Why viewer showing broken geometry if the model is loaded partially?

Question

As our forge viewer app sometimes needs to load large model, we are trying partial loading as mentioned here-

Minimizing Viewer workloads

Now we are facing a strange problem. When we load a big element(single dbid) and try to rotate or zoom to the item, viewer displaying the item in a very strange way. It's like some parts of the item is cut down. Like this-

But the item should look like this -

It's not a problem for some other items of the same model. Could you please tell me what's going on here?

Answer 1

I can see some heavy quantization artifacts...

This Looks like a 'large offset issue' bug.

Try shifting the model's global offset to the origin, like this article explains: Model aggregating in viewer - coordinate issue