CityEngine与ArcGIS对栅格数据的要求情况.docxVIP

CityEngine与ArcGIS对栅格数据的要求情况为CityEngine选择合适的栅格数据或者纹理，提供一些帮助，原文如下：----------------------------------------------------------------------------------------------------------textures / raster files : concepts in CityEngine / ArcGISHi,Quite a few new customers and people evaluating CityEngine who are working in the field of GIS ask about how CityEngine handles raster files or basemaps and what the best practices are concerning file resolutions.Since CityEngine works ( from a technology-POV ) very similar as many other pure 3d applications (CityEngine is a 3d Modelling Application), I wanted to point out a few differences between CityEngine and ArcGIS :ArcGIS-users call bitmap files raster?files due to their grid-based nature. People usually working with 3d applications call them textures. Its the same thing.ArcGIS has technologies embedded which dynamically load only the part of a dataset which iscurrently visible on screen. Thus, with this technology HUGE raster datasets ( 1GB) can easily be displayed.CityEngine does NOT have such a streaming service, thus raster files / textures should be prepared with some basic knowledge how they shall be used in a CityEngine project.Important things to know :1]?Arc GIS basemaps can not directly be loaded in CityEngine as a layer. The user must export the specific area of interest (extent) as a texture to be used within CityEngine.2]?To be able to work with textures, all the texturesmust?reside within the opened project, usually in the assets folder general textures, respectively the maps folder for map-/basemap - textures (or a subdirectory).3]?CityEngine is a 3d application which uses a technology called OpenGL to display the 3d models (and the scene). Displaying 3d graphics this way uses the computersgraphics card?. For this, all texturesare fully loaded?in thatgraphics cards memory. [Please note that the computer has main memory, which is usually called RAM. A graphics card has its own RAM, often called Video RAM. ]4]?Since the a