How to draw a house in perspective

This video goes over how to draw a house in one point perspective.

The horizon is where the sky meets the earth. The dot I placed on the horizon is the vanishing point. You can move the horizon up or down and the vanishing point left or right. In three point perspective, the three vanishing points ( two on the horizon, and one below or above the horizon ) form a triangle shape. Any object you wish to render in 3 point perspective must fall inside this triangle. If you try and render an object outside the triangle, you'll end up with distortion.

Tools:
Photoshop
Camtasia Studio
Mouse