An IBlockPos object represents a position in the game.

It might be required for you to import the package if you encounter any issues, so better be safe than sorry and add the import.
import crafttweaker.world.IBlockPos;

ZenMethod	ZenGetter/Caster	戻り値	Description
ZenMethod getX()	ZenGetter/Caster x	戻り値 int	Description Returns the position's X value
ZenMethod getY()	ZenGetter/Caster y	戻り値 int	Description Returns the position's Y value
ZenMethod getZ()	ZenGetter/Caster z	戻り値 int	Description Returns the position's Z value
ZenMethod asPosition3f	ZenGetter/Caster as IPosition3f	戻り値 IPosition3f	Description Returns the position as Position3f Object.

Returns a new IBlockPos that is offset blocks into the direction direction.

IBlockPos getOffset(IFacing direction, int offset);

Alternatively you can directly get the IFacing objects using the static methods provided there.

• IFacing direction → The direction
• int offset → how many blocks in that direction?