Method squareDistanceTo

src/main/java/net/minecraft/util/Vec3.java:120–126

The square of the Euclidean distance between this and the specified vector.

(Vec3 vec)

     * The square of the Euclidean distance between this and the specified vector.
     */
    public double squareDistanceTo(Vec3 vec)
    {
        double d0 = vec.xCoord - this.xCoord;
        double d1 = vec.yCoord - this.yCoord;
        double d2 = vec.zCoord - this.zCoord;
        return d0 * d0 + d1 * d1 + d2 * d2;
    }

    /**
     * Returns the length of the vector.