Adobe Illustrator CC 2015 - Manual (Page 127)

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Drawing
Last updated 6/5/2015
Viewing Angle Imagine a cube in such an orientation that no face is parallel to the picture plane (in this case the
computer screen). Viewing Angle is the angle which the right face of this imaginary cube makes with the picture plane.
Therefore, the viewing angle determines the positions of the left and right vanishing points from the observer. A
viewing angle of 45° implies that the two vanishing points are equidistant from the line of vision of the observer. If the
viewing angle is greater than 45°, then the right vanishing point is closer to and the left vanishing point is farther away
from the line of vision and vice versa.
Viewing Distance Distance between the observer and the scene.
Horizon Height Specify the horizon height (observer’s eye level) for the preset. The height of the horizon line from the
ground level is displayed in the smart guide readout.
Third Vanishing Point This option is enabled when you select the three-point perspective. You can specify the x and y
coordinates for the preset in the X and Y boxes.
To change the colors for the left, right, and horizontal grids, select the color from the Left Grid, Right Grid, and
Horizontal Grid drop-down lists. You can also select a custom color from using the Color Selector as well.
Use the Opacity slider, to change the opacity of the grid.
To save the grid as a preset, click the Save Preset button.
Edit, delete, import, and export grid presets
To edit grid presets, click Edit > Perspective Grid Presets. In the Perspective Grid Presets dialog box, select the preset
to edit and click Edit.