glm quaternion camera rotating on wrong axis

Posted by Jarrett on Game Development See other posts from Game Development or by Jarrett
Published on 2013-11-05T23:58:44Z Indexed on 2013/11/06 4:20 UTC
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I'm trying to get my camera implemented with a glm::quat used to store the rotation.

However, whenever I do circles with the mouse, the camera rotates along the axis I am viewing (i.e. I think it's called the target axis). For example, if I rotated the mouse in a clockwise fashion, the camera rotates clockwise around the axis.

I initialize my quaternion like so:

void Camera::initialize()
{
    orientationQuaternion_ = glm::quat();
    orientationQuaternion_ = glm::normalize(orientationQuaternion_);
}

I rotate like so:

void Camera::rotate(const glm::detail::float32& degrees, const glm::vec3& axis)
{
    orientationQuaternion_ = orientationQuaternion_ * glm::normalize(glm::angleAxis(degrees, axis));
}

and I set the viewMatrix like so:

void Camera::render()
{
    glm::quat temp = glm::conjugate(orientationQuaternion_);

    viewMatrix_ = glm::mat4_cast(temp);
    viewMatrix_ = glm::translate(viewMatrix_, glm::vec3(-pos_.x, -pos_.y, -pos_.z));
}

The only axis' I actually try to rotate are the X and Y axis (i.e. (1,0,0) and (0,1,0)).

Anyone have any idea why I see my camera rotating around the target axis?

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