Cesium实战(十二)使用Primitive替代entity

11 thoughts to “Cesium实战(十二)使用Primitive替代entity”

1. 大神，请教一下，我照您的写primitive管线，报错 Cannot read property ‘attributes’ of undefined是怎么回事呀，谢谢呀

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   1. 定位一下错误，或者看你的attributes是不是写错了啥的，你这么描述，不太知道是什么回事。。。

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   2. 这个问题解决了吗？我也遇到了

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2. 当我改成动态渲染时会报这个错：The appearance requires vertex shader attribute input ‘prevPosition2DHigh’, which was not computed as part of the Geometry. Use the appearance’s vertexFormat property when constructing the geometry.大神，帮帮我吧

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   1. API里面查找一个vetexformat的类型，换成别的试一试

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      1. function creatgxPolylinePrimit(positions, linewidth, linecolor, img, speed, isClose) {
         var cvs = img;

         var pl = new Cesium.PolylineVolumeGeometry({
         polylinePositions: positions,
         shapePositions: computeCircle(linewidth),
         vertexFormat: Cesium.VertexFormat.POSITION_ONLY
         });
         var ins = new Cesium.GeometryInstance({
         geometry: Cesium.PolylineVolumeGeometry.createGeometry(pl),

         attributes: {
         color: Cesium.ColorGeometryInstanceAttribute.fromColor(Cesium.Color.RED),
         }
         })
         // var ins = GeometryIns(pl);
         var linesInstances = [];
         linesInstances.push(ins);

         var cesiumColor = Cesium.Color.fromCssColorString(linecolor);
         var appc = new Cesium.PolylineMaterialAppearance({
         material: new Cesium.Material({
         fabric: {
         uniforms: {
         image: cvs,
         animationSpeed: speed,
         color: cesiumColor
         },
         source: “czm_material czm_getMaterial(czm_materialInput materialInput) { \n\
         czm_material material = czm_getDefaultMaterial(materialInput);\n\
         vec2 st = materialInput.st;\n\
         float time = czm_frameNumber * animationSpeed;\n\
         vec4 colorImage = texture2D(image,vec2(fract(st.s – time), st.t));\n\
         material.alpha = colorImage.a;\n\
         material.diffuse = colorImage.rgb;\n\
         return material;\n\
         } \n”,
         // aboveGround: true,

         },
         }),
         })
         // var curPrimitive = primitv(linesInstances, appc);
         var curPrimitive = new Cesium.Primitive({
         geometryInstances: linesInstances,
         appearance: appc,
         asynchronous: false
         });
         curPrimitive = window.CesiumViewer.scene.primitives.add(curPrimitive);
         return curPrimitive;

         }

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         1. 我把所有的vertexFormat都试了一次，都报那个错，这是我的代码，大神麻烦您帮我看看吧，谢谢呀

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            1. cesium1.66 可以运行，代码和视频发你邮箱了

   2. 你好 同样的问题 请问你最后怎么解决的 感谢帮助！！

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3. 去掉vertexFormat就没报错了

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4. 你好，使用primitive 画几何体，按照你的参数
   vertexFormat : Cesium.VertexFormat.POSITION_AND_NORMAL

   appearance : new Cesium.PerInstanceColorAppearance({
   translucent : false,
   closed : true
   })
   看起来还是没有立体感，这个要怎么解决呢

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