/// <param name="argWorld"></param>
/// <param name="def"></param>
protected internal WeldJoint(IWorldPool argWorld, WeldJointDef def)
: base(argWorld, def)
{
LocalAnchorA = new Vec2(def.LocalAnchorA);
LocalAnchorB = new Vec2(def.LocalAnchorB);
m_referenceAngle = def.ReferenceAngle;
Frequency = def.FrequencyHz;
DampingRatio = def.DampingRatio;
m_impulse = new Vec3();
m_impulse.SetZero();
}