五年以上倾斜摄影osgb模型转3dtiles如何在mars3d加载

方案一：

// 兼容1.50 （2018-10-01)版本更改了名称，造成部分3dtiles可能会出现加载不上导致渲染停止的错误。
// 错误说明为：RuntimeError: Unsupported glTF Extension: KHR_technique_webgl
// 原因：KHR_technique_webgl扩展新版Cesium已经不支持的缘故，需要升级一下gltf数据，使用KHR_techniques_webgl扩展即可(注意多了一个s)。
try {var fixGltf = function (gltf) {if (!gltf.extensionsUsed || !gltf.extensionsUsed.indexOf || !gltf.extensionsRequired) {return;}var v = gltf.extensionsUsed.indexOf('KHR_technique_webgl');if (v == -1) return;// 中招了。。var t = gltf.extensionsRequired.indexOf('KHR_technique_webgl');gltf.extensionsRequired.splice(t, 1, 'KHR_techniques_webgl');gltf.extensionsUsed.splice(v, 1, 'KHR_techniques_webgl');gltf.extensions = gltf.extensions || {};gltf.extensions['KHR_techniques_webgl'] = {};gltf.extensions['KHR_techniques_webgl'].programs = gltf.programs;gltf.extensions['KHR_techniques_webgl'].shaders = gltf.shaders;gltf.extensions['KHR_techniques_webgl'].techniques = gltf.techniques;var techniques = gltf.extensions['KHR_techniques_webgl'].techniques;gltf.materials.forEach(function (mat, index) {gltf.materials[index].extensions || (gltf.materials[index].extensions = { KHR_technique_webgl: {} });gltf.materials[index].extensions['KHR_technique_webgl'].values = gltf.materials[index].values;gltf.materials[index].extensions['KHR_techniques_webgl'] = gltf.materials[index].extensions['KHR_technique_webgl'];var myMaterialExtension = gltf.materials[index].extensions['KHR_techniques_webgl'];myMaterialExtension.technique || (myMaterialExtension.technique = gltf.materials[index].technique);for (var value in myMaterialExtension.values) {var us = techniques[myMaterialExtension.technique].uniforms;for (var key in us) {if (us[key] === value) {myMaterialExtension.values[key] = myMaterialExtension.values[value];delete myMaterialExtension.values[value];break;}}};});techniques.forEach(function (t) {for (var attribute in t.attributes) {var name = t.attributes[attribute];t.attributes[attribute] = t.parameters[name];};for (var uniform in t.uniforms) {var name = t.uniforms[uniform];t.uniforms[uniform] = t.parameters[name];};});}Object.defineProperties(Cesium.Model.prototype, {_cachedGltf: {set: function (value) {this._my_cachedGltf = value;if (this._my_cachedGltf && this._my_cachedGltf._gltf) {fixGltf(this._my_cachedGltf._gltf);}},get: function () {return this._my_cachedGltf;}}});
} catch (e) {console.log(e)
}

方案二：

需要安装KHR_techniques_webgl包，也可能是ktx1不支持造成的