How to get instance visibility when its ON::idef_object

elghorrim.sara · May 26, 2020, 5:05pm

Hi, I’m reading a 3dm file, but have some instance visible that should not be. how can i get an object visibility, while model_geometry->Mode() == ON::idef_object ?
Thanks in advance.
#C++

John_Brock · May 26, 2020, 6:30pm

Moved to Developer category.

elghorrim.sara · May 26, 2020, 6:45pm

thanks

dale · May 26, 2020, 7:22pm

Hi @elghorrim.sara,

Check the model geometry component’s attributes, ON_3dmObjectAttributes::Mode() to see if it’s visible or not.

You might also check to see if the layer the object resides on is on or off.

– Dale

elghorrim.sara · May 27, 2020, 9:02am

Hi Dale, thanks for your reply,

Yes i did extract model geometry component attributes, and its mode is : idef_object, the layer is visible.

elghorrim.sara · May 27, 2020, 9:19am

is there another thing that i should check, or it means that the geometry should be visible
?

dale · May 27, 2020, 3:21pm

Hi @elghorrim.sara,

If ON_3dmObjectAttributes::Mode() returns ON::idef_object, then the object is part of an ON_InstanceDefinition. An ON_InstanceDefinition defines the geometry used by instance references.

You can also use ON_3dmObjectAttributes::IsInstanceDefinitionObject() to determine if an object is part of an instance definition.

If you open the file in Rhino, you won’t see instance definition objects, as they make up instance definitions. Rhino’s Insert command lets you insert an instance of this definition, what we call an instance reference, or ON_InstanceRef.