[![enter image description here][1]][1]


  [1]: https://i.sstatic.net/EdKZy.png

Hi there, normally I am able to find all the answers on this forum and it got me very far of what I want to realise. However, I wasnt able to find an answer to the following problem.

I created different planes and I want the edges to merge perfectly so it looks like one big plane. In the viewport they look good, but when I render them you see huge gaps (see picture). Initially I wanted to cover up the edges of my flip fluid surface, any tips about that would be very helpful because again huge gaps appear!

In the picture, the middle surface is a flip fluids and the other two are just planes.

Let me know if any additional information is needed, thanks in advance!