节点优化提升加载面数据

// 简化边界数据 function simplifyPolygon(positions, tolerance) { // 实现简化算法或使用第三方库 return simplifiedPositions; } // 使用Primitive API（更节省内存） function createOptimizedPolygon(positions) { const geometry = Cesium.PolygonGeometry.fromPositions({ positions: positions, vertexFormat: Cesium.PerInstanceColorAppearance.VERTEX_FORMAT }); const instance = new Cesium.GeometryInstance({ geometry: geometry, attributes: { color: Cesium.ColorGeometryInstanceAttribute.fromColor( Cesium.Color.fromCssColorString('#ff0000').withAlpha(0.5) ) } }); return new Cesium.Primitive({ geometryInstances: instance, appearance: new Cesium.PerInstanceColorAppearance({ translucent: true, closed: true }), asynchronous: false }); }