Method rotate

testbed/src/Scene.cpp:165–186

Rotate the camera

// Rotate the camera
void Scene::rotate(int xMouse, int yMouse) {

    const double deltaXMouse = mLastMouseX - xMouse;
    const double deltaYMouse = mLastMouseY - yMouse;

    double deltaHorizRotationAngle = deltaXMouse / mWindowWidth * MOUSE_CAMERA_ROTATION_SCALING_FACTOR * M_PI;
    double deltaVertRotationAngle = deltaYMouse / mWindowHeight * MOUSE_CAMERA_ROTATION_SCALING_FACTOR * M_PI;

    const double newVerticalAngle = mCurrentCameraVerticalAngle + deltaVertRotationAngle;

    // Limit Vertical angle
    constexpr double piOver2 = M_PI * 0.5f;
    if (newVerticalAngle > piOver2 || newVerticalAngle < -piOver2) {
        deltaVertRotationAngle = 0;
    }

    Vector3 localVertAxis = mCamera.getTransformMatrix().getUpperLeft3x3Matrix().getInverse() * Vector3(0, 1, 0);
    mCamera.rotateAroundLocalPoint(Vector3(1, 0, 0), deltaVertRotationAngle, mCenterScene);
    mCamera.rotateAroundLocalPoint(localVertAxis, deltaHorizRotationAngle, mCenterScene);

    mCurrentCameraVerticalAngle += deltaVertRotationAngle;
}