Production of three-dimensional objects

Abstract

A method for producing a three-dimensional object having selected elements which are colored differently than other elements of the object comprising the steps of: (a) providing a film of a photohardenable composition containing a photoresponsive agent; (b) irradiating the film in a cross-sectional pattern of the object to be formed; (c) selectively irradiating one or more portions of the cross-sectional pattern corresponding to the selected elements which are desired to be colored differently with radiation which activates the photoresponsive agent, the photoresponsive agent thereby producing color in or removing color from the selected irradiated portions of the cross-sectional pattern; (d) repeating the steps a, b and c to form successive adjacent cross-sectional patterns of the object; and (e) integrating the cross-sectional patterns together to provide the object.

Dependencies are inferred from the claim text.