Node following another Node

[Dark_Exodus]

Hi

How would you get a node to follow another node? For example a player with an enemy character chasing after him. I know it's a bit of a generalised question but can anyone point me in the right direction?


Also is it possible to display time.

[arras]

thats simple AI what you need.

Basicly:
get coordinates of target object (player)
rotate chasing object to face target (enemy)
move chasing object forward
check if chasing ob. is not coliding with target

you have to do it periodicly (each loop or each X loops)

[arras]

about time ...there is function to get time in Irrlicht ...i dont remember sintax, check documentation.

[Dark_Exodus]

ok thanks, I don't think I totally understand but I'll give it a shot. Also I've looked in the documentation and can't find anything about displaying time.

[arras]

virtual u32 irr::ITimer::getTime() [pure virtual]

[kamikaze942]

rotate chasing object to face target (enemy)

how would i go about doing this? I've got everything set up, but the chasing isn't working because of this.

[Mag-got]

From this thread: http://irrlicht.sourceforge.net/phpBB2/ ... php?t=1325

By squisher

Code: Select all

vector3df nodePos = node->getPosition();
vector3df targetPos = targetNode->getPosition();
vector3df diff = targetPos - nodePos;

node->setRotation(diff.getHorizontalAngle());
node->updateAbsolutePosition();

[kamikaze942]

nice! don't suppose you know how to convert that over to bullet rotations eh?

[Mag-got]

You mean the physics library? What does it need to be, degrees, radians, quaternion?

[kamikaze942]

well i'm using this code for it

Code: Select all

btMatrix3x3 orn = rigidbody->getWorldTransform().getBasis();
orn *= btMatrix3x3(btQuaternion(btVector3(0,1,0), 0.06));
rigidbody->getWorldTransform().setBasis(orn);

looks like they are using quats for it. i'm going to take a loot at it some more later.