CGIs of new property developments are normally based on the architectural drawings - floorplans, elevations, site plans. If your architect has created a 3D model file (eg in SketchUp or Revit), this is a useful starting point for your 3D visualisation team but is not essential. Additional drawings such as sections, M&E plans, kitchen and bathroom plans, topographical surveys and landscaping plans may also be requested. A full and detailed specification will be required for external materials and landscaping. For internal CGI, a specification for internal materials, fixtures and fittings is required so that your 3D visualiser can ensure the CGI reflects exactly what you are intending to build. Interior designs can be provided in the form of mood boards or pinterest boards, or you can request that your 3D visualiser comes up with the interior designs to suit the aspirations of your ideal buyer. In most cases, your 3D visualiser will be happy to work with you to understand your vision, if there are any gaps in the drawings, plans or reference materials that you have available.