Thanks for joining. I think I covered all the questions posted here so far, let me know if you have more.
I mentioned that the Noise node is very expensive for Volume materials and should be avoided. You can see this yourself with ‘profilegpu’, compare the cost of volume material voxelization with and without a Noise node. Sometimes you can make your own simple and cheap noise by just combining a few sine / cos waves. But sometimes you really want a tiling volume texture containing noise values.
has created tools to bake noise down to pseudo volume textures which are much cheaper than the Noise node. He covers this in a livestream here:Realtime Simulation and Volume Modelling Plugin | Live Training | Unreal Engine - YouTube
's plugin containing the Material Functions to do the magic:
http://unreal-engine-public-share-cdn.unrealengine.com/ShaderBits-GDC-Pack.zip