1. A method for calculating vision obstruction, comprising the steps of: providing a data file having a virtual environment; providing at least one viewing area in said virtual environment to be used with an interface; projecting at least one rendered image onto said at least one viewing area; designating one of a plurality of colors to represent a plurality of objects which are visible in said at least one rendered image; designating one of said plurality of colors to represent a plurality of objects which are obstructed in said at least one rendered image; calculating the visual mass units of said plurality of objects which are visible and said a plurality of objects which are obstructed; and displaying the visual mass unit data.