Perspective Methods

Placing right angles to vanishing points

1. Place two Vanishing Points on the Horizon line.
2. Draw semicircle between vanishing points either above or (typically) below the horizon line.
3. Pick a point anywhere on the circle to use as the Station Point.
4. Two lines drawn from the two vanishing points to the Station Point will always be perpedicular to each other.

Placing measuring points

Measuring Points translate distances that are parrallel to the picture plane to distances that recede in perspective.

1. Place the Station Point as described in Placing right angles to vanishing points
2. Draw a segment of a circle with a radius from the Left Vanishing Point to the Station Point.
3. Draw the segment of the circle so that it intersects the Horizon Line. This intersection is the Right Measuring Point.
   (Basically this is placing a point on the horizon the same distance from the left vanishing point as the station point is from the left vanishing point. )
4. Repeat the process for the Left Measuring Point.
   1. Draw a segment of a circle with a radius from the Right Vanishing Point to the Station Point.
   2. Have the cirlce segment intersect the Horizon Line. This intersection is the Left Measuring Point.