I regularly make quick renderings to image a concept and respond to calls for tenders.
I made an illustration with a transparent piece (representing water). This water is in contact with the relief. My problem is that when I render, the transparent surfaces in contact with another part are not aesthetic at all! it makes ugly tracks!
I would like to point out that the water was made with the "imprint" function, so my parts are perfectly complementary.
How do you remove these traces and white lines? (see PC)
What if you delineate the surface underwater with a dividing line, and then remove that surface? All you have to do is fix the appearance of the floor on the inner surface of the volume corresponding to the water.