wrong transformation of points in rendering - c++

Question

I am rendering a scene with a simple camera in opengl, this is rendering loop:
while(hasFocus)
{
UpdateFrame(GetElapsedTimeInSeconds());
RenderFrame();
SwapBuffers(g_hDC);
}
what I want to do is to select some object in the scene but some transformations act weird.
before rendering the scene a ray went through the scene from view point of camera to mouse,near plane until it reaches far plane. I draw this ray to see whether I am doing the calculations right or not. as you see in the snapshot below the ray is coming from strange position and not from my camera's "eye".
I have my own camera class. this is my initialization:
Camera myCam(0.0f,2.0f,0.0f);
glMatrixMode(GL_PROJECTION);
glLoadIdentity();
gluPerspective(60,(g_windowWidth)/ (g_windowHeight), CAMERA_ZNEAR, CAMERA_ZFAR);
and some other initializations.
in RenderFramefunction I am doing my picking and rendering stuff:
glEnable(GL_DEPTH_TEST);
glEnable(GL_CULL_FACE);
glDisable(GL_LIGHTING);
glViewport( 0,0,g_windowHeight, g_windowHeight);
glClearColor(0.0f, 0.0f, 0.0f, 1.0f);
glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
myCam.setView(); // just set the view matrix with GL_MODELVIEW
myCam.rotateLoc(-0.5, 0,1,0);
glColor3f(1.0,1.0,1.0);
Vector3* pointss = GetRayPoints(); // retrieve the two point for my Ray
setIntersectionPoints(pointss[0],pointss[1]);
RenderFloor();
DrawSpheres(); // inside this I test hit of the ray created by points and the spheres
this is GetRayPoints:
POINT mymouse;
GetCursorPos(&mymouse);
Vector3 pointsOnLine[2];
double mvmatrix[16];
double projmatrix[16];
int viewport[4];
double dX, dY, dZ, dClickY,zz;
glGetIntegerv(GL_VIEWPORT, viewport);
//glGetDoublev (GL_MODELVIEW_MATRIX, mvmatrix);
glGetDoublev (GL_PROJECTION_MATRIX, projmatrix);
dClickY = double (viewport[3] - mymouse.y);
const GLfloat* mtrx = myCam.getViewMat();
mtrx = myCam.getViewMat();
gluUnProject ((double) mymouse.x, dClickY, 0.0,mtrx,projmatrix, viewport, &dX, &dY, &dZ);
pointsOnLine[0] = Vector3( (float) dX, (float) dY, (float) dZ );
gluUnProject ((double) mymouse.x, dClickY, 1.0,mtrx,projmatrix, viewport, &dX, &dY, &dZ);
pointsOnLine[1] = Vector3( (float) dX, (float) dY, (float) dZ );
return pointsOnLine;
and inside DrawSpheres I am checking hit or miss by point-line intersection mathematics and it works well and actually I am selecting the spheres but not in the pixel under the mouse as you saw in snapshot. the problem is just the wrong transformation and therefore position of Ray !
any insight ? is this Ray in camera coordinates and I should bring it into world space by inverse of viewmatrix ?!