uniform float Time;
uniform float Amp0;
uniform float Pd;
varying mat3 normalmatrix;
varying vec3  MCposition;
varying vec3  ECposition;
varying vec3  ReflectVector;

void main() 
{
	const float TWOPI = 2.*3.14159265;

	MCposition = vec3( gl_Vertex );
	ECposition = vec3( gl_ModelViewMatrix * gl_Vertex );

	vec3 C0 = vec3( -1., MCposition.y, 0. );

	float rad0 = length( MCposition - C0 );
	float H0 = -Amp0 * cos( TWOPI*rad0/Pd - TWOPI*Time ); 

	float u = -Amp0 * (TWOPI/Pd) * sin( TWOPI*rad0/Pd - TWOPI*Time ); 
	float v = 1.;
	float w = 0.;

	float ang = atan( MCposition.z - C0.z, MCposition.x - C0.x );
	float up = dot( vec2(u,w), vec2(cos(ang), -sin(ang)) );
	float vp = 1.;
	float wp = dot( vec2(u,w), vec2(sin(ang),  cos(ang)) );

	vec3 normal = normalize( vec3( up, vp, wp ) );
	// normal = normalize( gl_NormalMatrix * normal );

	ReflectVector = reflect( MCposition, normal );
	// ReflectVector = normalize( gl_NormalMatrix * ReflectVector );

#ifdef VIEW_INDEPENDENT
	vec3 normal = normalize( vec3( up, vp, wp ) );
	vec3 ReflectVector = reflect( MCposition, normal );
#endif

	gl_Position = gl_ModelViewProjectionMatrix * gl_Vertex;
}