//This needs to use the same function as the heightAt(x, z) method so that the normal at a point can be calculated e.g. the normal at a point on top of the wave would be straight up
public Vector3 normalAt(float x, float z)
{
Vector3 normal = new Vector3();
foreach (GameObject wave in GameObject.FindGameObjectsWithTag(Tags.waveFunction))
{
WaveFunction function = wave.GetComponent <WaveFunction> ();
normal += function.normalAt(x, z) * function.amplitude; //, transform.forward.x, transform.forward.z);
}
return(normal);
//return wave1.normalAt (x, z) * wave1.amplitude + wave2.normalAt (x, z) * wave2.amplitude;
//return Vector3.up;
//float argument = Time.realtimeSinceStartup + x * frequency * transform.forward.x + z * frequency * transform.forward.z;
//float nx = amplitude * frequency * transform.forward.x * Mathf.Cos (argument);
//float ny = 0;//-1.0f;
//float nz = amplitude * frequency * transform.forward.z * Mathf.Cos (argument);
//return new Vector3 (nx, ny, nz).normalized * -1; // Not sure about sign. Maybe you need to multiply the result by -1.
}
