Agent::getNeighborSubsetInRange(): Added an efficient shortcut for when the...

Agent::getNeighborSubsetInRange(): Added an efficient shortcut for when the requested "subset" is simply the entire set of neighbors.

src/core/agent.cpp

@@ -98,6 +98,11 @@ void Agent::UpdateVelocityAndPosition(float dt)
 
 NeighborList Agent::getNeighborSubsetInRange(float range) const
 {
+	// if the requested range is big enough, simply return all neighbors that were already computed
+	if (range >= settings_.policy_->getInteractionRange())
+		return neighbors_;
+	
+	// otherwise, create a new list that contains a subset
 	NeighborList result;
 
 	// add all neighboring agents in range