The word anaglyph means carved in relief. This is one of the most commonly used techniques in 3D viewing because its rendering and viewing is inexpensive.
The wavelengths corresponding to red in the visible light spectrum are eliminated by using a red filter, so that green or blue are seen as black. Similarly, using a green, blue or cyan filter, wavelengths of the filter’s colors are eliminated, thereby making it possible to view red as black.
Using these two filters allows one to merge two images –a red image and a blue image– on the same sheet of paper, so that when they are observed through the filters, they are separated, and each is seen by one eye. Given that there is a small displacement between the two images, a stereoscopic effect is generated enabling one to view relief features. The image is seen in black and white.
The image of the left eye is drawn in red and the image of the right eye in cyan or green. The glasses should be equipped with red filters for the left eye, and cyan or green filters for the right eye. This same configuration is valid for projected images or images on a computer screen.
The dialog box requests the following data:
Start height of contour. The minimum height from which the displacement will be applied.
Interval between . Interval between the contour lines represented on the drawing.
Height Interval. Height displacement difference. It controls the perception of relief.
Output Scale. Scale in which the plan will be drawn.
Once the dialog box has been validated, the program requests a series of objects to which the algorithm will be applied. The result is generated on the ANAGLYPH_LEFT layer for the left eye and on the ANAGLYPH_RIGHT layer for the right eye. In order to obtain the best results, trials should be done with the colors.
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