Ops 12–6 • Squeeze & Tease Basic Operation Vision Operator’s Manual (v12.0 MD)
Operating Tip — Using the positioner to center the image when it is very far away can be
difficult. It is recommended that you use the knobs or the CLEAR button to center the image if
you are moving it along the Z-Axis. Refer to the section “Image Centering” on page Ops 12-9
for more information.
Parallax Effect
If you are manipulating two images at once, you may notice that the image closer to you appears
to be moving faster than the one that is further away (Figure 12.7). This effect is known as
motion parallax. It occurs because images that are closer to you move further across your field of
view than images in the distance.
Figure 12.7 Parallax Effect
Although both images are moving at the same rate, the closer image will reach the end of the field
of view first, giving the impression that it was moving faster.
Viewpoint and Perspective
Another effect you may notice when you move an image left or right on the X-Axis is that it
appears to change its angle of rotation (Figure 12.8). The image appears to move in a sweeping
motion, although its angle of rotation remains unchanged. This is because the viewpoint is not
being moved along with the image. Since the image is moving but the viewpoint is not, you are
seeing the image from a different angle.
Figure 12.8 Movement and Perspective on the X-Axis
The same effect can be seen when moving an image up or down on the Y-Axis when using a fixed
viewpoint (Figure 12.9). If the image is moved higher in 3D space, you see the image as if you
are looking up at it.
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