Since we are talking about eyes, I have a solution to the 'Eyes move in opposite direction' after converting a character from Genesis 3 to Genesis 8.1. It was something I flushed out after a conversation with
TTrick (
Long Story Short). It has to do with the fact that there was, what I would call a fuck up in the way Genesis 3 was built as the eyes on DAZ models is 180° out of orientation for no explicable reason. When you convert the morphs then orientation to the bones is added to the ERC and it 'fixes' the orientation, as no orientation data is provided in the original Genesis 3 morphs.
Now what happens is that a lot of content creators take into account that every Genesis 3 character has this 180° shift and built their expression morphs with this in mind. When Genesis 8 came along, DAZ decided to keep that 180° shift in the eyes. Where it makes everything go fubar is that when you convert a character and use the expressions the eyes move in a wonky direction. But the problem is not only restricted to the eyes; eyelids and lips can also suffer from the same issue.
TTrick showed me how he fixes this by changing the orientation of the eyes using the Tool Settings for the Joint Editor, but that seems like way more work considering most models require all sections of the eyelids also be rearranged.
Here is my easier way to fix this. I am almost 100% sure that if orientation for the bones does not exist then it inherits them from the base model, in our case Genesis 8 Male/Female or Genesis 8.1 Male/Female. So if we simply don't include the orientation for the eyes and eyelids it should be exactly the same as our starting base. This is very easy to do when you are freezing ERC.
I have tried this several different ways, just unchecking XYZ Orientations for the eyes and eyelids, unchecking XYZ Orientations for the whole face, and unchecking XYZ Orientations for the entire morph. I have not seen any visual difference in the way it handles both poses and expressions with any of the methods. You uncheck these in the dialogue box 'ERC Freeze Options' when you freeze the ERC. Then once saved, the morph can be used with confidence that the eyes now move in the DAZ direction and the eyelids move in the DAZ direction based on the Genesis 8/8.1 kinematic.
Here is one caveat, I have not tried this on super morphed characters, I have mostly done Fan Art conversions from Genesis 3 to Genesis 8/8.1. If you have a character that is very plump or has extra large breasts it might not work 100% of the time. I simply don't know.
I hope I am not repeating what has been said before and that people will find this helpful. I tried searching the interwebz for this information but it seems that a lot of DAZ users just live with the issue and just complain about it on the DAZ forums without actually finding a solution. If anyone finds a scenario where this doesn't work, please let me know.