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How to get information from an Animation with MotionStudyResult GetLinearVelocity

Question asked by Hans Björk on Jul 25, 2017
Latest reply on Jul 27, 2017 by Hans Björk

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I have a simple assy with an Animation that moves a few components.

I try to get motion data from the animation with GetLinearVelocity, but I get only vectors of { 0.0, 0.0, 0.0 }.

The code looks something like (c++):

CComPtr<IMotionStudyResults> pResults = NULL;

hRes = pMotionStudy->GetResults( lStudyType, & pResults );

hRes = theRootComp->GetChildren( & vChildren );

// Iterate over the children of the root component of the ModelDoc, and over the duration of the animation

CComPtr<IComponent2> pComp; // From theRootComp->GetChildren( & vChildren ); above

double dRequestedTime; // Iterator, increase in small steps in the duration of the animation

hRes = pResults->GetLinearVelocity( dRequestedTime, pComp, &pReturnVV );

The returned MathVector in pReturnVV is always { 0.0, 0.0, 0.0 }. I get no error codes.

Anyone has any idea what I'm doing wrong?

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Hans Björk Jul 26, 2017 7:01 AM

I can add some neater psuedo-code if it help understand what I'm trying to do:

hRes = pModExt->GetMotionStudyManager( & pReturnObj );

CComPtr<IMotionStudyManager> pMotStuMgr;

hRes = pReturnObj->QueryInterface( __uuidof(IMotionStudyManager), (void**) &pMotStuMgr );

hRes = pMotStuMgr->GetMotionStudyNames( & vStudyNames );

for( bsName in vStudyNames )

	CComPtr<IMotionStudy> pMotionStudy = NULL;
	hRes = pMotStuMgr->GetMotionStudy( bsName, & pMotionStudy );

hRes = pMotionStudy->GetDuration( & dDuration ); // This is correct, accessing the animation works!

	hRes = pMotionStudy->Activate( & vbRet );
	hRes = pMotionStudy->Calculate( & vbRet );

	CComPtr<IMotionStudyResults> pResults = NULL;
	hRes = pMotionStudy->GetResults( swMotionStudyTypeAssembly, & pResults ); // Get the result for this Animation.
	hRes = pResults->IsOutOfDate( & vbIsOutOfDate ); // returns not out of date

	// Get components in the model...
	hRes = pRootComp->GetChildren( & vChildren );

	for( CComPtr<IComponent2> pComp in vChildren )

	for( double dIter=0.0; dIter <= dDuration+0.001; dIter += 0.1 )

hRes = pResults->GetLinearVelocity( dIter, pComp, &pReturnVV ); // Is this the correct component?

hRes = pVelocityV->get_IArrayData( & oaVelocity );

			Result: x == y == z == 0.0? Always, for all times and components, even out of bounds times
			The same for GetAngularVelocity() and GetCMPosition

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Hans Björk @ Hans Björk on Jul 27, 2017 4:53 AM

With a bit of experimenting I have found that only Motion Studies of type Motion Analysis return any values, but the same values for any value of time, regardless of how the components move. GetLinearVelocity, GetLinearAcceleration and GetCMPosition returns the same vector for all values of argument Time.

And if I ask for a IMotionStudyResult of type swMotionStudyTypeCosmosMotion from an IMotionStudy of type swMotionStudyTypeAssembly and then call GetLinearVelocity, SolidWorks crashes on the GetLinearVelocity call.

Obviously IMotionStudyResult does not even remotely work the way I had imagined after reading the documentation.

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	CComPtr<IMotionStudy> pMotionStudy = NULL;
	hRes = pMotStuMgr->GetMotionStudy( bsName, & pMotionStudy );

	hRes = pMotionStudy->Activate( & vbRet );
	hRes = pMotionStudy->Calculate( & vbRet );

	CComPtr<IMotionStudyResults> pResults = NULL;
	hRes = pMotionStudy->GetResults( swMotionStudyTypeAssembly, & pResults ); // Get the result for this Animation.
	hRes = pResults->IsOutOfDate( & vbIsOutOfDate ); // returns not out of date

	// Get components in the model...
	hRes = pRootComp->GetChildren( & vChildren );

	for( CComPtr<IComponent2> pComp in vChildren )

	for( double dIter=0.0; dIter <= dDuration+0.001; dIter += 0.1 )

			Result: x == y == z == 0.0? Always, for all times and components, even out of bounds times
			The same for GetAngularVelocity() and GetCMPosition

Hans Björk @ Hans Björk on Jul 27, 2017 4:53 AM
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With a bit of experimenting I have found that only Motion Studies of type Motion Analysis return any values, but the same values for any value of time, regardless of how the components move. GetLinearVelocity, GetLinearAcceleration and GetCMPosition returns the same vector for all values of argument Time.

And if I ask for a IMotionStudyResult of type swMotionStudyTypeCosmosMotion from an IMotionStudy of type swMotionStudyTypeAssembly and then call GetLinearVelocity, SolidWorks crashes on the GetLinearVelocity call.

Obviously IMotionStudyResult does not even remotely work the way I had imagined after reading the documentation.
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How to get information from an Animation with MotionStudyResult GetLinearVelocity

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