PhysX Joints!

[false3d]

Hi. I've trouble with joints at PhysX SDK 2.3

I create NxRevoluteJoint, but it is not working correctly.

Can someone post here some simple code to show me ideal declaration of this joints.

 

[SuperGee]

Well SDK 2,5 is out now.

But I think you get more response on the Developers support discusion form of Ageia site.
There are the experts. But I think there is a 2.3 section to.
But it's all not public. It's for registerd members.

 

[Lord of Shadows]

In the 2.4 sdk there are pleanty of examples and going from that it looks like you must do something like this:

NxRevoluteJointDesc	revDesc;
NxRevoluteJoint		*revJoint;

revDesc.actor[0] = createCube(0, 50, 0);
revDesc.actor[1] = createCube(2, 50, 2);

revDesc.setGlobalAxis( NxVec3(1.0, 0.0, 0.0) );
revDesc.setGlobalAnchor( NxVec3(1.0, 0.0, 0.0) );

revJoint = (NxRevoluteJoint *)gScene->createJoint(revDesc);

I just made up some vectors for axis/anchor, you are going to want to find out what they really should be set to by reading the docs. Seems you could also attach motors to these things to make them go on their own, but that requires a little more to setup.

edit: A motor requires you to setup these additional fields

	revDesc.motor.maxForce = 1000;
	revDesc.motor.velTarget = 10.0;
	revDesc.flags |= NX_RJF_MOTOR_ENABLED;

 

[false3d]

Ok, I've tried to do something like you've wrote, but... It works not correctly =(

setGlobalAxis - as I understand - this Axis is axis, the object rotates around. It must be normalized.

revDesc.setGlobalAnchor - WHAT IS IT!? Is this global position of central rotation point?




PS: Is there 2,5 version for free downloading?

 

[Lord of Shadows]

http://cin.ufpe.br/~sbgames/proceedings/tutorials/SBGames06TC01_PhysX.pdf - this looks interesting as it's a bit easier to understand 3rd party comprehension of something. Seems anchor point is the coordinate where the hinge originates in your coordinate system. I'll see if I can get a little hinge going myself this time so I can really explain things.

As for whats the latest sdk I'm not sure, I have 2.4 right now and havent messed with it in quite a while.

Edit: I couldnt make much sense with revolute joints, but a spherical joint gave me the effect that I expected so I suppose my settings are correct. Good luck

 

[false3d]

Thanks a lot. I'll try it...

PS: with spherical - I've no problem but revolut... fffuuuhhhh. I'll try