We have to work with very large models and we're hoping to use the first person camera to walk through them, and eventually do this in VR. The progressive rendering does wonders for improving perceived responsiveness, but it can be disorienting to have so many items around you disappear as you move.
Is there any way to turn progressive rendering off but only for objects closest to the camera? Maybe a number of objects up to a maximum number, or objects within a radius from the camera. Everything further away can load in later and flicker during motion, but it would be nice to keep the nearby objects rendered, especially structural objects like stairs. I've often walked towards stairs just to have them disappear in front of me, forcing me to fly to a platform with E and Q instead of walking.
So far I've only found a way to toggle progressive rendering for the entire model on or off with viewer.setProgressiveRendering(bool) but I haven't found a way to customize the rendering behavior.
Per our Engineering's recommendation can you try set rendering targets with
viewer.impl.setFPSTargets(1, 5, 15) //min, target, max
In fact we've been having similar reports from other developers requesting similar capability to fine tune rendering with large models so our Engineering is considering their options to extend on existing functions and even build them into extensions.