Someone

Vector view;Vector lookat;Vector eye;Vector center, horz, vert,up;	float dis = 1.0;float fov = m_Scene.GetCamera().GetFOV()*3.1416/180;float vsize = 2*dis*tan(fov/2.0f);float hsize = hsize = vsize*((float)Scene::WINDOW_WIDTH/(float)Scene::WINDOW_HEIGHT);	float hpixel = hsize/(float)Scene::WINDOW_WIDTH;float vpixel = vsize/(float)Scene::WINDOW_HEIGHT;eye = m_Scene.GetCamera().GetPosition();lookat = m_Scene.GetCamera().GetTarget();up = m_Scene.GetCamera().GetUp(); view = (lookat - eye);view.Normalize();center = view*dis;horz = up.Cross(view);horz.Normalize();vert = view.Cross(horz);vert.Normalize();Vector origin = center - (horz*(((float)Scene::WINDOW_WIDTH-1.0f)/2.0f)*hpixel)-(vert*(((float)Scene::WINDOW_HEIGHT-1.0f)/2.0f)*vpixel);Vector pixel = origin + (horz* screenX*hpixel) + (vert*screenY*vpixel);