This Project is for the course building information modeling 653 Texas A&M University. For this project we had to use Autodesk Revit to create a parametric surface and a pattern base envelope. I chose the Allianz Arena stadium as a case study. the stadium is located in Munich, Bavaria, Germany with 75000 capacity. known for its exterior inflated ETFE plastic panels and it is the first stadium in the world with a full color changing exterior which is the final objective of the project later on to make this happen parasitically by using dynamo. my design intent was to use plan view to create a path then sweep the section of the surface through it. because there was not AutoCAD documents for the stadium I used google earth and some photos with general shape of the plan and the section of the stadium to find relation between stadium parameters for instance relation between the length and width of the stadium I imported the photos to AutoCAD