Create a model comment with model id and extData.
this function is only available after a 3D viewer loaded.
Signature:
export declare function create(viewer: Viewer3D, modelId: string, extData?: any): Promise<ModelComment>;| Parameter | Type | Description | 
|---|---|---|
| modelId | string | The model id | 
| extData | any | Extra data object attach to this comment | 
Returns:
Promise<ModelComment>
a promise contains a model comment object