Irrlicht Engine

Hi all. I'm not sure if I'm posting this topic in the right place and please correct me if I'm wrong. I'm about to implement steering behaviors and would like to know how I could combine it with A* on a navigation mesh if it's necessary.

I have the pursuit function very simple:

core::vector3df Pursuit(Agent* evader)
{
double dist = evader->pos().getDistanceFrom(m_Agent->pos());
double time = dist / evader->GetSpeed();
core::vector3df targetPos = evader->GetPosition() + (evader->GetVelocity() * time);
return Seek(targetPos);
}

since a navigation mesh doesn't have any static obstacles (as far as I've noticed it contains just the walkable areas), is the above function enough for a an evader to pursue an agent or it still needs an obstacle avoidance steering behavior or, I should use A* in each update to find a path from evader's position to targetPos calculated from pursuit function?

Hard question... I did use a mix of dynamic avoidance and A*. Meaning I used A* to get a rough path and then I added some dynamic avoidance steering to avoid dynamic obstacles. And lastly I had some workaround that when the bot failed following the A* route it had for any reason (for example someone blocked off a whole entrance with dynamic obstacles and the AI got stuck on it) then I removed those links from my Navigation mesh (after a few failed attempts).

But these are questions that I can't answer generally, for that I didn't code such stuff often enough. There is a very good forum where more AI developers hang around, maybe try asking such questions there: http://forums.aigamedev.com/