初始化，印度版本7.29

src/context/MyObservable.ts

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+import { createContext } from 'react';
+import {Observable} from "@babylonjs/core";
+
+const onGlassObservable = new Observable();
+export const MyObservable = createContext(onGlassObservable);

src/context/ThisLineID.ts

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+import {createContext} from 'react';
+
+let LineID: string | undefined;
+export const ThisLineID = createContext(LineID);