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• MoP
  
  Community Member
  5 posts

  Scene::createJoint() problem

  19 December 2008 at 3:07pm

  Hi.
  scene.createJoint() returns null value. I've tried different joint types, all is the same.

  The following is my function for creating distance joint:

   
  Public Function CreateDistanceJoint(ByVal scene As NxScene, ByVal a0 As NxActor, ByVal a1 As NxActor, ByVal anchor0 As Vector3, ByVal anchor1 As Vector3, ByVal globalAxis As Vector3) As NxDistanceJoint
          Dim distanceDesc As New NxDistanceJointDesc
          distanceDesc.actor(0) = a0
          distanceDesc.actor(1) = a1
          distanceDesc.localAnchor(0) = DXVec2Nx(anchor0)
          distanceDesc.localAnchor(1) = DXVec2Nx(anchor1)
          distanceDesc.setGlobalAxis(DXVec2Nx(globalAxis))
   
          Dim dist As Vector3
          dist = Vector3.Subtract(NxVec2DX(a0.getGlobalPosition), NxVec2DX(a1.getGlobalPosition))
          distanceDesc.maxDistance = dist.Length() * 1.5
          distanceDesc.minDistance = dist.Length() * 1
   
          Dim spring As New NxSpringDesc
          spring.spring = 100
          spring.damper = 0.5
   
          distanceDesc.spring = spring
          distanceDesc.flags = NxDistanceJointFlag.NX_DJF_MIN_DISTANCE_ENABLED Or NxDistanceJointFlag.NX_DJF_MAX_DISTANCE_ENABLED
          distanceDesc.flags = distanceDesc.flags Or NxDistanceJointFlag.NX_DJF_SPRING_ENABLED
          distanceDesc.jointFlags = distanceDesc.jointFlags Or NxJointFlag.NX_JF_COLLISION_ENABLED
          Return scene.createJoint(distanceDesc)
      End Function
   

  What am I doing wrong?

  *SE1: Added code tags*

  Last edited: 20 December 2008 at 7:35pm

• SeaEagle1
  
  Administrator
  16 posts

  Re: Scene::createJoint() problem

  20 December 2008 at 7:41pm

  I'll run some tests myself on this, but it might be because of wrong axis or anchor settings. Do you get any errors from PhysX (using its PhysicsSDK.setErrorStream)?

• MoP
  
  Community Member
  5 posts

  Re: Scene::createJoint() problem

  20 December 2008 at 8:51pm

  After calling scene.createJoint(distanceDesc), I get an error NXE_INVALID_PARAMETER.

  distanceDesc.isValid() always returns True, but in wrapper version 0.9.1 it was always False (now I use 0.9.2).

  Could you give me please working code example for creating joints?

  Last edited: 20 December 2008 at 8:52pm

• SeaEagle1
  
  Administrator
  16 posts

  Re: Scene::createJoint() problem

  20 December 2008 at 11:18pm

  Here is the demo code I'm using: http://svn.imaginary-project.net/index.cgi/IGE/view/ige/trunk/IGE%20Demo/Demo.cs look around line 390 for PhysX joints. Just noticed that you're setting NxJointDesc.actor[0] and [1] seperately (and localAnchor too). This probably won't be passed on to PhysX correctly.

  (see the PhysX-sharp page: Properties have to be explicitly set. This means that if, for example, a property returns a vector, just changing the vector won't do anything, you'll have assign the new vector explicitly to the property (much like value type properties in C#))

• MoP
  
  Community Member
  5 posts

  Re: Scene::createJoint() problem

  21 December 2008 at 12:41pm

  Thanks. Now it works