Demonstration of Spatial Jitter
Before trying this example, if you have not installed a VRML viewer
then please go to these instructions.
Two VRML examples are provided here. In both cases the viewpoint begins
at the origin and the procedure is the same:
after the file is loaded move around a little by left clicking in the
3D area and dragging the mouse. This is so you can
see what motion is like at the origin.
I some cases, e.g. when the web browser is IE, you have to left click
in the window once beforehand.
please select successive viewpoints using the Page Down key or right
click and choos the viewpoint.
The first example shows a
moving object that traverses from left to right and top to bottom. The
motion is smooth
at the initial position (0,0,0). Follow the procedure above when moving
to successive viewpoints. Also note the difference isn the motion,
especially
how the motion becomes increasingly like moving down steps or a dunken
walk at the outer viewpoints.
The second example shows some
geometry that is part of a Heads Up Display (HUD). The HUD consists of
two white graduated rulers and three vertical green 'cross hairs'.
Follow the procedure above when moving to successive viewpoints. The
cross hairs will begin to jitter in relation to the rulers as one moves
around using the left mouse button. The jitter is not noticeable at the
origin but becomes increasingly obvious as one moves futher out.
