Re: SAY YES TO "PSEUDO"!

[P3D Larry Berlin <lberlin@xxxxxxxxx>]

>Date: Wed, 5 Feb 1997 5:53:37 -0600
>From: P3D  Chuck Field writes:
>..................
>George said,
>
>>>"Tip:  Cross view images intended for parallel viewing or parallel view 
>images intended for cross viewing." <<
>
>and this sounds fine.... except... when I free view, I'm not 100 per cent 
>sure if I'm cross viewing or parallel viewing.......................

************    One way to find out is to intentionally cross view a stereo
pair by using your finger as a focal point in establishing the right viewing
convergence. Hold your finger between you and the image and while staying
focused on your finger, slowly move it closer or farther from your eyes
until in the background you notice the two images merge into the three
images with the center in stereo. If you use a designated parallel image,
this crossed view will be pseudoscopic. Try the finger approach anytime you
are curious which method you are using. If you are viewing crossed you can
place your finger into the image itself.

The other method of freeviewing in which you start with your nose at the
image, results generally in a parallel view because you are too close to the
image to cross your eyes right away. Another factor is the image size. Large
images cannot be freeviewed in parallel because you would have to shift your
eyes out beyond a parallel position long before you would have the correct
viewing angle. So if the images are fairly large (each image greater than
about 2 1/2 inches wide) you can only cross view them.

Take your time with an image you like and study the depth factors detail by
detail, then rearrange the pictures and try again. This is the best way.
Work on your computer using images from the internet.

Larry Berlin

Email: lberlin@xxxxxxxxx
http://www.sonic.net/~lberlin/
http://3dzine.simplenet.com/


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