== Procedural Pompeii ==== About Procedural Pompeii is a test case for the CityEngine modeling software and has been created as environment for the European Project [[http://www.cyberwalk-project.org|Cyberwalk]], where a visitor can walk around in the reconstructed ancient Pompeii in **any** direction on a mechanical treadmill. You can read more about Cyberwalk in the press: [[http://news.bbc.co.uk/2/hi/technology/7346325.stm|BBC]] and [[http://www.sf.tv/sf1/einstein/index.php|Swiss Television]]. {{public:publications:cover_procedural_pompeii.png?720|Frontispiece}} \\ ==== Reconstructing Pompeii with the CityEngine The creation of 3D models of ancient sites has often been focused on their major monuments only. This is logical, given the high costs of traditional 3D modeling. Thus, to efficiently reconstruct entire sites like cities, a large number of domestic buildings and workshops need to be generated automatically. Their appearance should follow the aesthetic and statutory architectural rules of the corresponding epoch. From various GIS (Geographical Information Systems) data given as input, such as population density, land usage, street network and building footprints, the CityEngine assigns type and style of the buildings to its footprints and calls the corresponding shape grammar rules to efficiently create detailed large-scale models. The shape grammar rules which are responsible for the creation of the actual building geometries are manually derived from photos and plans of remaining buildings, archaeological excavation data, and (historical) paintings. The model has been completely generated with the CityEngine prototype. \\ ==== Model Creation Approximation to Reality: * The footprints of section 6 are based on archaeological input data. For the rest of the model, only the street blocks are based on real surviving/excavation data i.e. the subdivision into building lots has been generated procedurally. Note that we provide also the areas which are not excavated yet. * In the archaeological data we used, it is often unclear how one building can be defined: on the one hand a building may consist just of one room, on the other hand, large villa structures may span a whole street block. We solved this issue by assigning each footprint a unique building ID. * Besides the temple of Jupiter, the building geometries on top of the footprint are not based on excavation data i.e. no surviving structures are included in the model. * The temple of Jupiter and the forum are the only monuments we provide. These two models have been generated with the CityEngine too. * In the provided model the terrain is flat. In reality, the site of Pompeii was not not completely flat - unfortunately we did not have access to a DTM. \\ ==== Level of Details We provide four levels of detail (LoD) for each building. The LoDs are described in the following: ====== LoD 0 - Mass Model * Can be used as proxy for navigation and camera setup * Untextured {{public:models:procedural_pompeii:description_massmodel.jpg?720}} ====== LoD 1 - Low Detail * Simplified, but can still be used for walk-troughs * No interiors {{public:models:procedural_pompeii:description_lod1.jpg?720}} ====== LoD 2 - Standard * Reasonable polygon count * Perfectly suitable for high-quality walk-throughs * Although almost no furniture is included, the interior structures of the buildings can be explored {{public:models:procedural_pompeii:description_lod2.jpg?720}} ====== LoD 3 - High Detail (available on request due to massive file sizes) * Extremely high polygon count * Includes projecting stones on the walls and roof tiles * Suitable for high-quality renderings and as massive model test set for academia {{public:models:procedural_pompeii:description_lod3.jpg?720}} \\ ==== Model Download //Note:// The model has been created with the CityEngine **prototype**. An updated, more detailed version of the whole model will be available soon after the commercial release of the CityEngine. //Models:// We subdivided the whole city into parts. One part is publicly available as example. In addition, the temple of Jupiter and the forum are provided. //File organisation:// The file archives (one per LOD per part) contain **for each building one file**. Hence, to import the city in a modeling or rendering application, the import procedure can be scripted. //Textures:// The applied **textures can be downloaded here:** {{public:models:procedural_pompeii:procedural_pompeii_textures.v3.tar.bz2}}. In case of Wavefront Obj, extract the textures into the folder with the mtl files. //Shader:// Our models use two textures and a solid diffuse color which **all three are multiplied by a shader** to get the final color. With the Obj/Mtl material-model (diffuse/ambient/specular/..) this cannot be exported in a way compatible with e.g. Maya, since most of these commercial packages cannot read a diffuse solid color and a diffuse texture at once from mtl. Hence, you might need to script (1) your own mtl importer to get the right materials, or (2) reassignments in the shader networks. We use the following convention in the Mtl files: * Diffuse color in the "Ka" field * Main color texture in the "map_Kd" field * Bump map in the bump channel * Dirtmap texture in the "map_Ks" field ====== City Section 6 ||{{public:models:procedural_pompeii:pompeii_sat_part.01.jpg?200}}|{{filelist>:public:models:procedural_pompeii:part_1:*&style=table&tableheader=1&tableshowdate=1&tableshowsize=1}}|| ====== Forum and Temple of Jupiter ||{{public:models:procedural_pompeii:pompeii_sat_part.07.jpg?200}}|{{filelist>:public:models:procedural_pompeii:part_7_temple_forum:*&style=table&tableheader=1&tableshowdate=1&tableshowsize=1}}|| **Terms of Use:** Use of the models is limited to personal, non-commercial and non-military use. The material may be published in academic papers or in press articles after Procedural Inc. granted permission and on condition that the models are credited and the [[public:publications:modeling_buildings|SIGGRAPH 2006 paper]] is referenced. Please write an email to if you have further questions or want to purchase a model for commercial use. **Copyright:** All material copyrighted by ©2008 Procedural Inc. You may not mirror, license, or sell any material without permission. See [[public:Terms of Use]] for detailed information. Please note that our models are watermarked (not visible to the naked eye, but withstand simplification, noise addition, cropping etc). **Disclaimer:** We do not warrant or assume any legal liability or responsibility for the accuracy, completeness, or usefulness of any model disclosed. See [[public:Terms of Use]] for detailed information.