Function onBeforeRender

onBeforeRender(cb, opts?): (() => void)
Register a callback in the engine onBeforeRender event
This is called every frame before the main camera renders
Parameters
- cb: LifecycleMethod
  The callback to be called
- Optional opts: LifecycleMethodOptions
Returns (() => void)
A function that can be called to unregister the callback
- - (): void
  - Returns void
Example
```
onBeforeRender((ctx : Context) => {
    // do something
}
```

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