If you followed that tutorial, there’s an important distinction to be made here. You’re spawning particles on a grid, the particles themselves are facing you, the grid isn’t, hence why it remains facing that direction.
You have two options here:
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From the completed output of the array from what he showed you in the video, create a timer by event and get your player character, get the controller and set the Z by splitting the struct to a Set World Rotation node. That will update its rotation during the timer. Don’t forget to clear the timer handle after you’re done.
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In the niagara system Sample Texture module, there’s a bool for Transform UV into position after ticking that, there’s another bool for Orient UVs to Camera.