| The 3D symmetric curves can be rotated by dragging the mouse. |
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Demo 8.
Two different 3D symmetric interpretations produced from the same 2D curve in Figure 13.
(a) The slant and the tilt of the symmetry plane of the 3D interpretation were set to 40 deg and 0 deg, respectively. Each of the two symmetric halves of the 3D curve is planar.
(b) The slant and the tilt of the symmetry plane were set to 40 deg and -25 deg, respectively. Neither of the two symmetric halves of the 3D curve is planar. The original image does not look like a 2D projection of this 3D symmetric interpretation. The role of planarity of contours in visual interpretation is discussed in Discussion.
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