I've made a custom structure and need it to generate facing North. However, the JSON files for custom structures do not allow me to set this feature. Is there another way I can go about doing this? I've looked at some of the vanilla structure generation information in net.minecraft.world.level.levelgen.structure, and, while I found a "rotation" field in the PoolElementStructurePiece class, I'm unsure how I would use it (as it appears to interface with NBT files), or if this is even the proper class/field to use for my purposes. Any direction would be helpful here.

I know very little about structures, but as far as I know all the vanilla structures are all randomly rotated.

See for example IglooStructure.generatePieces() or JigsawPlacement.addPieces()

 

Modifying a pool element would only fix the rotation relative to this overall random rotation.

 

I would guess you would need to write your own Structure with a findGenerationPoint() that either allows the rotation to be configured somehow or hard wires it to what you want?

 

In case anyone comes along with a similar issue, I'll write down what I did to set my structure's orientation and put it here:

I wrote my own structure by extending the Structure class. It has a findGenerationPoint() that utilizes a custom placement class (that is very similar to the JigsawPlacement class). The custom placement class's addPieces() is exactly the same as JigsawPlacement.addpieces() except that it takes rotation as a parameter and uses that to replace the random rotation that the JigsawPlacement.addPieces() method uses.

Thanks for pointing me in the right direction, warjort. Without your help, I'd probably still be fiddling around with PoolElementStructurePiece, to no avail.