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We’ll now create a very simple custom type. GH_Goo has several abstract methods and properties which must be implemented, but a lot of the other methods are already implemented with basic (though usually useless) functionality. GH_Goo is a generic type (that’s what the “ ” bit means), where T is the actual type you’re wrapping. It is good practice to inherit from the abstract class GH_Goo, as it takes care of some of the basic functionality. The GH_Goo abstract classĪlthough all data in Grasshopper must implement the IGH_Goo interface, it is not necessary to actually write a type from scratch.
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The ScriptVariable() method allows a data type to provide a stripped down version of itself for use in a Script component. When data is fed into a VB or C# script component, it is usually stripped of IGH_Goo specific data and methods. See the Grasshopper Data Types guide for more information on conversion. It also unfortunately means you have to be “intelligent” when implementing this function. This allows the function to operate “intelligently” on data types.
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The CastTo() method is a generic method, meaning the types on which it operates are not defined until the method is actually called. The CastTo() function is responsible for step 1.
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Failing that, if implements IGH_Goo, it is asked whether or not it knows how to construct itself from an instance of. If implements IGH_Goo, then it is asked if it knows how to convert itself into an instance of. Two conversion (casting) attempts will be made in order to change into. But instead of playing nice, we provide data of type. Lets assume that we have a Component that operates on data type. It basically allows data types defined in Grasshopper add-ons to become an integral part of Grasshopper. IsValidįunction CastTo(Of T)(ByRef target As T) As Booleanĭata Casting is a core feature of Grasshopper data. IGH_Goo defines the bare minimum of methods and properties for any kind of data before it is allowed to play ball. What they’re for, who uses them at what time, etc, etc.Īll data used in Grasshopper must implement the IGH_Goo interface. In this section I’ll briefly discuss all the methods and properties that are defined in IGH_Goo. Please start with the Your First Component guide and the Simple Component guide before starting this one.īefore you start, create a new class that derives from _Component, as outlined in the Simple Component guide. We will not be dealing with any of the basics of component development in this guide. However, the parameters in Grasshopper don’t directly store Booleans, String, Points and Breps as these types can’t handle themselves in the cauldron that is Grasshopper. For example System.Boolean, System.String, 3d and to name but a few. NET Framework type or a RhinoCommon type. Practically all native data types in Grasshopper are based either on a. In this topic I’ll only talk about non-geometric data, we’ll get to previews and baking in a later topic. Grasshopper needs to be able to (de)serialize data, display data in tooltips, convert data to other types of data, prompt the user for persistent data, draw geometry preview data in viewports and bake geometric data. It’s a rather complicated topic as data is an integral part of the Grasshopper process and GUI. This guide discusses how Grasshopper deals with data items and types.