Method of manufacturing a product implemented by a system for manufacturing by stacking layers of material, said system comprising - a lighting device comprising a light source and a mask configured to transmit or to block the light emitted by the light source according to a display pattern to create a projection image, said mask comprising an array of pixels able to take a passing state and a blocking state, the passing state resulting in a transmission of light towards the corresponding point of the projection image, the blocking state resulting in an absence of light transmission towards the corresponding point of the projection image, and the display pattern corresponding to the distribution of the states of said pixels - a receptacle arranged to contain a layer of material having a working surface exposed to the projection image emitted by the lighting device, - movement means for moving the projection image over the working surface in a scrolling direction, - a storage memory comprising at least one reference pattern (51, 52, 61, 62) from which is determined the display pattern, the reference pattern comprising a sequence of pixel states, in which the display pattern corresponds to a used part of the reference pattern, and the display pattern is updated during the movement of the projection image in the scrolling direction progressively with said movement of the projection image by a shifting of the used part of the reference pattern, the storage memory comprising a plurality of reference patterns, and the reference pattern from which is determined the display pattern of the mask is selected from among the plurality of reference patterns according to criteria relative to the movement of the projection image in the scrolling direction and according to temporal criteria, in which the reference pattern from which is determined the display pattern of the mask is selected from among the plurality of reference patterns at least according to temporal criteria, in which the display pattern is modified several times in the absence of movement of the projection image, characterized in that the movement profile of the projection image over the working surface in the scrolling direction comprises an initial part and a final part during which the projection image is fixed on the working surface, and in that the display pattern has an obturated zone of which the distribution over said mask: - regresses in the direction of scrolling in the initial part, and/or - progresses in the scrolling direction in the final part. - a lighting device comprising a light source and a mask configured to transmit or to block the light emitted by the light source according to a display pattern to create a projection image, said mask comprising an array of pixels able to take a passing state and a blocking state, the passing state resulting in a transmission of light towards the corresponding point of the projection image, the blocking state resulting in an absence of light transmission towards the corresponding point of the projection image, and the display pattern corresponding to the distribution of the states of said pixels - a receptacle arranged to contain a layer of material having a working surface exposed to the projection image emitted by the lighting device, - movement means for moving the projection image over the working surface in a scrolling direction, - a storage memory comprising at least one reference pattern (51, 52, 61, 62) from which is determined the display pattern, the reference pattern comprising a sequence of pixel states, - regresses in the direction of scrolling in the initial part, and/or - progresses in the scrolling direction in the final part.