1. A method for generating a bitmap used to guide the projection of electromagnetic radiation from a rastered image forming unit unto the surface of a curable resign, wherein the image forming unit has an image forming matrix, the method comprising: defining a coordinate system; providing a vector path defining an interior area, wherein the interior area of the vector path corresponds to an inner contour of the object to be formed from the curable resin; defining a bitmap comprising a plurality of bitmap grid elements, wherein each bitmap grid element corresponds to a location in the image forming matrix; superimposing the bitmap onto the coordinate system to define a first bitmap position relative to the coordinate system; superimposing the vector path on the coordinate system; calculating a first degree of overlap between each bitmap grid element and the interior area, wherein the first degree of overlap for each grid element corresponds to the area of each bitmap grid element occupied by a portion of the interior area when the bitmap is in the first bitmap position relative to the coordinate system; shifting the bitmap to a second bitmap position relative to the coordinate system; and calculating a second degree of overlap between each bitmap grid element and the interior area, wherein the second degree of overlap corresponds to the area of each bitmap grid element occupied by a portion of the interior area when the bitmap is in the second bitmap position relative to the coordinate system.