I made a video with reflections in the mirror. A cat with a tail (ears and eyes) and a waterfall are reflected there. To get a more realistic correct reflection, I made a mirror copy of the waterfall and the cat in a free converter. And most importantly, I made myself a hint in the form of a render with similar-sized shapes, otherwise it is impossible to guess what the reflection in the video looks like. Thanks to Cecilia.
In order for the waterfall in the mirror to be properly synchronized with the real waterfall in the bathtub, I found out how the horizon line runs. It takes place at the viewer's eye level.
Now I've taken a freeze frame just as the water reaches the horizon line. And the reflection (a mirror gif with reduced dimensions) was also positioned exactly along the horizon line in the lower part of the water at the same moment). I precisely synchronized two waterfalls - the real one in the bathtub and the small one in the mirror. I looked to make the reflection look like a hint-render, where there is a real reflection of the cylinder in the mirror, I placed a small waterfall exactly in the place of the reflection in the hint-render. I did the same with the cat. Reflection in the mirror is the most difficult, it requires accuracy and precision. Otherwise, there will be a lie that will be visible. Now everything is more or less true. With the exception of the cat's eyes, the back of the head will be reflected in the real mirror, but I only have a mirror copy of the gif. This is not quite the right picture, but there is no other way.
https://www.mediafire.com/file/z19jqfarn9781h...0%25BD%25D0%25B0.avi/file
