@Michael_Geary Looking at your project, you have BunnyParticles in your level, but you need BunnyPrints in the level instead. BunnyParticles only emits when it’s moved, which is what BunnyPrints does. Second, see the warning in your particle system. You need a fixed relative bounding box when using GPU particles, and you’ll need a big one or you’ll only be able to see the particles from limited angles. In the cascade editor toolbar, to the right of the Bounds button there is a downward facing triangle, click it select Set Fixed Bounds. Then in the main Particle System details tab, scroll down to Bounds and set them all to something like Min: -100000, Max:100000. Also, BunnyPrints should be at 0,0,0 in your level, because the material uses the x location of each particle. In the material, use the Constant3Vector added right before World Position Offset to control the location of the cloud. You can change it to a collection or dynamic parameter if you want to move it around with blueprints.