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

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;

}