1. A computer-implemented process for providing a vector image of a view of a modelled object with removed hidden lines, comprising the steps of providing ( 22 ) a bitmap image of the view of the modelled object, with removed hidden lines; for a line of the vector image, providing ( 26 ) a raster of the line in the view, comparing ( 30 - 36 ) pixels of the raster with pixels of the bitmap image and according to the results of the comparison, determining ( 38 ) a visible part of the line.