yade-dev team mailing list archive

[Klaus Thoeni <klaus.thoeni@xxxxxxxxx>]

Hi Anton,

I just had a look at py/tests/clump.py, that's the test which fails. I added 
this after line 60 (before NewtonIntegrator is called):

for b in O.bodies: print b.material

and that's what I get:

<FrictMat instance at 0x1014c10>
None

So the second body has no material. I think it's more a problem in the test. 
In a, lets say, real simulation the material always exists (or not?), so I am 
not sure if checking for the material makes sense and it would be quit 
inefficient.

However, I am not familiar with the testing stuff. Is there anyone who knows 
why the second body gives 'None' for the material?

Klaus

On Thu, 19 Jan 2012 06:31:09 PM Anton Gladky wrote:
>  > Real getDampCoeff() { return material->damping; };
> 
> Can you check here a material existence?
> 
> Anton
> 
> On Thu, Jan 19, 2012 at 8:14 AM, Klaus Thoeni <klaus.thoeni@xxxxxxxxx> 
wrote:
> > Hi guys,
> > 
> > can anyone help me on this?
> > 
> > Klaus
> > 
> > On Thu, 12 Jan 2012 06:03:16 PM Klaus Thoeni wrote:
> >> Hi guys,
> >> 
> >> as discussed with Bruno in Barcelona I need different non-viscous
> >> damping coefficients for different materials. I introduced this
> >> capability by adding a variable damping to the base class material
> >> which is initialised with NaN. The body class has a function
> >> getDampCoeff() and in
> >> NewtonIntegrator I use this function in order to change the damping
> >> coefficients. When running some examples it seems that everything works
> >> fine. However, I just run 'yade --test' and it gives me a seg fault:
> >> 
> >> testVelocity (yade.TestSimpleClump)
> >> Clump: velocities of member assigned by NewtonIntegrator ...
> >> Segmentation fault
> >> 
> >> I think I now where the problem is. In NewtonIntegrator I call something
> >> like:
> >> 
> >> if(!isnan(b->getDampCoeff())) dampcoeff=b->getDampCoeff();
> >> 
> >> where getDampCoeff() is defined in body.hpp as:
> >> 
> >> Real getDampCoeff() { return material->damping; };
> >> 
> >> I think the test doesn't have a material and therefore I get the seg
> >> fault. Right? How can we fix this so that I can commit the code?
> >> 
> >> Klaus
> > 
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