OnBox in VB

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Permalink Reply by Vicente Soler on August 18, 2009 at 1:03am

Try EH_Box:

Dim e As New Grasshopper.Kernel.Types.EH_Box(onutil.On_xy_plane, 10, 10, 10)
a = e


Permalink Reply by kermin chok on August 18, 2009 at 8:22am

Vicente,
I'm starting to see that in VB, you can mix native grasshopper components and native Rhino parts. Is there documentation to know which native grasshopper components are accessible from VB?

For example, this EH_Box feature is available and works but I don't see the equivalent for "Cylinders". We had to resort to native Rhino ONCylinder to draw it.

Any thoughts?

Permalink Reply by Rajaa Issa on August 18, 2009 at 8:44am

Hi Kermin,

The following does display fine at my end:

Sub RunScript(ByVal corners As List(Of On3dPoint))
Dim box As New OnBrep
box = OnUtil.ON_BrepBox(corners.ToArray)

A = box
End Sub

Permalink Reply by kermin chok on August 18, 2009 at 9:13am

Rajaa,
Thanks. That works.

I guess the bigger question would be how do we know when to use OpenNurbs objects (referencing the .Net SDK), Grasshopper objects (Grasshopper.Kernel.Types) or OnUtil. geometry objects?

Any guidance?

Thanks again.

Permalink Reply by Rajaa Issa on August 18, 2009 at 11:01am

Hi,
Grasshopper types still not documented properly for efficient use. This will be coming at some point. In general I'd use GH types when they are not available in OpenNURBS (for example the data tree). GH does the casting internally for ON types.

OpenNURBS has all geometry classes/types. You can use them to create geometry of that type, but you need to know which method to use to set the member variables properly. In more comlex geometry, like a box, edge surface, etc, there are functions in the SDK that does it for you. These functions are under one of 2 name spaces. RhUtil and OnUtil. It takes a bit of digging and asking around to see which is most appropriate in each case.

I hope this helps.