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Panda3D Manual: Seek

'Seek' is a behavior where an AICharacter moves in the direction of a target NodePath or position until it reaches that entity.

Video of this behavior in Panda3D :

{{#ev:youtube|-UMeYgZLa8Q}}


In PandAI, seek is defined as :

aiBehaviors.seek(NodePath target, float priority)
aiBehaviors.seek(Vec3 position, float priority)

priority is by default set to 1.0 and is used when using two or more steering behaviors on an AICharacter.


The velocity at which the AICharacter seeks is determined when you first create your AICharacter object using the AICharacter constructor.

  • Note : Seek's direction is calculated only during the first instance of the call and so is more efficient than pursue, if all you want is an object to go to a point.

Here is a full program written implementing 'seek' using PandAI :

import direct.directbase.DirectStart
from panda3d.core import *
from direct.showbase.DirectObject import DirectObject
from direct.task import Task
from direct.actor.Actor import Actor
#for Pandai
from panda3d.ai import *
 
class World(DirectObject):
 
def __init__(self):
base.disableMouse()
base.cam.setPosHpr(0,0,55,0,-90,0)
 
self.loadModels()
self.setAI()
 
def loadModels(self):
# Seeker
ralphStartPos = Vec3(-10, 0, 0)
self.seeker = Actor("models/ralph",
{"run":"models/ralph-run"})
self.seeker.reparentTo(render)
self.seeker.setScale(0.5)
self.seeker.setPos(ralphStartPos)
# Target
self.target = loader.loadModel("models/arrow")
self.target.setColor(1,0,0)
self.target.setPos(5,0,0)
self.target.setScale(1)
self.target.reparentTo(render)
 
def setAI(self):
#Creating AI World
self.AIworld = AIWorld(render)
 
self.AIchar = AICharacter("seeker",self.seeker, 100, 0.05, 5)
self.AIworld.addAiChar(self.AIchar)
self.AIbehaviors = self.AIchar.getAiBehaviors()
 
self.AIbehaviors.seek(self.target)
self.seeker.loop("run")
 
#AI World update
taskMgr.add(self.AIUpdate,"AIUpdate")
 
#to update the AIWorld
def AIUpdate(self,task):
self.AIworld.update()
return Task.cont
 
w = World()
run()

  • Note: To get the full working demo for this, please visit :

https://sites.google.com/site/etcpandai/documentation/steering-behaviors/seek/PandAISeekExample.zip?attredirects=0&d=1