Patent ID: 7831328

Claim:
A method for producing a three-dimensional object by solidification of a material solidifiable under the action of electromagnetic radiation by means of energy input via an imaging unit comprising a predetermined number of discrete imaging elements (pixels), comprising the steps of: a) providing a two-dimensional data set generated from a three-dimensional volume completely or partially enclosing a three-dimensional model of at least a part of the three-dimensional object to be produced, wherein the two-dimensional data set is generated by a process including: superimposing a grid raster over the three-dimensional volume completely or partially enclosing the three-dimensional model, determining transition information, the transition information comprising entry information and exit information for the three-dimensional model, wherein the entry information is, defined by transitions from the outside to the inside of the three-dimensional model, and the exit information is defined by transitions from the inside to the outside of the three-dimensional model, saving the transition information in a two-dimensional data set; and b) performing solidification with exposure using bitmap masks generated using the two-dimensional data set provided in step a).