-namespace {
-
-glm::quat delta_rot(const glm::vec3 &av, float dt) {
- glm::vec3 half(av * dt * 0.5f);
- float mag = length(half);
- if (mag > 0.0f) {
- float smag = std::sin(mag) / mag;
- return glm::quat(std::cos(mag), half * smag);
- } else {
- return glm::quat(1.0f, 0.0f, 0.0f, 0.0f);
- }
-}
-
-}
-