public Vector3f scaleAdd(float scalar, Vector3f add) {
        x = x * scalar + add.x;
        y = y * scalar + add.y;
        z = z * scalar + add.z;
        return this;
    }
Multiplies by the specified scalar, adds the specified vector, and
returns the (modified) current instance.

<p>this = scalar * this + add

@param scalar the scaling factor
@param add the vector to add (not null, unaffected unless it's
    <code>this</code>)
@return the (modified) current instance (for chaining)
jme3-core/src/main/java/com/jme3/math/Vector3f.java