Creating a default value for a GHPY compiled component

Grasshopper Developer
, ,
4

Hi Marco @mp1

I moved the conversation to a new topic, so it might be useful also to other users.

OK; then it makes sense.

We need to dig a little deeper into the Grasshopper SDK. Here is how:

def RegisterInputParams(self, pManager):
    p = Grasshopper.Kernel.Parameters.Param_String()
    self.SetUpParam(p, "matName", "matName", "Name of the material.")
    p.Access = Grasshopper.Kernel.GH_ParamAccess.item
    p.SetPersistentData(Grasshopper.Kernel.Types.GH_String("Test"))
    self.Params.Input.Add(p)
    
    p = Grasshopper.Kernel.Parameters.Param_Number()
    self.SetUpParam(p, "E", "E", "Young's Modulus [MPa].")
    p.Access = Grasshopper.Kernel.GH_ParamAccess.item
    p.SetPersistentData(System.Array[float]([42.0]))
    self.Params.Input.Add(p)

There’s nothing bad at treating None as a particular value. Python has the feature of null values also for numbers.

I hope this helps,
Thanks,

Giulio

–
Giulio Piacentino
for Robert McNeel & Associates
giulio@mcneel.com

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