Function AttachPropagateMass

Descent3/attach.cpp:402–437

Adds and subtracts from mass from connections and disconnections

// Adds and subtracts from mass from connections and disconnections
static void AttachPropagateMass(object *child, bool f_attach = true) {
  object *new_parent;

  if (!child)
    return;

  do {
    new_parent = ObjGet(child->attach_parent_handle);
    ASSERT(new_parent);
    if (!new_parent) {
      return;
    }

    float mass;

    mass = Object_info[child->id].phys_info.mass;

    if (mass < 0.0f)
      mass = 0.0f;

    ASSERT(new_parent->mtype.phys_info.mass >= 0.0f && mass >= 0.0f);

    if (f_attach)
      new_parent->mtype.phys_info.mass += mass;
    else
      new_parent->mtype.phys_info.mass -= mass;

    if (new_parent->mtype.phys_info.mass < 0.0f) {
      new_parent->mtype.phys_info.mass = 0.0f;
    }

    child = new_parent;

    ASSERT(new_parent->mtype.phys_info.mass >= 0.0f);
  } while (child->flags & OF_ATTACHED);
}

static inline void ComputeUltimateAttachParent(object *child) {
  object *cur_obj = child;