[Hi everyone !
I try to visualize scientific data using VR and unreal. I’ve imported data into houdini and then export them through Niagara SOP to unreal 4.25.4.
As you can see in the attached link, the particles are flickering in VR preview but when I set the loop duration to 2seconds for an overall animation of 10seconds it stops flickering, does someone knows what’s going on ? In selected viewport mode the animation is smooth even with a loop duration of 10 seconds 
Microsoft OneDrive - Access files anywhere. Create docs with free Office Online.](Microsoft OneDrive - Access files anywhere. Create docs with free Office Online.)
windows 10, i9-7900X, 64Gb, 1080 GTX, HTC vive pro. All drivers are updated
thanks for the help
Alexandre