NewtonBodyGetAcceleration()

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Re: NewtonBodyGetAcceleration()

Postby Julio Jerez » Mon Apr 15, 2019 5:34 pm

is in file ../applications\demosSandbox\sdkDemos\toolBox\PhysicsUtils.cpp
by the end.
Julio Jerez
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Re: NewtonBodyGetAcceleration()

Postby misho » Mon Apr 15, 2019 5:43 pm

Julio Jerez wrote:is in file ../applications\demosSandbox\sdkDemos\toolBox\PhysicsUtils.cpp
by the end.


Got it, thanks! I thought it was a part of main Newton :wink:
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Re: NewtonBodyGetAcceleration()

Postby misho » Thu Apr 25, 2019 2:45 pm

Hi Julio,

Thanks again for the acceleration equation! Unfortunately - it does not work. It is giving me near zero acceleration on the earth surface, and zero values for the acceleration calculated for contacts.

As I mentioned before, I managed to get "my version" showing me values I expect, for (so far) all cases: in orbit, on the ground, and during powered flight:

Code: Select all
   // G factor: Add up force of gravity, centripetal force and any force due to the powered flight:
   dVector dvFG = dVector(0.0f, 0.0f, 0.0f);
   entSource->GetGravityForce(dvFG);
#if 1

   dVector dvFC = dVector(0.0f, 0.0f, 0.0f);
   dVector dvFB = dVector(0.0f, 0.0f, 0.0f);

//   entSource->GetCentripetalForce(dvFC);
   dvFB = dvAccelerationTotal.Scale(entSource->GetCurrentBodyMass());
   dVector   dvForceSum = dvFG + dvFC - dvFB;
#else
   dVector   dvForceSum = entSource->GetTotalAcceleration();
#endif

   NavData.dGFactor = abs(vLength(dvForceSum) / vLength(dvFG));


As you can see, I skipped adding centripetal acceleration - body in orbit seems to already have that "resolved", as my call GetGravityForce(dvFG); gives me a value of 0 in orbit, and a value of -9.81 on earth surface.
This value is NOT CRITICAL, as it is used only for instrument display purposes, and not in any calculations. Let me know if you have any ideas on what may be wrong, but again, this is nothing urgent, I can live with it for now.

Thanks,
Misho
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