Function do_physics_sim

physics/physics.cpp:681–1609

----------------------------------------------------------------------------------------------------------- Simulate a physics object for this frame

//	-----------------------------------------------------------------------------------------------------------
// Simulate a physics object for this frame
void do_physics_sim(object *obj) {
  // Since we might not call FVI, set this here
  Fvi_num_recorded_faces = 0;

  int n_ignore_objs = 0;                    // The number of ignored objects
  int ignore_obj_list[MAX_IGNORE_OBJS + 1]; // List of ignored objects

  int fate;            // Collision type for response code
  vector movement_vec; // Movement in this frame
  vector movement_pos; // End point of the movement

  int count = 0; // Simulation loop counter
  int sim_loop_limit = (obj->type == OBJ_PLAYER) ? MAX_PLAYER_SIM_LOOPS : MAX_NON_PLAYER_SIM_LOOPS;

  int objnum = OBJNUM(obj); // Simulated object's index
  fvi_info hit_info;        // Hit information
  fvi_query fq;             // Movement query

  float sim_time_remaining = Frametime;     // Amount of simulation time remaining (current iteration)
  float old_sim_time_remaining = Frametime; // Amount of simulation time remaining (previous iteration)

  vector init_pos = obj->pos;   // Initial position
  int init_room = obj->roomnum; // Initial room

  vector start_pos; // Values at the start of current simulation loop
  vector start_vel;
  matrix start_orient;
  vector start_rotvel;
  angle start_turnroll;
  int start_room;

  float moved_time;                         // How long objected moved before hit something
  physics_info *pi = &obj->mtype.phys_info; // Simulated object's physics information

  int bounced = 0; // Did the object bounce?

  vector total_force; // Constant force acting on an object

  bool f_continue_sim;            // Should we run another simulation loop
  bool f_start_fvi_record = true; // Records the rooms that are passed thru

  bool f_turn_gravity_on = false;

  // Assert conditions
  ASSERT(obj->type != OBJ_NONE);
  ASSERT(obj->movement_type == MT_PHYSICS);
  ASSERT(!(obj->mtype.phys_info.flags & PF_USES_THRUST) || obj->mtype.phys_info.drag != 0.0);

  ASSERT(std::isfinite(obj->mtype.phys_info.velocity.x)); // Caller wants to go to infinity!  -- Not FVI's fault.
  ASSERT(std::isfinite(obj->mtype.phys_info.velocity.y)); // Caller wants to go to infinity!  -- Not FVI's fault.
  ASSERT(std::isfinite(obj->mtype.phys_info.velocity.z)); // Caller wants to go to infinity!  -- Not FVI's fault.

#ifdef _DEBUG
  if (!Game_do_flying_sim) {
    return;
  }
#endif