Making a Block that Doesn't Obstruct Monster Vision

[Syric]

Is it possible to make a block that monsters will be able to see through? Ideally a monster would be able to target a player on the other side of this block and then pathfind directly through it rather than around.

[H3roDude]

Mobs walk over trapdoors

[Syric]

They don't try to walk through them, though. Trapdoors are the opposite situation: mobs treat them as full blocks when they're not, whereas I want mobs to treat my blocks as though they're not there. Simply overriding isPathfindable() isn't sufficient for my situation.

[Syric]

The trick is making the block be of a material that's nonSolid(). Because you unfortunately can't make your own materials, I'm using Materials.PORTAL and then overriding the block's getCollisionShape() method so it remains collidable.