1. Vertical Orientation
Vertical lenticular lenses deliver separate images to the left and right eye of an observer.
With
a vertically oriented lens focusing on a vertically interlaced series
of images it is possible create a 3D effect by utilizing the human
brain’s natural desire to fuse two images, each seen from the slightly
different perspective of each eye, into a depth map of the scene.
A
typical 3D piece of art will contain items at varying depths. From
foreground to background the overlapping of the images help to enhance
the 3D effect. As a user shifts their focus the perception is that each
layer would shift accordingly. Just as a tree far away would not shift
greatly in the field of vision of an observer, the background of the
image will stay primarily static. Items that are closer in the field of
depth will have less movement, but may also be required to appear more
in focus.
Each
interlaced layer is taken from a slightly different viewing angle. As a
viewer shifts laterally they see each subsequent image as if they have
just changed their perspective on the scene. This is why each lenticular
surface has an optimal viewing distance. At such a distance the effect
of the shift is in line with how much an observer has moved. That means
if they shift their head 5 degrees they will be transitioned to an image
that is from a perspective that is also 5 degrees different. The
construction of the lens defines this viewing angle.
Some great resources for more knowledge
A simple animated .gif explaining the basics of lenticular.
Glossary of lenticular terms.
Lenstar.org has a good overview of lenticular and is usually up on current trends.
And below a great youtube video (not mine) that helps to explain the principles.
Back to 3dEngr's 10 Things about lenticular or go to #2 Horizontal Orientation
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