Patent ID: 8185360

Claim:
A computer aided design system for determining the clear view area of a transparency, comprising: a source of data representing the shape and location of the transparency; a source of data representing head orientation; and a processor that generates output data representing the clear view area of the transparency in response to the data representing the shape and location of the transparency and the data representing head orientation; wherein the output data representing the clear view area of the transparency is a two dimensional angle vision graph representing left and right viewing angles and up and down viewing angles for both a left eye position and a right eye position with respect to the eye reference point, and wherein the processor: rotates the left eye position and the right eye position about a pivot point until the pivot point, the left eye position, and the right eye position, the reference point, and a point on an object curve all lie in a single vertical plane; and creates a sight ray that extends from at least one of the left eye position or the right eye position through a target point and through the transparency.