public Vector4f scaleAdd(float scalar, Vector4f add) {
        x = x * scalar + add.x;
        y = y * scalar + add.y;
        z = z * scalar + add.z;
        w = w * scalar + add.w;
        return this;
    }
<code>scaleAdd</code> multiplies this vector by a scalar then adds the
given Vector4f.

@param scalar
           the value to multiply this vector by.
@param add
           the value to add
@return this
jme3-core/src/main/java/com/jme3/math/Vector4f.java