Newton 2.0x Archemedia Open Beta

[JernejL]

Those links in the first post to Newton 2.11 link to files called Newton 2.08. Is that by accident or intentional? Anyways, there is this file http://www.newtondynamics.com/downloads/NewtonWin-2.11.rar

Seems to be a error, 2.11.rar is right.

[Julio Jerez]

upps my mistake,
I copy teh path form teh older link and edi thme, but I forget to change the link version name.
It is fixed now you can try again.

[JCayman]

To Julio Jerez:
Do you want use some features in your engine, like: Soft Body, Fluids, Deformable Body (For Example: Metal, Plastic), Cloth?

[Julio Jerez]

To Julio Jerez:
Do you want use some features in your engine, like: Soft Body, Fluids, Deformable Body (For Example: Metal, Plastic), Cloth?

what do you mean?

[JCayman]

what do you mean?

Excuse, probably my English is really bad. I wished to ask, whether you will add these features in the subsequent versions of the engine?

[Julio Jerez]

yes they will be added.

[JCayman]

Excellently .

[kallaspriit]

Destruction demo is pretty great, will this approach enable the structure to break under it's own weight? For example when I have broken all the pillars except the last, it should crumble by itself (probably already before the last). And when I break the last pillar (last connection of any structure to the ground), everything above just disappears. Great work

[Julio Jerez]

yes that was teh last thing I was trying to work on,
but for some reason personal events not related to Newton have prevented me from working in the engine on weeks.

But yes that is teh secudn part of the destrutions, pieces sodul beacuse into large pieces themself

[FlemMonk]

Hey, I'm back after a long time. This time I'm using Newton for a serious project with 5 other uni students. I've again re-written a module for BlitzMax language however, I have encountered a problem. I wont post any extra code but just the program flow that I'm using with Newton. For some reason the body isn't updating its position and moving anywhere. I was much more successful with Newton 2.0 back a few versions but I never saved any of my code.

Code: Select all

Local nWorld:Byte Ptr = NewtonCreate(Null, Null)
NewtonSetWorldSize(nWorld, [-50.0,-50.0,-50.0], [50.0, 50.0, 50.0])

Local collision:Byte Ptr = NewtonCreateBox(nWorld, 1, 1, 1, 0, Null)
Local body:Byte Ptr = NewtonCreateBody(nWorld, collision)

Local inertia:Float[3]
NewtonConvexCollisionCalculateInertialMatrix (collision, inertia, [0.0, 0.0, 0.0])
NewtonBodySetMassMatrix(body, 10.0, 10.0 * inertia[0], 10.0 * inertia[1], 10.0 * inertia[2])
NewtonBodySetCentreOfMass(body, [0.0, 0.0, 0.0])

Local box:TMesh = CreateCube()
PositionEntity box, 0, 5, 0
NewtonBodySetMatrix(body, box.mat.grid)
NewtonBodySetForce(body, [0.0, -10.0 * 9.8, 0.0])
NewtonReleaseCollision(nWorld, collision)



Then in my main loop I'm doing just a simple:

Code: Select all

   NewtonUpdate(nWorld, 0.1)   
   NewtonBodyGetMatrix(body, mat.grid)


But when I print out the matrix, no positions are been updated. Anyone have any idea what I'm missing? If the flow of Newton commands is correct then It might be an issue with BlitzMax or something else not Newton related. Any help is appreciated.

[Julio Jerez]

NewtonBodySetForce(body, [0.0, -10.0 * 9.8, 0.0])
setting the force just once is no enought not do it.
you need to set a force callback so that the body gets force applied in edge time step.

liek you set it the force will be zero, and the velocity is also zero, so the body is at rest and the matrix does not change.

[FlemMonk]

Ah thats right, I remember using callbacks and having a constant force applied. Thanks so much Julio for the quick reply. However I changed my code so that I'm adding force in the main loop, however the box still doesn't move. If I apply a velocity it does infact move. Is the correct way to use force or velocity for gravity?

[Julio Jerez]

you have to add it in a force and torque callback

[FlemMonk]

Sorry Julio, even in the 1.53 documentation it states "This function is only effective when called from NewtonApplyForceAndTorque callback". After making a force/torque callback 'AddForce' works as expected. Thanks again for your help. I am keen to see the improvements on the PlayerController from last time.

[rvangaal]

@Julio: perhaps a flag (careful when multithreading) can be used to detect this:

In Newton:
bool inCB;

inCB=true;
callBackForceTorque(...);
inCB=false;

void NewtonBodySetForce(...)
{
if(!inCB)error("NewtonBodySetForce() called from outside callback - no effect");
...
}

-----
Another note, with 2.10 linking I get (in both Debug & Release) a bunch of these linker errors:

newton.lib(dgTypes.obj) : warning LNK4204: 'd:\source\trunk\dev_racer\src\Debug\vc90.pdb' is missing debugging information for referencing module; linking object as if no debug info
newton.lib(dgThreads.obj) : warning LNK4204: 'd:\source\trunk\dev_racer\src\Debug\vc90.pdb' is missing debugging information for referencing module; linking object as if no debug info

It seems that some referencing is off, needing a clean rebuild of newton.lib (I'm using static linking, VC9.0/VC2008). Any idea whether this is fixed in 2.11? (trying to avoid switching too often; if it works for me...).

Thanks,
Ruud