////  PhysicsHelpers.h//  libraries/shared/src////  Created by Andrew Meadows 2015.01.27//  Copyright 2015 High Fidelity, Inc.////  Distributed under the Apache License, Version 2.0.//  See the accompanying file LICENSE or http://www.apache.org/licenses/LICENSE-2.0.html// #ifndef hifi_PhysicsHelpers_h#define hifi_PhysicsHelpers_h #include <glm/glm.hpp>#include <glm/gtc/quaternion.hpp>#include <QUuid> // TODO: move everything in here to the physics library after the physics/entities library// dependency order is swapped. const int32_t PHYSICS_ENGINE_MAX_NUM_SUBSTEPS = 6; // Bullet will start to "lose time" at 10 FPS.const uint32_t NUM_SUBSTEPS_PER_SECOND = 90;const float PHYSICS_ENGINE_FIXED_SUBSTEP = 1.0f / (float)NUM_SUBSTEPS_PER_SECOND; const float DYNAMIC_LINEAR_SPEED_THRESHOLD = 0.05f;  // 5 cm/secconst float DYNAMIC_ANGULAR_SPEED_THRESHOLD = 0.087266f;  // ~5 deg/secconst float KINEMATIC_LINEAR_SPEED_THRESHOLD = 0.001f;  // 1 mm/secconst float KINEMATIC_ANGULAR_SPEED_THRESHOLD = 0.0004f;  // ~0.025 deg/sec // return incremental rotation (Bullet-style) caused by angularVelocity over timeStepglm::quat computeBulletRotationStep(const glm::vec3& angularVelocity, float timeStep); namespace Physics {    int32_t getDefaultCollisionMask(int32_t group);     void setSessionUUID(const QUuid& sessionID);    const QUuid& getSessionUUID();}; #endif // hifi_PhysicsHelpers_h