Stereopair Rotation Angle
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Dialog Box - called from: Input2 Menu

When either 2D Stereopair, OpenGL Stereopair, OpenGL Quad Stereo or Direct3D Stereo Drawing mode is selected, two images of the structure will be drawn. The left or left-eye image will be rotated by the stereopair Rotation angle clockwise from the normal orientation, and the right-eye image will be rotated the same amount counter-clockwise. If shading is active the illumination vector will be rotated along with the structure. The stereopair rotation angle is typically about 3 degrees, although the proper angle may vary depending on the perspective distance, the actual viewing method, etc.

If the hard copy of stereopairs is to be viewed directly or with a small viewer, a frame size in the dot-matrix or pen plot of 4 to 5 inches across will give a distance between the two images about equal to the normal interocular distance.

Few people can directly view a stereo pair as shown on the full screen because the images are considerably further apart than the eyes. However, if a negative rotation angle is used, some people can view the image by crossing their eyes.

The two images are separated in the 2D Stereopair and OpenGL Stereopair but superimposed by viewing hardware in OpenGL Quad Stereo or Direct3D Stereo modes.

The rotation angle can also be set in the DialogBar - Right