Solved! Go to Solution.
A small update on this, I am having some trouble rendering touching transparent materials. Say two walls in ArchiCAD, both in the same transparent material, meeting in a corner. When I try to render it shows similar issues to the first post. However, they are the same material and should merge right? They merge fine in sections and regular 3d, but when rendering I still get the edges.
The balcony in the attached image consists of 3 walls and a slab, all in the same material, but the connections appear and disrupts the shading in a render.