public static Vector3f interpolateLinear(float scale, Vector3f startValue, Vector3f endValue) {
        return interpolateLinear(scale, startValue, endValue, null);
    }
Linear interpolation from startValue to endValue by the given percent.
Basically: ((1 - percent) * startValue) + (percent * endValue)

@param scale
           scale value to use. if 1, use endValue, if 0, use startValue.
@param startValue
           Beginning value. 0% of f
@param endValue
           ending value. 100% of f
@return The interpolated value between startValue and endValue.
jme3-core/src/main/java/com/jme3/math/FastMath.java