Hello, I can't reproduce this inside the sandcastle, but I am hoping to get some insight into what may cause this issue. I have an EntityCollection that has an entity. This entity has a model, billboard, and point specified. However, each of these have their properties set using TimeIntervalCollectionProperty. In other words, depending on some internal logic, the entity sometimes is shown as a billboard and sometimes is shown as a 3d model. The pointGraphic is in case the billboard fails to load. I use intervals on the "show" properties to turn on/off the model/billboard/point when the other is turned on.
I also have the position property set using the sampledPositionProperty so that it will interpolate.
I also have the historical path visible so that we can see where it is.
This is all working great. However, sometimes the 3d model just disappears. This is usually in the middle of the path, say starting 1/3 of the way from seattle to china and reappears at 2/3 of the way. However, if I zoom out, it shows up for more of the path.
I would like to add images but can't figure out how. I will see if I can reply from my email with images.