default int toInternal(int absRot) {
        return (absRot + 6 - getRotation()) % 4;
    }
Defines a part that affixes to the side of the block, and can optionally be rotated about
that face. Contains utility methods for converting between internal and absolute rotations and directions.
core/src/main/java/mrtjp/projectred/core/part/IOrientableFacePart.java