Hi,

Trying to export a file from Maya to Motion Control via FBX.  When I try to get the rotation from the FBX camera it is coming in incorrectly.  The Maya camera rotation goes 180 to 0, the
Matx = lExportScene->GetEvaluator()->GetNodeGlobalTransform(lpNode, nowtime);
vect = Matx.GetR();
gives me -90 to +90 even though my scene is apparently KFbxAxisSystem::eMayaYUp.

If I re-import the FBX file into Maya it appears correct so it is something I am doing :-)

Does anyone know much about correcting for rotation orders?  A normal film camera is zxy meaning it pans, then tilts and then rolls.  Most CG camera are otherwise (xyz) and you cannot easily convert a film camera pan into a Ry if the rotation orders are different.

Simon

PS:

Tried several ways to get the Start and Stop frame of the animation. 

//trying to fill float *pSpeed, float *pStart, float *pStop from KFbxScene *lExportScene

// Get the frame rate = this seems to be fine
KFbxGlobalTimeSettings *lTimeSettings;
lTimeSettings = &lExportScene->GetGlobalTimeSettings();
KTime::ETimeMode lTimeMode = lTimeSettings->GetTimeMode();
double lFrameRate = KTime::GetFrameRate(lTimeMode);
fbxinfo_log("Using Global time settings gives a speed of %f\n”, lFrameRate);
*pSpeed = (float) lFrameRate;

lExportScene->GetGlobalTimeSettings().SetTimeProtocol(KTime::eFRAME);
lTimeSettings->GetTimelineDefautTimeSpan(MoveTimeSpan);

KTime SpanStart = KTIME_INFINITE;
KTime SpanStop = KTIME_MINUS_INFINITE;

SpanStart = MoveTimeSpan.GetStart();
SpanStop = MoveTimeSpan.GetStop();

SpanStart.GetTime(Hour, Minute, Second, Frame, Field, Residual);
// Start time in frames
*pStart = Frame + (Second + (Minute + (Hour * 60.0f)) * 60.0f) * lFrameRate;

SpanStop.GetTime(Hour, Minute, Second, Frame, Field, Residual);
// Stop time in frames
*pStop = Frame + (Second + (Minute + (Hour * 60.0f)) * 60.0f) * lFrameRate;

Isn’t there a better way or this the best?
I would have thought most platforms would deal in frames and it seems VERY laborious for such a needed function.  Tried GetFrame, but that never seemed to work correctly.

Hi Simon,

If I understand correctly, you have a node with rotation order XYZ that you would like to convert to ZXY.

I suggest using KFbxNode::ConvertPivotAnimationRecursive() in your FBX importer. This is how the code should look:

I don’t have time to test this code, so there might be some other adjustments to do: Keep me posted on your results.

Function ConvertPivotAnimationRecursive() is used to bake transform components: pre- and post-rotation, rotation and scale pivots and offsets - inside the standard transforms – Translation, Rotation, Scaling. It is very useful when importing a FBX file inside a system that does not support some of these properties.

Viviane
Autodesk FBX

Viviane Rochon
Maya Data Platform
Autodesk

Hi,

Further to my earlier posts, I have sorted out my rotation orders by getting the Quaternions and then using code to convert that to my rotation order which is “Pan, Tilt, Roll” like most films cameras.  I am somewhat surprised by the odd gimbal locks that occur when panning CG cameras, a film camera will standardly gimbal lock when looking straight up or straight down.  Then the roll (horizon) becomes an issue and I use a 3Node camera to solve that but it does not come up that much.

I am however having some very strange issues with GetStart and GetStop.  The values being returned are huge and look suspiciously un-initialised.  Start should be 0 and Stop a few tens of frames, but I am getting tens of thousands…

I follow the ViewScene app as far as I can see, but when I call

gCurrentAnimationStack =lExportScene->FindMember(FBX_TYPE(KFbxAnimStack), gAnimStackNameArray[pItem]->Buffer());
gCurrentAnimationLayer = gCurrentAnimationStack->GetMember(FBX_TYPE(KFbxAnimLayer), 0);
lExportScene->GetEvaluator()->SetContext(gCurrentAnimationStack);
lCurrentTakeInfo = lExportScene->GetTakeInfo(*(gAnimStackNameArray[pItem]));

KTime SpanStart = lCurrentTakeInfo->mLocalTimeSpan.GetStart();
KTime SpanStop = lCurrentTakeInfo->mLocalTimeSpan.GetStop();

I get SpanStart mTime=0x0000cdcdcd010000
and SpanStop mtime=0xd7b000000000000

from the humanoid.fbx sample file, needless to say ViewScene works fine.

I could post more code, but I didn’t want to bore you endlessly, any pointers would be appreciated.

Thanks

Simon
PS: Why the typo GetTimelineDefautTimeSpan(..);

Hi,
That doesn’t work either, I still get strange values.  If I look at my Scene pointer, the mGlobalTimeSetting member looks corrupt right from the InitializeSdkObjects(..) compared to ViewScene, so there must be something more basic out…
Thanks for the suggestion though :-)
I have built a simple console app that works and the pSdkManager and lExportScene seem to be fine, in my not-working scene, these pointers are apparently valid but contain some odd values (a lot of cdcdcd) See attached jpgs.  I can only imagine it is a mistake on the #defines or the linking or sthg, but as far as I can see the projects are identical in these regards.