package tehnut.lib.mc.util;

import net.minecraft.util.math.AxisAlignedBB;

public class BoundHelper {

    public static AxisAlignedBB rotate(AxisAlignedBB bounds, AxisRotation rot) {
        return new AxisAlignedBB(
                rot.getX(bounds.minX, bounds.minZ), bounds.minY, rot.getX(bounds.maxX, bounds.maxZ),
                rot.getZ(bounds.minX, bounds.minZ), bounds.maxY, rot.getZ(bounds.maxX, bounds.maxZ)
        );
    }

    public enum AxisRotation {
        NONE(1, 0, 0, 1),
        CLOCKWISE_90(0, 1, -1, 0),
        OPPOSITE(-1, 0, 0, -1),
        COUNTERCLOCKWISE_90(0, -1, 1, 0);

        private final double xx, xz, zx, zz;

        AxisRotation(double xx, double xz, double zx, double zz) {
            this.xx = xx; this.xz = xz;
            this.zx = zx; this.zz = zz;
        }

        public final double getX(double x, double z) {
            return x * xx + z * xz;
        }

        public final double getZ(double x, double z) {
            return x * zx + z * zz;
        }
    }
}

Add utility for rotating AABBs
Add utility for rotating AABBs

Thanks paul.
