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Panda3D Manual: Flee

'Flee' is an AI behavior where an AICharacter will move in the opposite direction to a target NodePath or position.

https://www.youtube.com/watch?v=sXzzuK2Vnnk

In PandAI, 'Flee' is defined as :

aiBehaviors.flee(NodePath target, double panic_distance, double relax_distance, float priority)
aiBehaviors.flee(Vec3 position, double panic_distance, double relax_distance, float priority)

where :

Panic Distance is the radius of detection.

Relax Distance is the distance from the panic distance radius after which the object should stop fleeing once flee has been initiated.

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 flees is determined when you first create your AICharacter object using the AICharacter constructor.

  • Note: 'Flee' takes in a target or a position to be fled away from; this position should be static. (For moving objects use Evade).

A fully working flee demo :

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(2, 0, 0)
        self.fleer = Actor("models/ralph",
                                 {"run":"models/ralph-run"})
        self.fleer.reparentTo(render)
        self.fleer.setScale(0.5)
        self.fleer.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("fleer",self.fleer, 100, 0.05, 5)
        self.AIworld.addAiChar(self.AIchar)
        self.AIbehaviors = self.AIchar.getAiBehaviors()
 
        self.AIbehaviors.flee(self.target, 5, 5)
        self.fleer.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()

To get a working demo of this example, please visit :

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