unity sqrmagnitude

The `sqrMagnitude` property in Unity is used to find the squared length of a vector. It is similar to the `magnitude` property, but instead of finding the actual length of the vector, it finds the length squared. This can be useful in some calculations where the actual length is not necessary, as it is quicker to compute the squared length than the actual length.

For example, if you wanted to compare the lengths of two vectors, you could use their `sqrMagnitude` values, rather than their `magnitude` values, to avoid the expensive square root operation:

Vector3 a = new Vector3(1, 2, 3);
Vector3 b = new Vector3(4, 5, 6);

if (a.sqrMagnitude > b.sqrMagnitude)
{
    Debug.Log("Vector a is longer than vector b");
}

In this example, we compare the `sqrMagnitude` values of two `Vector3` objects, `a` and `b`, to determine which one is longer. This is faster than computing their actual lengths with the `magnitude` property.

Note that the `sqrMagnitude` property is read-only, meaning you cannot modify the squared length of a vector directly. To modify the length of a vector, you must use other methods, such as `Normalize` or `Scale`.