[1.16.4] Connecting adjacent translucent blocks

[Tetracube]

 

As you can see from the image, my custom translucent blocks on the left there aren't "connecting" like the vanilla blocks. I figured this would be a common problem, but searching only turns up questions where the answer is "use notSolid()". I've implemented that as well as RenderType.getTranslucent(). How do I fix this?

[Draco18s]

Have you looked at the vanilla classes involved with Ice and Glass? (Also compare with Leaves)

There (was at one time) a method called DoesSideRender which controlled this behavior.

Edited December 27, 2020 by Draco18s

[Tetracube]

I dug around a while for functions with similar names. The solution was to make the block class inherit BreakableBlock, a very unintuitively named class.