There is still a bug where octane randomly decides not to render volumes. I attached the scene
If you go to frame 106 you will see no fire and then if you go to frame 115 you will. Up to frame 113 it as simulated using PCG conservation after 113 Buffered. Not sure why.
scene link: https://we.tl/t-MzVOmKkRNn
it seems that if i dont get a message optimizing volumetric octane wont render and it has nothing to do with conservation type
it looks like unchecking SMOKE made octane not to render volumes. Not sure why. It is an old bug.
But overall octane does not render nice looking flames like vray does. Not sure why octane fire is always patchy and fake looking.
Like the burning chair. vray can make a nice looking clear fire where flames begin and gradually more solid. They have access to volumetrics in phoenix and it doesnt work with octane . Can we have a gradual transparency with flames?