2-point perspective
Through 2-point perspective, you can create pleasantly realistic objects close to eye-level. 2-point perspective is particularly useful for objects that cross the horizon, including drawings of interior or exterior architectural spaces. All faces recede toward one of the movable vanishing points. To create or project artwork in 2-point projection, click 2 Point in the Perspective Document palette. Slide the horizon slider to move the vanishing points lower or higher on the document. The horizon corresponds to the viewer's eye level. Slide the H Distort slider to adjust the distance between the vanishing points. (VP separation) A greater distance will result in less distortion or 'forced perspective' of your Perspective artwork. For numeric control of actual spacing between vanishing points, enter a value in the VP separation field.
3-point perspective
Through 3-point perspective, you can construct objects with more realistic proportions than any other method. You can also create extremely dramatic effects by adjusting the location of the third vanishing point. The third vanishing point represents your vertical view limits. To create or project artwork in 3-point projection, click 3 Point in the Perspective Document palette. Slide the horizon slider to move the vanishing points lower or higher on the document. The horizon corresponds to the viewer's eye level. Slide the H Distort slider to adjust the distance between the vanishing points. (VP separation) A greater distance will result in less distortion or 'forced perspective' of your Perspective artwork. For vertical vanishing point control, move the V Distort. Slide toward Bottom to create a 'bird's eye view' or slide toward Top to create a 'worm's eye view.' To shift the vertical vanishing point to the left or right, move the last slider toward Left or Right. These 3-point adjustments combine to create a variety of rotated, floating, or distant illusions.