Selecting sub components from ON::instance_reference

Rhino Developer
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1

Hi,

I try to select an ON::Curve inside an ON::instance_reference. I have the object UUID and the ON_COMPONENT_INDEX from the curve. My code works when selecting curves inside breps, but I can not select any subobject from an instance_reference.

I tried using “obj->SelectSubObject(index, true, true, true);” and also the following code:

obj = CRhinoObject::FromId(0, uuid);
const CRhinoInstanceObject* iref = CRhinoInstanceObject::Cast(obj);
const CRhinoObject* sub_obj = iref->SubObjectFromComponentIndex(index); (I get an ON::Curve object here)

sub_obj->Select(true, true);

But none of this works. Are there any hints how to select a subobject of an instance_reference?

I use this as a preselection for a “CRhinoGetObject” so the User can change his previous selection.

Thanks,
Daniel

2

Hi @Daniel_kronos,

Here is some sample code that might be helpful. Holler if it’s not.

cmdTestDanialKronos.cpp (2.4 KB)

– Dale

4

My code still not works as intended. I think I was on the wrong path here.
The selection works, but when starting a CRhinoGetObject afterwards, the selection inside the instance_reference is not preselected in the CRhinoGetObject.

First I select the object from my stored uuid and component index. This works as inteded

context.m_doc.UnselectAll(); //To make sure nothing old is selected
obj = CRhinoObject::FromId(0, uuid);
obj->SelectSubObject(index, true, true, true);
context.m_doc.Redraw();

Then I start the CRhinoGetObject and the selection of the curve inside the instance suddenly disappears. This code works for curves that are not in any object and curves in Breps. When I let this run in a debugger, the curve stays selected until “gc.GetObjects()” starts.

// setup GetObject
CRhinoGetObject gc;
gc.SetCommandPrompt(prompt.c_str());
gc.SetGeometryFilter(geometry_type_filter);
gc.SetGeometryAttributeFilter(geometry_attribute_filter);
gc.EnableSubObjectSelect(true, true);
// options required to include pre-selected objects from uuid-list
gc.EnableClearObjectsOnEntry(false);
gc.EnableUnselectObjectsOnExit(false);
gc.EnableDeselectAllBeforePostSelect(false);
gc.EnableAlreadySelectedObjectSelect(true);

gc.GetObjects(min_objects, max_objects);

Finally I process the Objects… But the preselected curve never arrives here :frowning:

// deselect all objects in the end
context.m_doc.UnselectAll();

for (int i = 0; i < gc.ObjectCount(); i++) {
    //process the selected objects
}

Thanks Daniel

5

Hi @dale,
do you have any other Ideas how to solve this?

Thanks, Daniel