Method for digital analytic correction of photoresponsive material reactivity in additive manufacturing

A system for producing a three-dimensional object from a photoresponsive material, the system comprising:

• a first projection unit capable of emitting controlled spatial patterns of light;
• a means for computing a sequence of projections describing the three-dimensional object to be formed along different orientation angles, different layers, or different combinations of orientation angles and layers of said object;
• said projections being used to define said controlled patterns of light, wherein said means is configured to provide a compensation of an expected light intensity of said projections for any deviations of an alteration rate in said photoresponsive material caused by auto-acceleration or auto-deceleration, so as to obtain a constant alteration rate throughout said photoresponsive material, wherein said compensation is computed from a predicted three-dimensional light dose distribution in the photoresponsive material and a function describing an alteration response of the photoresponsive material to light dose, wherein said computation of said compensation comprises a convolution or deconvolution of said predicted three-dimensional light dose distribution in the photoresponsive material with a function describing an elementary auto-acceleration or auto-deceleration alteration response of the photoresponsive material to an elementary light dose;
• a vessel, said vessel intended to contain a volume of photoresponsive material, and said vessel and the intended photoresponsive material defining a build volume;
• wherein the first projection unit is arranged in the system to irradiate said build volume with said controlled patterns of light;
• and
• a direction varying means, or a position varying means, or a means able to vary both position and direction, operatively associated with said first projection unit, for controllably varying a direction or position of incidence of said patterns of light relative to said build volume, either by rotating and/or moving the build volume within the field of illumination of the first projection unit, or by rotating and/or moving the first projection unit relative to the build volume, or a combination of both of these rotations and/or motions, and for executing the computed sequence of projections by irradiating the photoresponsive material with the controlled patterns of light from directions and positions corresponding to the different orientation angles and positions thereby creating a three-dimensional distribution of alterations of the photoresponsive material, and creating the three-dimensional object.