cesium

问题 I am using Cesiumjs to create a polygon which is moving around an area. To show its movement I tried to create a sampledProperty of PolygonHierarchy . Each sample is an array of Cartesian3 positions (three endpoints of my polygon at each time step). I need to know the type of the property that I am using in sampledProperty as it is mentioned in Cesiumjs website: Cesiumjs.org/SampledProperty. But I don't know how to define it and I couldn't find any explanation on the website on how to

问题 I can normally call a method that is inside the html of an iframe using this approach: document.getElementById("frame_id").contentWindow.method_in_frame(); I can also call methods outside the iframe using the parent approach: onclick="parent.method_outside_frame(); But if my iframe is holding an instance of the Cesium map this does not work. Does cesium having something that stops this from happening? Is there a way to override it? 回答1: Found the answer. You need to change the default

问题 I can normally call a method that is inside the html of an iframe using this approach: document.getElementById("frame_id").contentWindow.method_in_frame(); I can also call methods outside the iframe using the parent approach: onclick="parent.method_outside_frame(); But if my iframe is holding an instance of the Cesium map this does not work. Does cesium having something that stops this from happening? Is there a way to override it? 回答1: Found the answer. You need to change the default

问题 I have implemented a 3d model (cesium air) aircraft to move along a path. Its position is being changed based on time and the detailed data is available in the czml file under position attribute. However, I am not able to change the orientation of the aircraft along with path. The aircraft flies through the path but its heading , pitch and roll are constant. It does not pitch up with increase in height etc. How to implement the attitude changes using orientation attribute in the czml file or

问题 I want to set the default view/home location for a cesium app. I don't just want to flyTo the location once; I want the location set as the default/home - so that it can be used elsewhere in the app - e.g. in the HomeButton Widget. I've tried setting the Camera.DEFAULT_VIEW_RECTANGLE (docs here) like this: var extent = Cesium.Rectangle.fromDegrees(117.940573,-29.808406,118.313421,-29.468825); viewer.camera.DEFAULT_VIEW_RECTANGLE = extent; But it doesn't work.. For completeness, here's how I'm

问题 This question is related to these two: Cesium how to scale a polygon to match Lat-Lon positions while zoom-in/zoom-out Cesium - using camera to scale a polygon to match Lat-Lon positions while zoom-in/zoom-out The sample code I am following to get lat-lon-alt positions from the camera is located in the gold standard that appears to be baked into the existing camera controller. With this code I can retrieve lat-lon-alt positions from the distance of the camera to get values that are almost

问题 I would like to be able to create a div and give it a height, width, and class. Then add the div to a Cesium map as a billboard. I can create billboards with images and labels and also found this link about how to use an svg, but I am having trouble figuring out how to make the billboard contain dynamically produced html. The project this is in uses class names to apply font icons to divs. Is there a way to insert the html into a billboard? Or is there another class that would be better

问题 I would like to initialize cesium so that the map is centered on some specific coordinates instead of the default ones. I have the following initialization code: var map = new Cesium.CesiumWidget('map-js'); map.centralBody.terrainProvider = new Cesium.CesiumTerrainProvider({ url : 'http://cesiumjs.org/smallterrain' }); Usually, with other mapping libraries, I would set the center on initialization, eg on mapbox: map = L.mapbox.map('map-js', 'api-key').setView([42.12, 12.45], 9); How to do

问题 I'm interested in using Cesium to build a 3D Earth with custom tiles, but as per the "get started" instructions here, it seems as though you have to download a massive 30mb directory and include the whole thing in your project to have it run correctly. Is this true? Can I not just include Cesium.js and get running like that? I don't need 80% of the UI elements they include anyways. At the end of the "get started" tutorial, they seem to indicate that all you need to get running are these bits:

问题 I'm trying to put a point at the top of Mount Everest in Cesium. My most likely candidate as of last night was the code I borrowed to do geodetic to ecef conversion (from PySatel.coord). Upon review this morning, it appears to be correct: a = 6378.137 b = 6356.7523142 esq = 6.69437999014 * 0.001 e1sq = 6.73949674228 * 0.001 f = 1 / 298.257223563 def geodetic2ecef(lat, lon, alt): """Convert geodetic coordinates to ECEF. Units are degrees and kilometers. """ lat, lon = radians(lat), radians(lon