Vehicle tire problem

[Witek900]

Hi

I have problem with tires in Newton 1.53.

Here you have video:
http://www.youtube.com/watch?v=xIwg5KvHNXo

It looks like wheels are rotating around wrong axis. I think that I pass wrong offset matrix or pin vector to NewtonVehicleAddTire.
Pin vector is set to [1, 0, 0] (it's OK, because this 3 cars are placed along X axis) and offset matrix is translation matrix of vector [Tire position - vehicle position]. What do I wrong?

[Julio Jerez]

can you try pin {0, 0, 1}


I do not get why people keep using 1.53, there is a replacement
viewtopic.php?f=9&t=4922

here are two different car demos.
http://www.newtondynamics.com/downloads/atv_demo.rar
http://www.newtondynamics.com/downloads ... le_B19.rar

Please make the conversion to SDK 2.00, teh car joint are implemented as custom joint, which means you get to see the code and see what is going on.

I am not fixing errors in 1.53

[Witek900]

Thx for fast reply.

When I set pin vector to (0, 0, 1) I get this:
http://www.youtube.com/watch?v=eYotGJEMJFw

But look that vehicle isn't "sinking" in the floor, all is ok (except drive direction)

I use Newton 1.53, because i can't use "JointLibrary" under Delphi. I even tried to construct car using joints like Hinge but then it was turning right (when wheels were cylinders) and left (when wheels were spheres or chamfer cylinders). However it should drive straight.

[Julio Jerez]

The car is correct now but it move sideway, try setting the front vector to (0, 0, 1) and the tire pin (1, 0, 0)
I believe it will work,
another alternative is to rotate the car geometry in your model editor so that the direction of travel is (1, 0, 0)

about 2.0 the joint library has a C interface, It is the same exact intecface I use for teh engine, you sould be able to convert the C header to delfi.
The gains you get from 2.0 are a lot, compared to 1.53 speciatly in performance.

[Witek900]

OK. I fliped geometry and set tire pin vector to (0, 0, 1) so everything is OK. Maby I'll convert Newton 2.0 Header from C to Delphi some day...

Thanks for help Julio.

[JernejL]

Maby I'll convert Newton 2.0 Header from C to Delphi some day...

Thanks for help Julio.

See last post here for delphi newton 2.0 header: viewtopic.php?f=9&t=806&start=120#p36179

[Witek900]

Yes, i got it long time ago. I needed JointLibrary header to Delphi, but i've just converted it so I can use Vehicles in under Delphi in Newton 2.0