gluPerspective. gluPerspective must be done when the matrix mode is GL_PROJECTION.
Instead of using translates and rotates to position the objects into the view volume, it instead uses gluLookAt to position and orient the camera so that it is looking at the objects. gluLookAt must be done when the matrix mode is GL_MODELVIEW.
Shows that the combination of gluPerspective and gluLookAt is considerably more intuitive than the more primitive mechanism of glFrustum and plain object transformations.
Draws the torus using the fancy glutWireTorus function (which internally calls glVertex a zillion times).
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Torus.txt
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