![]() ![]() ![]() In this case, the retinal speed alone is only informative about the absolute distance in depth relative to fixation, i.e., objects close to fixation move slower on the retina than objects far away from fixation. However, usually observers fixate a stationary object under these conditions, so that the eyes move in a direction opposite to the translation. As a consequence of the translational motion, close objects move faster on the retina than far objects. Motion parallax is an informative depth cue if an observer is translating in a scene. Smooth pursuit eye movements play a crucial role in motion parallax (Rogers & Graham, 1979). The common effect of dot number and motion adaptation suggests that global motion strength can induce a bias to perceive the stronger motion in the back. The differences between perceived depth order and initial pursuit preferences and the slow adjustment of pursuit indicate that perceived depth order is not determined solely by the eye movements. After 300 to 500 ms, smooth pursuit eye movements adjusted to perception and followed the surface whose direction had to be indicated. Smooth pursuit eye movements showed an initial preference for surfaces containing more dots, moving in a non-adapted direction, moving at a faster speed, and being composed of larger dots. Surfaces containing more dots, moving opposite to an adapted direction, moving at a slower speed, or moving in the same direction as the eyes were more likely to be seen in the back. Here, we investigated the influence of different surface features on the perceived depth order and the direction of smooth pursuit eye movements. ![]() Little is known about the surface features that are used to resolve this ambiguity. ![]() With this one, the image will fade out to start and then back in again as the visitor keeps scrolling.When two overlapping, transparent surfaces move in different directions, there is ambiguity with respect to the depth ordering of the surfaces. Then, the image will appear normal at first and increase in transparency as a visitor scrolls down.įinally, another option is Fade Out In. If you wanted to reverse that, you could choose Fade Out. As the image moves up, it will become less transparent, eventually reaching its original appearance when it reaches the top of a visitor’s viewport (100%). If you set the Bottom viewport to 0% and the Top to 100%, the image will be transparent when it first appears at the bottom of a visitor’s viewport (0%). Set the Level to 10 ( this makes the image very transparent to start).It will continue sliding to the right of its original position as the visitor keeps scrolling ( until it reaches 100%)įor this example, turn on the Transparency option and:.It will reach its original position at the middle of a visitor’s viewport ( visitor’s viewport at 50%).The image will start to the left of the original position when it first appears in a visitor’s viewport ( visitor’s viewport at 0%).What’s more, the image will reach its “original” position when it’s in the middle of the visitor’s viewport ( or, 50%), and it will keep moving until it reaches the top (100%). The Viewport options let you choose when to begin and stop your chosen scrolling effect based on a visitor’s viewport:įor example, if you set the bottom of the viewport to 0% and the top to 100%, the image will start moving as soon as it becomes visible at the bottom of a visitor’s viewport. Next, let’s dig into the Viewport option and see how it works.įirst, it’s important to define the term – a visitor’s viewport is the visible size of a user’s device screen. ![]()
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