A method of producing an object from a polymer powder using a laser sintering system comprising the steps of: (i) providing a build data of an object, the build data comprising a plurality of cross-section patterns according to a geometry description data of the object, each cross-section pattern comprising data specifying select points in the cross-section for solidification and each of the select points in a cross-section pattern selected for solidification having a unique position in the cross-section pattern, the plurality of cross-section patterns including a cross-section pattern for L 0, a cross-section pattern for a layer L -1, and a cross-section pattern for a layer L -2 wherein the layer L -1 is a layer below the layer L 0, and the layer L -2 is a layer below the layer L -1, (ii) applying a layer L 0 (540; 640) of a polymer powder on a bed of a laser sintering system, (iii) solidifying select points of the polymer powder of layer L 0 (540; 640) by a heat energy introduced by electromagnetic radiation according to the cross-section pattern assigned to layer L 0 (540; 640); and characterised by (iv) adjusting the heat energy introduced by electromagnetic radiation to solidify a select point at a first position (x, y) in the layer L 0 (540; 640) using a controller programmed to make the adjustment based on whether the build data specifies solidification of a point at the first x-y position in the cross-section pattern for the layer L -1 and the cross section pattern for the layer L -2, wherein the adjustment is made to inhibit unwanted fusion between the first x-y position in the powder layer L 0 and the first x-y position in the layer L -1. (i) providing a build data of an object, the build data comprising a plurality of cross-section patterns according to a geometry description data of the object, each cross-section pattern comprising data specifying select points in the cross-section for solidification and each of the select points in a cross-section pattern selected for solidification having a unique position in the cross-section pattern, the plurality of cross-section patterns including a cross-section pattern for L 0, a cross-section pattern for a layer L -1, and a cross-section pattern for a layer L -2 wherein the layer L -1 is a layer below the layer L 0, and the layer L -2 is a layer below the layer L -1, (ii) applying a layer L 0 (540; 640) of a polymer powder on a bed of a laser sintering system, (iii) solidifying select points of the polymer powder of layer L 0 (540; 640) by a heat energy introduced by electromagnetic radiation according to the cross-section pattern assigned to layer L 0 (540; 640); and characterised by (iv) adjusting the heat energy introduced by electromagnetic radiation to solidify a select point at a first position (x, y) in the layer L 0 (540; 640) using a controller programmed to make the adjustment based on whether the build data specifies solidification of a point at the first x-y position in the cross-section pattern for the layer L -1 and the cross section pattern for the layer L -2, wherein the adjustment is made to inhibit unwanted fusion between the first x-y position in the powder layer L 0 and the first x-y position in the layer L -1.