[Insight-developers] Problem with LabelMap and negativ spacing

[Carsten Kendziorra]

Hello,

I'm using a itk::BinaryImageToShapeLabelMapFilter to create a 
itk::LabelMap and take afterwards a an object:

itk::LabelMap::LabelObjectType* labelObject = 
labelMap->GetNthLabelObject(LabelNumber);

Unfortunately
labelObject->GetEquivalentEllipsoidDiameter()
returns [-nan, -nan, -nan], if the spacing of the BinaryImage is 
negative. Everything works fine for positive spacing.

Is negative spacing not allowed here? Or how to deal with negative spacing?

Thanks for any help!
Carsten