blocking_force_ = (min_distance_ - distance_) / inverse_compress_strength_;
// If the spring is fixed, it's not clear what the natural value
- // of blocking_force_ would be. -infinity_f works fine for now.
+ // of blocking_force_ would be (because it always blocks).
+ // -infinity_f works fine for now.
+ // If inverse_stretch_strength > 0, the spring is not fixed (because it can stretch).
if (isnan (blocking_force_) || blocking_force_ == infinity_f)
- blocking_force_ = -infinity_f;
+ blocking_force_ = (inverse_stretch_strength_ > 0) ? 0.0 : -infinity_f;
if (blocking_force_ >= 0)
inverse_compress_strength_ = 0;