Hey there,
It seems when I write out a volume texture for unreal, when I go above 512k the texture size is off (not 4kx4k for example, but 4k x 3840). Also, I'm having to invert the texture within nuke to get the volume on the inside, rather than outside of the object.
I ended up just doing a volume slice manually and building the mosaic in Nuke and it worked fine.
I might have just set something up wrong, but thought I should let you know. Great tools!
-andy