Patent ID: 8454880

Claim:
A method for layerwise production of a tangible object, the method comprising: providing a liquid reservoir containing a liquid; and repeatedly performing method cycles, each method cycle comprising the steps of: solidifying a predetermined area of an uppermost liquid layer of the liquid in the reservoir, so as to obtain a solid layer of the tangible object, the solid layer thus having a predetermined shape; and creating, above, parallel and adjacent to the solid layer, a successive uppermost liquid layer of the liquid for carrying out a successive such method cycle for similar solidifying a predetermined area of the successive liquid layer, so as to obtain a successive such solid layer adhered to the solid layer; wherein, for at least one of said method cycles, said creating of the successive liquid layer is carried out by spraying such liquid onto upper parts of the contents in the reservoir; characterized in that after at least part of such a successive uppermost liquid layer has been created in such a method cycle and before the solidifying is carried out in a consecutive such method cycle, a height distribution over at least part of the surface of the created uppermost liquid layer is measured by means of a measuring device; and based on the measured height distribution, the solidifying is carried out to compensate for unflatness of the measured height distribution.