Hello Carlo,
Carlo Orru wrote:
> Thanks a lot for your precious pieces of advice!
>
> The Framework developement is going on, but I'm facing problems when I
> have to deal with multifields inside a field container.
> As you may know, in my framework there are three kinds of control points:
> 1 - Control Points containing a single field (i.e.
> ControlPoint<SField<Vec3f>>)
> 2 - Control Points containing a multi field (i.e.
> ControlPoint<MField<Vec3f>>)
> 3 - Control Points containing the whole field container (i.e.
> ControlPoint<ComponentTransformPtr>)
>
> In the first two cases everything seems to work fine, while in the last
> one I have a problem with multi fields.
> Here's how things work when I interpolate between two control points
> containing a FieldContainer:
^^^^^
typo? did you mean FieldContainerPtr ?
> // 'size' is the number of fields to deal with.
> // 'fc_ptr_dst' is the field container to be updated.
> // 'fc_src0' and 'fc_src1' are the field containers held inside the
> two controlpoints to interpolate between.
> // 'TypeIdentifier' is a class containing a
> 'FieldValueInterpolator<>' object for every kind of datatype.
>
> TypeIdentifier* ti = TypeIdentifier::Instantiate();
>
> for ( Int32 i = 0 ; (UInt32)i < size ; i++ )
> {
> f = fc_ptr_dst->getField(vID[i]);
> f0 = fc_src0->getField(vID[i]);
> f1 = fc_src1->getField(vID[i]);
>
> FieldValueInterpolatorBase* fvib =
> ti->getFieldValueInterpolator(f->getType().getId());
> if ( fvib == NULL ) continue ;
> fvib->updateField(ratio, f0, f1, fc_ptr_dst, vID[i], int_type);
>
> }
>
> Since multifields inside a field container are stored as singlefields of
> 'FieldContainerPtr' type,
Sorry, I don't understand what you are trying to say in this last
sentence and verbatim it is not correct. There are SFFieldContainerPtr
as well as MFFieldContainerPtr and for all things derived from
FieldContainer, i.e. SF{SomeContainer}Ptr and MF{SomeContainer}Ptr.
> and I get a field via the getField() method,
> how am I supposed to know if I'm dealing with a FieldContainer or not ?
> I have tried with
> f->getContentType().isDerivedFrom(FieldContainer::getClassType()) and
> f->getType().isDerivedFrom(FieldContainer::getClassType()),
> but they both seem to return FALSE even if 'f' actually IS a
> FieldContainer (i.e. a GeoPositionsPtr)...
yes, this is an unfortunate deficiency of the type system, the pointers
do not mimic the inheritance hierarchy of the containers. The workaround
that is used in a couple of places in the system is to check if the
typename ends with "Ptr". This is somewhat ugly, but works in practice
pretty well.
> Notice that everything works fine when it is known which multifield is
> to be dealt with, because the right fieldcontainer is supplied to the
> AnimationController at compile time!
Hope it helps,
Carsten
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