isOpaqueCube Deprecated

[Ele20002]

I was looking at some old 1.8 code to try and fix some 1.11 problems, and found isOpaqueCube. The point is to remove the ability to see though blocks in a model with gaps (not solid block)

I was wondering what alternatives for 1.11 there are, or if there is another way to implement it. Trying to override in my block class gives an error as they removed it from the superclass

[Draco18s]

Look at vanilla blocks, like stairs or glass, to see what they do.