Add callback for when all loading starts and ends about 3dtilesrendererjs HOT 4 OPEN

Hi Garret, thanks for this great library! Could you give a brief example on how this would be accomplished via onLoadModel? How do I know the total amount of models that are going to be loaded so I can compare it with the current count? Sorry in case this is actually obvious. I just hit my quota rate limit on the google tiles API but wanted to give it a go tomorrow.

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You can check the amount of models currently in the queue to be parsed or downloaded using downloadQueue.items.size and parseQueue.items.size. onLoadModel is called every time a model has been downloaded and parsed so when those fields are both set to 0 you know it's complete.

What's your use case exactly? If you have a compelling one and would like to open a PR to make this more convenient I can point you in the right direction.

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Thank you, that works! :)
My use case is similar to here: #378
I'm building a location based 3D editor and so I'm fetching tiles at a specified location via an Orthographic Camera.

I could certainly try, but I come from iOS development and am not too familiar with typescript.

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I could certainly try, but I come from iOS development and am not too familiar with typescript.

The project is in Javascript if that changes anything. Either way up to you - also nice to have help. Happy to give feedback if you'd like to try.

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