OpenGL, pitch forces yaw to be 0 - c++

Question

So i have been learning opengl and 3d game programming, i started trying to make a camera class and implement movement and viewing with mouse.
Moving works flawlessly but looking around with mouse isn't working as it should.
Looking up without any problems only works when yaw is 0°, then i can look straight up. But when, yaw < 0 or yaw > 0, looking up wont be straight up but more like this ) or ( .
i also noticed that when yaw isn't 0 looking forces yaw to 0 while either looking down or up.
i dont understand why this is happening, why does pitch only work correctly when yaw is 0 and when it is not why does it forced yaw to be 0.
im following a tutorial nothing really seems wrong
processing mouse movement and updating
void Camera::processMouseMovement(GLfloat xOffset, GLfloat yOffset)
{
GLboolean constrainPitch = true;
xOffset *= this->mouseSensitivity;
yOffset *= this->mouseSensitivity;
this->yaw += xOffset;
this->pitch += yOffset;
if(constrainPitch)
{
if(this->pitch > 90.0f)
{
this->pitch = 90.0f;
}
if(this->pitch < -90.0f)
{
this->pitch = -90.0f;
}
}
this->updateCameraVectors();
}
here's is my update function
void Camera::updateCameraVectors()
{
Vector3 front;
Matrix4 mat4;
front.x = cos((DEG2RAD * this->yaw) * cos(DEG2RAD * this->pitch));
front.y = sin(DEG2RAD * this->pitch);
front.z = sin((DEG2RAD * this->yaw) * cos(DEG2RAD * this->pitch));
this->front = mat4.normalize(front);
this->right = mat4.normalize(mat4.cross(this->front, this->worldUp));
this->up = mat4.normalize(mat4.cross(this->right, this->front));
std::cout << "yaw: " << yaw << std::endl;
std::cout << "pitch: " << pitch << std::endl;
}
in main.cpp
Camera camera(Vector3(0.0f, 0.0f, 0.0f));
GLfloat lastX = width / 2.0f;
GLfloat lastY = height / 2.0f;
GLboolean key[1024];
GLboolean firstMouse = true;
GLfloat deltaTime = 0.0f;
GLfloat lastFrame = 0.0f;
input with glfw, aslo in main.cpp
glfwSetKeyCallback(window, keyCallBack);
glfwSetCursorPosCallback(window, mouseCallBack);
glfwSetInputMode(window, GLFW_CURSOR, GLFW_CURSOR_DISABLED);
in main loop
GLfloat currentFrame = glfwGetTime();
deltaTime = currentFrame - lastFrame;
lastFrame = currentFrame;
glfwPollEvents();
doMovement();
proj = proj.perspective(camera.getZoom(), float(700 / 600), 1.0f, 1000.0f);
glUniformMatrix4fv(uniProj, 1, GL_FALSE, proj.get());
view = camera.getViewMatrix();
mouse callback function
void mouseCallBack(GLFWwindow *window, GLdouble xPos, GLdouble yPos)
{
if(firstMouse)
{
lastX = xPos;
lastY = yPos;
firstMouse = false;
}
GLfloat xOffset = lastX - xPos;
GLfloat yOffset = yPos - lastY;
lastX = xPos;
lastY = yPos;
std::cout << "mouse position x: " << xPos << std::endl;
std::cout << "mouse position y: " << yPos << std::endl;
camera.processMouseMovement(xOffset, yOffset);
}
thank you :)

Answer 1

Assuming front is your average-everyday forward vector, I would calculate it like so:
front.x = cos(DEG2RAD * this->yaw) * sin(DEG2RAD * this->pitch);
front.y = sin(DEG2RAD * this->yaw);
front.z = cos(DEG2RAD * this->yaw) * cos(DEG2RAD * this->pitch);
I'm not keen enough on my trigonometry to understand what your code is doing.
UPDATE: I stared at your code for a while... It looks like the outer set of parenthesis in your code is a mistake. The only other difference between my code and that is my use of sin when calculating forward.x, which would just swap an axis.