Perspectives entities have a solid filled background color. The actual color used can be a single color, or vary with the angle of the surface from an imaginary light source. This light source assumes is assumed 135º horizontally, and about 40º inclination and at a great distance. Perspectives can use a fixed color scheme, where each shade is predetermined, or calculate the shades according to the current color when you add an entity. You can choose up to 10 shades of color. Each combination of shades can be saved, and then used in Perspectives Settings.