How can i set scale

hello,how can i set the ply model scale by its size,beacuse some model originaly look so big , some look so small,so i want judge the model size to set its scale,to make it look nature

Take a look at step 3 of the beginner example from the collection.

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when i doubleclick the model ,haw can i Translate Camera to Focus on Object and Blow up the model