nrtb-core team mailing list archive

[Rick Stovall <fpstovall@xxxxxxxxx>]

Public bug reported:

In cpp/sim_engine/base_object/base_object.cpp we are not applying motion
properly, only half the deltaV should applied to motion, rather than the
entire deltaV. In other words:

velocity = oldV + (accel*Time);
applyV = oldV + ((accel*Time)/2);
location += applyV * time

rotation should be handled in similar manner. Following is the method
where the fault lies:

bool base_object::apply(int time, float quanta)
{
  // move acording to forces
  float tmass = mass + mass_mod;
  triplet a = force / tmass;
  triplet ra = torque / (tmass * 0.5); // not accurate!!
  velocity += (a  + accel_mod) * quanta;
  rotation += (ra + torque_mod) * quanta;
  location += velocity * quanta;
  attitude += rotation * quanta;
  // apply post-effectors
  bool killme (false);
  for (auto e : post_attribs)
    if (e.second->tick(*this, time))
      killme = true;
  return killme;
};

** Affects: nrtb
     Importance: Critical
     Assignee: Rick Stovall (fpstovall)
         Status: New

** Affects: nrtb/alpha
     Importance: Critical
     Assignee: Rick Stovall (fpstovall)
         Status: New

** Changed in: nrtb
   Importance: Undecided => Critical

** Changed in: nrtb
     Assignee: (unassigned) => Rick Stovall (fpstovall)

** Changed in: nrtb
    Milestone: None => sprint-005a

** Also affects: nrtb/alpha
   Importance: Critical
     Assignee: Rick Stovall (fpstovall)
       Status: New

** Branch linked: lp:~fpstovall/nrtb/fps-bugsfix-005

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https://bugs.launchpad.net/bugs/1276332

Title:
  Delta V motion not applied properly

Status in The New Real Time Battle Project:
  New
Status in New Real Time Battle alpha series:
  New

Bug description:
  In cpp/sim_engine/base_object/base_object.cpp we are not applying
  motion properly, only half the deltaV should applied to motion, rather
  than the entire deltaV. In other words:

  velocity = oldV + (accel*Time);
  applyV = oldV + ((accel*Time)/2);
  location += applyV * time

  rotation should be handled in similar manner. Following is the method
  where the fault lies:

  bool base_object::apply(int time, float quanta)
  {
    // move acording to forces
    float tmass = mass + mass_mod;
    triplet a = force / tmass;
    triplet ra = torque / (tmass * 0.5); // not accurate!!
    velocity += (a  + accel_mod) * quanta;
    rotation += (ra + torque_mod) * quanta;
    location += velocity * quanta;
    attitude += rotation * quanta;
    // apply post-effectors
    bool killme (false);
    for (auto e : post_attribs)
      if (e.second->tick(*this, time))
        killme = true;
    return killme;
  };

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