POIs not showing up in 2D map when exceeding 100 POIs in one site

Introduction

Problem description

When there are more than 100 POIs, some will not display in the 2D Map view even when zoomed in/out, visibility check on/off. But in Panorama view/Point cloud view, the POIs there are visible.

Scope

This solution applies to NavVis IVION.

Root cause

The reason for this is there is only so much space on the map view, and trying to show 10,000 POIs on the map is not possible in a meaningful way. It's a tradeoff for performance that we do not download all POIs for a floor and then filter out all but a few on the frontend. So we only request a reasonably low amount (like 100), sorted by POI importance, and then apply the screen-space overlap test.

Troubleshooting procedure

The only workaround is to set importance to higher level (we sort by importance for map), but then some other POIs will not be displayed.