I found that I misunderstood what the teacher was saying, those images were for the CG machine to better incorporate more stuff into the composite rather than the need to make a new UAU.
FIRST ONE（infact is last week one)
Write the position of the wall and the position of the candle by write geo, then read and give the material in maya
When I exported I found that each layer of aov had each become a file! I eventually found the setting to merge the aov in one file in the export settings. Because I can’t imagine I’d have to manually composite a dozen files in nuke haha
I put the final touches on the roto I made
The second one
At first I created only simple masks and toning, without distinguishing between the edges and the core. And because of the keylight the green part of the foreground was removed! And part of it was lost. So the initial result was particularly bad. I asked my teacher, who told me to refer to other examples to create separate masks for the edges and the centre, so I modified the second version. And used roto to snap out the removed green in the foreground.
First Edition：
Revised version
（Look at my cute little green ball! UWU）