Liu Liang

This sample code refers to cesium-threejs-experiment,but the geometry disappeared when the camera changed. class ThreeJSPrimitive { constructor(options) { this.geometry = null; this.combineGeometry([options.geometryInstance]); var geometry = new THREE.BufferGeometry(); geometry.addAttribute('position2DHigh', new THREE.BufferAttribute(this.geometry.attributes.position2DHigh.values,...

**maptalks's version and what browser you use?** ---- last version **Issue description** ---- maptalks是否支持EPSG:4547投影，现在全国各地都在推进数字中国建设，需要叠加城市建筑物模型的三维展示效果，要求地图、模型数据都是地方坐标系，目前Cesium、mapboxgl都不支持，这个特性是否可以作为maptalks的一个差异化竞争点？ **Please provide a reproduction URL (on any jsfiddle like site)** ----

After seen Volume Raycasting in Cesium(cesiumRenderer.ts),I want to add a CT scan data on Cesiumn, I'm not sure why it's failing.Please give me some suggestions! References:https://cesiumjs.org/demos/VolumeRaycasting/ https://www.willusher.io/webgl/2019/01/13/volume-rendering-with-webgl [Cesium.zip](https://github.com/TNOCS/csWeb/files/3110238/Cesium.zip)