In the paper a process of designing and assembling complicated steel structure is described. The object is a glass roof over the railroad terminal. The object’s body makes it impossible to assemble elements of the structure on the building site just having a structural 2D drawing. It was essential to create visual animation illustrating the chronology, in what way the particular elements of the structure should be assembled to achieve the effect assumed by the architects. However, the architectonic form of the whole object was so interesting and valuable that it is worth to destine investment means and time to achieve the desired aim.