![]() ![]() I recommend to use 3D software for complex forms. Unfortunately the revolved shapes must be tumbled, but otherwise the result is excellent:Ĭomplex 3D forms are difficult to make to converge well manually and 3D in Illustrator is limited to extrusions and revolutions (also known as "Lathe"). Remember to set perspective on in the revolution dialog. If you use revolution, you can get well converging light and perspective most easily by placing two 2D shapes at the same vertical axle and revolving them as a group. Also the light is consistent => The stereo image converges well. If perspective is ON in the extrusion dialog, you get different extrusions and that is needed to make the effect strong. If Illustrator's 3D effect can produce your shape, you can group 2 copies of your 2D shape and extrude them as a group. It's easy to make live adjustments as you watch. The convergence is acceptable altough not excellent, when the ellipses have horizontal gradients and the direction of the cylinder surface gradient is perpendicular with the left edge. The gradients are not especially critical. We unite the bottom ellipses with the rectangles, raise the upper ellipses to front and fill the shapes with gradients: make a copy, flip it horizontally (Object > Transform > Reflect > Vertical)įor me it converges well, no matter there's a bounding box still visible in the reflected copy (This fact will be used later).draw ellipses on top and bottom (they snap exactly if you have smart quides and snap to point ON).with the direct selection tool drag the bottom nodes a little to right and closer to each other.The next is an attempt to construct a stereogram of a cylinder manually. NOTE: To create an illusion where objects have some depth, The images should be perspective images as seen by the eyes. ![]() See also, how the apparent size changes because the sight tries to take the distance in to the account when estimating the size.ĭraw it and try to adjust the rotation angle as you watch it. Covering the ghosts make the rest of the screen easily readable and the the illusion of depth doesn't fade as easily.Īs you watch, move one of the rectangles horizontally a little and see how it walks further or closer. If the ghosts at the edges feel too disturbing, you can cover them with your hands as you train to see the effect. If you happen to watch it without crossing eyes and still can see the illusion of depth, the red seems to be the most distant. You should see three red, three green and three blue rectangles In the middle column the apparent distances should be very clear. If you cannot get sharp focusing at distance short enough, zoom out, drag the parts horizontally further away from each other or use about +1.+2 diopter eyeglasses. Then suddenly your head catches the idea and you can watch it more normally. The easiest way is to lean your head back and watch along your nose. ![]() The effect maybe is a little easier to see, if you group the different colors and align them to the same vertical centerline: Use Illustrator or other vector drawing software for easy edits. That article can look out frighteningly complex.įor a soft start simply draw something like this (= a cross-eye stereogram with planar shapes): ![]() There's already a comment from user which refers to a quite comprehensive article. ![]()
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