+Camera &Camera::Reference(const world::Body &r) noexcept {
+ ref = &r;
+ return *this;
+}
+
+Camera &Camera::FirstPerson(int srf, const glm::vec3 &pos, const glm::vec3 &at) noexcept {
+ track_orient = true;
+
+ float dir = srf < 3 ? 1.0f : -1.0f;
+
+ glm::vec3 position;
+ position[(srf + 0) % 3] = pos.x;
+ position[(srf + 1) % 3] = pos.y;
+ position[(srf + 2) % 3] = dir * (pos.z + Reference().Radius());
+
+ glm::vec3 up(0.0f);
+ up[(srf + 2) % 3] = dir;
+
+ glm::vec3 target;
+ target[(srf + 0) % 3] = at.x;
+ target[(srf + 1) % 3] = at.y;
+ target[(srf + 2) % 3] = dir * (at.z + Reference().Radius());
+
+ view = glm::lookAt(position, target, up);
+
+ return *this;
+}
+
+Camera &Camera::MapView(int srf, const glm::vec3 &pos, float roll) noexcept {
+ track_orient = true;
+
+ float dir = srf < 3 ? 1.0f : -1.0f;
+
+ glm::vec3 position;
+ position[(srf + 0) % 3] = pos.x;
+ position[(srf + 1) % 3] = pos.y;
+ position[(srf + 2) % 3] = dir * (pos.z + Reference().Radius());
+
+ glm::vec3 up(0.0f);
+ up[(srf + 0) % 3] = std::cos(roll);
+ up[(srf + 1) % 3] = std::sin(roll);
+ up[(srf + 2) % 3] = 0.0f;
+
+ glm::vec3 target = position;
+ target[(srf + 2) % 3] -= dir;
+
+ view = glm::lookAt(position, target, up);
+
+ return *this;
+}
+
+Camera &Camera::Orbital(const glm::vec3 &pos) noexcept {
+ track_orient = false;
+ view = glm::lookAt(pos, glm::vec3(0.0f), glm::vec3(0.0f, 1.0f, 0.0f));
+ return *this;
+}
+
+glm::mat4 Camera::Model(const world::Body &b) const noexcept {
+ if (&b == ref) {
+ return track_orient ? glm::mat4(1.0f) : glm::mat4(ref->LocalTransform());
+ } else if (b.HasParent() && &b.Parent() == ref) {
+ return track_orient
+ ? ref->InverseTransform() * b.FromParent() * b.LocalTransform()
+ : b.FromParent() * b.LocalTransform();
+ } else if (ref->HasParent() && &ref->Parent() == &b) {
+ return track_orient
+ ? ref->InverseTransform() * ref->ToParent() * b.LocalTransform()
+ : ref->ToParent() * b.LocalTransform();
+ } else {
+ // TODO: model matrices for path distances > 1
+ return track_orient ? glm::mat4(1.0f) : glm::mat4(ref->LocalTransform());
+ }