GH_Convert.ToGeometryBase: Surfaces recognized as BReps

Hello all,

I have a component where I need to convert Objects to GeometryBase and then check their ObjectType.

I have done this in the past but I have recently found that if I have pass an object that I know is a surface the resulting GeometryBase variable will have an ObjectType of a Brep....

What I really want to do is...

Dim myObject As Object = <some surface or brep>

Dim BaseObj As GeometryBase = Grasshopper.Kernel.GH_Convert.ToGeometryBase(myObject)

If BaseObj.ObjectType = Rhino.DocObjects.ObjectType.Surface Then

'do something to the Surface

Else If BaseObj.ObjectType = Rhino.DocObjects.ObjectType.Brep Then

'do something to the Brep

End If

If the object is a Surface, the above code will always do something as if it were a Brep so my two conditions won't work as expected.

Any suggestions?

-Nathan

Replies to This Discussion

Permalink Reply by Nathan Miller on May 20, 2012 at 5:04pm

I should also note, that I have other conditions in my component to determine if myObject is a point, curve, or mesh. These all work as expected...

The real hang up is differentiating between surfaces and breps with GeometryBase

-Nathan

Permalink Reply by Andrew Heumann on May 20, 2012 at 6:23pm

It's not the most elegant solution, but it might be an ok workaround:

Dim myObject As Object = <some surface or brep>

Dim BaseObj As GeometryBase = Grasshopper.Kernel.GH_Convert.ToGeometryBase(myObject)
Else If BaseObj.ObjectType = Rhino.DocObjects.ObjectType.Brep Then
Dim myBrep As Brep = BaseObj
If(myBrep.IsSurface)
'do something to the Surface
Else
'do something to the Brep
End If

End If

Permalink Reply by Nathan Miller on May 20, 2012 at 7:03pm

yeah... we'll go with that for now ;) Thanks!