Important Notice

All our models are in OpenInventor format. In general we postprocessed all our models with triangle stripping, mode sorting and database flattening. We use a triangle stripper published by Xiang, Held, Mitchell and the one from OpenInventor. We also tried to split all objects into reasonably sized objects (e.g., 20 x 20 meter) to be able to implement efficient occlusion culling. So most files are a list of these smaller objects. There is a tradeoff between efficient rendering and occlusion culling. However, for modern hardware our objects are very likely too small.

Models 2000

2000 Version This version of the city was used in most of the occlusion culling work. It represents an area of about 3 x 3 km in Vienna. The complete model: [download]. You will notice that several buildings are slightly intersecting.

The ground meshes: The ground is a delauney triangulation of free space. Additionally, we inserted all points on a regular grid in the triangulation. There are versions for a sampling density of 10, 15, 20, 25, 40 and 50. Then the mesh is passed to a Triangle Stripper. The ground is subdivided into patches. There are different versions of the ground mesh for (1) a mesh split into 50 x 50 meter areas or (2) one large mesh.

The buildings: There are flat versions of the buildings and a detailed version. The detailed version is split into 9 areas to make file sizes smaller.

Models 2001

2001 Version This version of the city was used in the 2001 point-based impostor paper. It represents an area of about 2 x 2 km in Vienna with textures of Grenoble. Building block footprints were digitized from an aerial image. This is realistic for views on the ground, but an overview of the model does not look very nice. See the images page for screenshots of this model.
The model consists of roads, sidewalks, buildings, roofs and textures.

buidlings: detailed buildings [download]

streets: sidewalks, roads (and flat buildings). The geometry is obtained through triangulation. There are two versions depending on how many additional points are inserted. There is a version for a 30 meter raster and one for a 50 meter raster.[download]

roofs: [download]

textures: [download]

Models 2003

2003 Version This version of the city is the first major modeling effort for urban environments in our project. This will be a while .... (maybe a year)