加载3DTileset模型

//加载3DTileset模型

 var tileset = new Cesium.Cesium3DTileset({ url:'http://localhost:8888/3d/bbb/tileset.json'});
tileset.readyPromise.then(function(tileset) {
  viewer.scene.primitives.add(tileset);
  viewer.zoomTo(tileset, new Cesium.HeadingPitchRange(0.0, -0.5, tileset.boundingSphere.radius * 2.0));
  }).otherwise(function(error) {
     console.log(error);
     }); */

//HK错误
var fixGltf = function (gltf) {
if (!gltf.extensionsUsed) {
return;
}
var v = gltf.extensionsUsed.indexOf(‘KHR_technique_webgl’);
var t = gltf.extensionsRequired.indexOf(‘KHR_technique_webgl’);
if (v !== -1) {
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['KHR_technique_webgl'].values = gltf.materials[index].values;
        gltf.materials[index].extensions['KHR_techniques_webgl'] = gltf.materials[index].extensions['KHR_technique_webgl'];

        var vtxfMaterialExtension = gltf.materials[index].extensions['KHR_techniques_webgl'];

        for (var value in vtxfMaterialExtension.values) {
            var us = techniques[vtxfMaterialExtension.technique].uniforms;
            for (var key in us) {
                if (us[key] === value) {
                    vtxfMaterialExtension.values[key] = vtxfMaterialExtension.values[value];
                    delete vtxfMaterialExtension.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._vtxf_cachedGltf = value;
if (this._vtxf_cachedGltf && this._vtxf_cachedGltf._gltf) {
fixGltf(this._vtxf_cachedGltf._gltf);
}
},
get: function () {
return this._vtxf_cachedGltf;
}
}
});

标签：3DTileset,KHR,模型,加载,extensions,var,techniques,webgl,gltf
来源： https://blog.csdn.net/weixin_42530658/article/details/120598249