A process for producing at least one three-dimensional object, comprising: providing a material (7, 17) to be solidified; delivering electromagnetic radiation and/or synergistic stimulation in a pattern or an image to a building region for solidifying said material (7, 17); wherein said delivering of electromagnetic radiation and/or synergistic stimulation is performed selectively to a defined area or volume of said material to be solidified; and controlling an energy density (E 0, E 1, E 3) of electromagnetic radiation and/or synergistic stimulation in a border region of said pattern or image relative to a non-border region of said pattern or image by adjusting an energy intensity of electromagnetic radiation or synergistic stimulation in the border region of said pattern or image relative to the non-border region of said pattern or image to have an energy density different from regions other than said border region, wherein the step of adjusting the energy intensity of electromagnetic radiation or synergistic stimulation in the border region of said pattern or image relative to the non-border region of said pattern or image is dependent on at least one selected from: (a) intensity of electromagnetic radiation and/or synergistic stimulation delivered to said defined area or volume of said material (7, 17) to be solidified; (b) total shape or contour shape of said defined area or volume of said material (7, 17) to be solidified; (c) size of said defined area or volume of said material (7, 17) to be solidified; and (d) material (7, 17) to be solidified. providing a material (7, 17) to be solidified; delivering electromagnetic radiation and/or synergistic stimulation in a pattern or an image to a building region for solidifying said material (7, 17); wherein said delivering of electromagnetic radiation and/or synergistic stimulation is performed selectively to a defined area or volume of said material to be solidified; and controlling an energy density (E 0, E 1, E 3) of electromagnetic radiation and/or synergistic stimulation in a border region of said pattern or image relative to a non-border region of said pattern or image by adjusting an energy intensity of electromagnetic radiation or synergistic stimulation in the border region of said pattern or image relative to the non-border region of said pattern or image to have an energy density different from regions other than said border region, wherein the step of adjusting the energy intensity of electromagnetic radiation or synergistic stimulation in the border region of said pattern or image relative to the non-border region of said pattern or image is dependent on at least one selected from: (a) intensity of electromagnetic radiation and/or synergistic stimulation delivered to said defined area or volume of said material (7, 17) to be solidified; (b) total shape or contour shape of said defined area or volume of said material (7, 17) to be solidified; (c) size of said defined area or volume of said material (7, 17) to be solidified; and (d) material (7, 17) to be solidified. (a) intensity of electromagnetic radiation and/or synergistic stimulation delivered to said defined area or volume of said material (7, 17) to be solidified; (b) total shape or contour shape of said defined area or volume of said material (7, 17) to be solidified; (c) size of said defined area or volume of said material (7, 17) to be solidified; and (d) material (7, 17) to be solidified.