controller-maths.cpp

auto vr = engine->get<polar::system::vr>().lock();
auto head_view = vr->head_view();

auto hand4      = glm::inverse(head_view) * vr->right_hand_view()      * Point4(0, 0, 0, 1);
auto last_hand4 = glm::inverse(head_view) * vr->last_right_hand_view() * Point4(0, 0, 0, 1);

auto hand      = Point3(hand4      / hand4.w);
auto last_hand = Point3(last_hand4 / last_hand4.w);

hand      = glm::normalize(hand);
last_hand = glm::normalize(last_hand);

auto cross = glm::cross(last_hand, hand);

auto axis = Point3(head_view * Point4(glm::normalize(cross), 0));
auto q = glm::angleAxis(0.01f, axis);

orientVel = glm::normalize(q * orientVel);
//orientVel = glm::normalize(orientVel * q);