Does anyone out there know the best way to go about creating a volumetric based Rainbow in the sky ?
ANY form of rainbow effect really ?
It needs to work in VR as well
Perhaps via a post process attached to the pawn ?
I would use a mesh personally.
Trying to make this a post effect in VR just sounds like a massive performance sink to me.
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until they have perfected caustics in the new release I am using a simple plane with transparency.
not what I want but it will do for now
I can just imagine how it might work using volumetrics and caustics and even particles… just as it does in the real world… but I guess a plane will suffice 
Definitely use a grid. Other options will be significantly more resource intensive.