[Smtk-developers] Bridges and descriptive phrases

[Yumin Yuan]

Dave,

I have something working, and also have something "crashing" inside cgm.

Things work for:
* one bridge session with multiple read operators: each model from "read"
will show as children of  the same "bridge session". This works for both
cgm and discrete bridges.
* For cgm bridge, after "read", the "create prism/sphere" will work ONLY if
I start a new bridge-session, which means the "prism/sphere" model will
show as children of the New session.

The following will crash inside cgm:
* For cgm bridge, after "read", the "create prism/sphere" will crash inside
cgm if I use the same bridge-session of "read", and I verified that
GeometryModifyTool::instance() was NOT null. Here is the trace of crash ...
(It doesn't seem to help)

Exception Type:  EXC_BAD_ACCESS (SIGSEGV)
Exception Codes: EXC_I386_GPFLT

Thread 0 Crashed:: Dispatch queue: com.apple.main-thread
0   libcgm.0.dylib                 0x000000011ec78754
GeometryModifyTool::prism(double, int, double, double) + 214
1   libcgmSMTK.dylib               0x000000011e992972
smtk::bridge::cgm::CreatePrismOperator::operateInternal() + 1730
(CreatePrismOperator.cxx:81)
2   libSMTKCore.dylib             0x00000001074b9229
smtk::model::Operator::operate() + 137 (Operator.cxx:74)
3   libModelBridge_Plugin.dylib   0x0000000107b6677a
vtkModelManagerWrapper::ProcessJSONRequest() + 6522

Thanks,
Yumin

On Fri, Nov 7, 2014 at 9:30 PM, David Thompson <david.thompson at kitware.com>
wrote:

> Hi Yumin,
>
> I've merged in some code that goes a little further than what we talked
> about as far as displaying bridge sessions in the Qt tree view. Instead of
> just adding a new subclass of DescriptivePhrase, I made bridges entities
> just like ModelEntity, Face, Edge, etc.
>
> There is a new class, smtk::model::BridgeSession, that is a Cursor
> subclass. You can get an array of all the bridge sesssion in a Manager with
>
>     smtk::model::Manager::Ptr mgr;
>     BridgeSessions sessions = mgr->allSessions();
>
> and it will list models assigned to it:
>
>     ModelEntities models = sessions[0].models();
>
> This is used to present models as children of bridge sessions in
> DescriptivePhrase hierarchies. The BridgeSession class also provides some
> convenience methods for accessing bridge information. See
> smtk/bridge/cgm/testing/python for some examples.
>
> Please let me know if you have any problems using this to present bridges
> in the Qt tree view in ModelBuilder.
>
>         David
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