public Vector3f scaleAdd(float scalar, Vector3f mult, Vector3f add) {
        this.x = mult.x * scalar + add.x;
        this.y = mult.y * scalar + add.y;
        this.z = mult.z * scalar + add.z;
        return this;
    }
Multiplies a specified vector by a specified scalar, then adds another
specified vector to it, before storing the result in the current
instance.

<p>this = scalar * mult + add

@param scalar the scaling factor
@param mult the vector to scale (not null, unaffected unless it's
    <code>this</code>)
@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