My Tank Sim

[Scarabol]

Hi,

i want to make my own tank sim using Newton 2.20 and Irrlicht 3D Engine.

What i made so far?
Just look at this


My Demo works well. Im able to drive around or drive over some over objects and stuff like that.

Now i want to make the chassis unit behave in a more realistic way, especially the chain should adapt objects.

How can i manage to do this?

MfG
Scarabol

[Scarabol]

ok, here is my next step



I got a large amount of chain links and connected them using this:

Code: Select all

         float pivot[3];
         pivot[0] = chainlink->getPosition().X + chainlink->getJointNode("Link")->getPosition().X;
         pivot[1] = chainlink->getPosition().Y + chainlink->getJointNode("Link")->getPosition().Y;
         pivot[2] = chainlink->getPosition().Z + chainlink->getJointNode("Link")->getPosition().Z;
         float pindir1[3];
         pindir1[0] = 0;
         pindir1[1] = 0;
         pindir1[2] = 1;
         NewtonJoint *link = 0;
         link = NewtonConstraintCreateHinge(nworld, pivot, pindir1, chainlinkbody, lastchainlinkbody);
         NewtonJointSetStiffness(link, 1.0);


But as you can see on the screen, the chain links are not connected close enough. I thought SetStiffness could manage this, in case it does not.

How can i manage to connect the chain links closer or "stronger" together?

MfG
Scarabol

[JernejL]

The fast solver may not handle such tracks very well, you may have to change solver to a more exact one.

Depending on what you need it you can just simulate tracks by manipulating body ground contacts.

[Scarabol]

I used:
NewtonJointSetStiffness(link, 1.0f);
NewtonBodySetLinearDamping(chainlinkbody, 1.0f);

Now everything works well. But how can i manage to "close" the chain?

MfG
Scarabol

[JernejL]

just.. reconnect the first and last element of the chain..

[Scarabol]

No sorry wont work because the jont has the same length as the distance between this to elements.

Can i set the length or something like this?

MfG
Scarabol

[JernejL]

I don't understand the problem.. can't you just.. assemble it in a circle, and then position each piece to fit it around the tank wheels?

[RobbRob]

Hi Scarabol

well, I am working on a Newton integration with Irrlicht under Linux, would it be possible getting your code for this simulation?

just a question, if not it's quite ok,

Thank's

Robert

[Scarabol]

I have to think about but maybe i send you the code via PM, it's not that much...

Assemble the chains in a circle is a good idea. I want to check if the joints are correct, how can i display them?
Maybe with a special color for a certain pollution?

MfG
Scarabol

[Scarabol]

I got it the chains are assembled correct now!

Here is my current screenshot:


Im now working on the chains to be connected to the wheels.
First they have to be fixed so they can't move (in driving direction) left or right, but up and down and forward and back.
And second the torque of the accleration wheels (connected to the engine, in real life) should be applied to the chain.

Any ideas about this are very welcome!!!

MfG
Scarabol