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removeExtension.js
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removeExtension.js
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import ForEach from "./ForEach.js";
import removeExtensionsUsed from "./removeExtensionsUsed.js";
import defined from "../../Core/defined.js";
/**
* Removes an extension from gltf.extensions, gltf.extensionsUsed, gltf.extensionsRequired, and any other objects in the glTF if it is present.
*
* @param {object} gltf A javascript object containing a glTF asset.
* @param {string} extension The extension to remove.
*
* @returns {*} The extension data removed from gltf.extensions.
*/
function removeExtension(gltf, extension) {
removeExtensionsUsed(gltf, extension); // Also removes from extensionsRequired
if (extension === "CESIUM_RTC") {
removeCesiumRTC(gltf);
}
return removeExtensionAndTraverse(gltf, extension);
}
function removeCesiumRTC(gltf) {
ForEach.technique(gltf, function (technique) {
ForEach.techniqueUniform(technique, function (uniform) {
if (uniform.semantic === "CESIUM_RTC_MODELVIEW") {
uniform.semantic = "MODELVIEW";
}
});
});
}
function removeExtensionAndTraverse(object, extension) {
if (Array.isArray(object)) {
const length = object.length;
for (let i = 0; i < length; ++i) {
removeExtensionAndTraverse(object[i], extension);
}
} else if (
object !== null &&
typeof object === "object" &&
object.constructor === Object
) {
const extensions = object.extensions;
let extensionData;
if (defined(extensions)) {
extensionData = extensions[extension];
if (defined(extensionData)) {
delete extensions[extension];
if (Object.keys(extensions).length === 0) {
delete object.extensions;
}
}
}
for (const key in object) {
if (Object.prototype.hasOwnProperty.call(object, key)) {
removeExtensionAndTraverse(object[key], extension);
}
}
return extensionData;
}
}
export default removeExtension;