Did a very rough CPU implementation of Volumetric Billboards into UE 4. Kinda left it behind due to very low performance and lack of geometry shader without engine source editing.
In case you are not familiar with what Volumetric Billboards are here’s the paper’s page about it with video Volumetric Billboards (Philippe Decaudin)
Since watching some niagara videos I got interested again thinking it could be used as a substitute for a geometry shader. Is it possible to set the vert locations of the particle’s tris to whatever you want through niagara?
Cheers.