Slider joints and local rotation

[AggrorJorn]

I have slider joints successfully working but I am left with a problem. Right now my object can move beautifully across the x axis. But now lets say that both the parent (a pivot) and the child (a box) are rotated 30 degrees. The code for the joint is this:

slidingDoorJoint = Joint::Slider(0,0,0, 1,0,0, slidingDoor,slidingDoorPivot

But what if I my object is rotated 30 degrees? I tried setting the rotation of the joint itself but that doesn't work.

 

try it yourself:

 

#include "App.h"
using namespace Leadwerks;App::App() : window(NULL), context(NULL), world(NULL), camera(NULL) {}
App::~App() { delete world; delete window; }//sliding Door
Pivot* slidingDoorPivot;
Model* slidingDoor;
Joint* slidingDoorJoint;
bool App::Start()
{
   //Create a window
   window = Window::Create("_12_Joints");//Create a context
   context = Context::Create(window);

   //Create a world
   world = World::Create();//Create a camera
   camera = Camera::Create();
   camera->Move(0, 1, -4);
   camera->SetRotation(0,0,0);
   Light* light = DirectionalLight::Create();
   light->SetRotation(45,45,0);

   //Sliding door
   Shape* slideDoorShape = Shape::Box(0,0,0 ,0,0,0, 2,4,0.2);
   slidingDoorPivot = Pivot::Create();
   slidingDoorPivot->SetPosition(-2,0,0);
   slidingDoorPivot->SetRotation(0,30,0);

   slidingDoor = Model::Box(2,4,0.2);
   slidingDoor->SetShape(slideDoorShape);
   slidingDoor->SetMass(1);
   slidingDoor->SetPosition(-2,0,0);
   slidingDoor->SetRotation(0,30,0);
   slidingDoorJoint = Joint::Slider(0,0,0, 1,0,0, slidingDoor,slidingDoorPivot,-2, 2);
   slideDoorShape->Release();return true;
}
bool App::Loop()
{
   //Close the window to end the program
   if (window->Closed()) return false;

   float sliderForce = window->KeyDown(Key::E) - window->KeyDown(Key::Q);
   slidingDoor->AddForce(sliderForce* Time::GetSpeed() * 2,0,0);

   Time::Update();
   world->Update();
   world->Render();
   context->Sync(false);return true;
}

[Mumbles]

I would have thought you just attach the joint to the door (both totally unrotated), and then rotate the door. Would that not automatically rotate the joint -with- the door?

[AggrorJorn]

The joint creation requires a child and parent object. The joint itself is not an entity.

[Mumbles]

Oh, I've been using newton for too long, I'm so used to using the custom 6DOF joint that I totally forget that the normal joints need parents.

 

But in Newton 2 (I know Newton 3 is out, but I'm still using 2), even if you do create a joint with a parent, you can call NewtonBodySetMatrixRecursive (which sounds like the SetMatrix function in Leadwerks with the recursive flag set to true) on the 'parent', and it will move all children too, and rotates all the joint pins on the parent to match.

 

I don't know if Leadwerks allows this or not, or if you have to call EntityParent first - or whatever that function is called in the new version, so that the door is parented to the pivot.

 

But in my mind though, I'm still sure that moving and rotating only the pivot (the parent), after they have been joined together is the way you're supposed to do it. That's certainly how you do it in Newton 2.

[AggrorJorn]

I found that function you are talking about.however it requires a newton body, which I can't access, and a float matrix. I also don't think this is the way Josh intends users to work like. But I could be wrong.

[YouGroove]

I'm lot more interested on attaching objects to some bone of animated model with some offsets.

[AggrorJorn]

I am still stuck with this.

[AggrorJorn]

I don't know what else to try here. I made a lot of different combinations but it just doesn't work

 

 

 slidingDoorJoint->SetRotation(0,30,0);
 slidingDoorPivot->SetRotation(0,30,0);
 slidingDoorJoint->SetRotation(0,30,0, 1);
 slidingDoorPivot->SetRotation(0,30,0, 0);
 slidingDoorJoint->SetRotation(0,30,0, 0);
 slidingDoorPivot->SetRotation(0,30,0, 1);
 slidingDoor->SetRotation(0,30,0, 1);
 slidingDoor->SetRotation(0,30,0, 0);