Need help with phisics (making player jump)

Scripting Issues
1

I’m using the FPS() class found here

I’m trying to get the player to jump,

   def jumpUpdate(self,task):
       """ TODO make the player jump  """ 
       if self.readyToJump: 
           self.jump = 1 
           self.player.addLinearForce( LinearVectorForce(0.0, 0.0, 60.0))
           self.player.removeLinearForce( LinearVectorForce(0.0, 0.0, 60.0))
       else: 
           self.player.addLinearForce( LinearVectorForce(0.0, 0.0, 0.0)) 
       return task.cont

it keeps saying AttributeError: ‘DynamicEntity’ object has no attribute ‘removeLinearForce’

Can someone help me?

2

I really need an answer

3

There is no DynamicEntity.removeLinearForce:

class DynamicEntity(Entity): 
   forceNode = 0 
   actorNode = 0 

   def __init__(self): 
      self.actorNode = ActorNode("DynamicEntity") 
      NodePath.__init__(self,self.actorNode) 
      # init collision 
      self._collisionHandler = PhysicsCollisionHandler() 
      base.cTrav = CollisionTraverser() 
    
   def createForceNode(self): 
      # set up the ForceNode. This contains all the forces that 
      # act on this Entity. 
      self.forceNode = ForceNode("ForceNode") 
      self.attachNewNode( self.forceNode ) 
      base.physicsMgr.attachPhysicalnode( self.actorNode ) 
    
   def addLinearForce( self, force ): 
      if ( self.forceNode == 0 ): 
         self.createForceNode() 
      self.forceNode.addForce( force ) 
      base.physicsMgr.addLinearForce( force ) 

   def setCollisionSolid( self, solid ): 
      collNodePath = Entity.setCollisionSolid( self, solid ) 
      base.cTrav.addCollider( collNodePath, self.collisionHandler() ) 
      self.collisionHandler().addCollider( collNodePath, self ) 
    
   def collisionHandler(self): 
      return self._collisionHandler

I’m pretty sure that you don’t want to remove the force there anyways.

4

Well then how do I keep the player from just rising up continually?

5

You probably will have to define it in dynamic entity so that it calls the method on the underlying force node.

6

Do you mean defining removeLinearForce()?

7

Found a solution:

   def jumpUpdate(self,task):
       """ TODO make the player jump  """ 
       if self.readyToJump: 
           Sequence(Func(self.player.addLinearForce,LinearVectorForce(0,0,self.gravity*2)), Wait(.5), Func(self.player.addLinearForce,LinearVectorForce(0,0,-self.gravity*2))).start()
       return task.cont

still needs a jump filter though :slight_smile: