As soon as I disable trackedentity it appears.
Hi @Hayden_Lang ,
Thanks for you for your post and for using Cesium.
The Particle System and TrackedEntity do work together, so there is nothing fundamentally incompatible about using them together. Are you able to provide an example of what you are seeing using our sandcastle tool https://sandcastle.cesium.com/ to help us understand better?
One possibility is that the spawner is out of frame. Seeing your code will help drill down more.
Thanks,
Luke