In this dissertation I intend to document how the integration of 3D modelling into the urban development/planning process allows a greater level of detail in the visualisation of planned building projects. Consistent visualisations can be produced of competition entries, for example the terrain and immediate site information. As an example of this process, I have chosen an unsuccessful competition entry by Charles Rennie Mackintosh as the basis of a model. An unrealised design which can be created in 3D to highlight some of the benfits 3D modelling can give to architects.