How can I invoke a component of grasshopper by C#?

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Permalink Reply by David Rutten on February 8, 2012 at 2:17pm

Hi Andrea,

what do you mean exactly? Do you want to create a new Populate2D component on the canvas? Do you want to use the functionality inside Populate2D? 

It's possible to instantiate a GH_Component if you know the ID and then it's possible to add data to its input parameters, call the SolveInstance() method and harvest data written to outputs. Note however that some components require that they are part of a document.

--

David Rutten

david@mcneel.com

Poprad, Slovakia

Permalink Reply by Andrea Lu on February 8, 2012 at 2:51pm

Ciao David!

for example:

private void RunScript(rectangle rec, int num, int ranseed,ref object A)//i write it by hand,may be something wrong
{
    Arraylist <Point3d> mypoints=pop2d(rec,num,ranseed);  //get the points generated by pop2d    

    A=mypoints                                                                                          

}

i know the code is wrong, but i believe you can understand me, can you tell me how to do it in the right way?

Thank you very much!

Permalink Reply by David Rutten on February 8, 2012 at 3:38pm

Well, sometimes a component is almost empty as the function is available as a .NET framework function or a Rhino/Grasshopper SDK function. That's not the case with Populate2D, most of the logic is inside the SolveInstance function, so you're going to have to call that function. 

Wait, stop the presses. I just realised SolveInstance is a protected method, so you can't call it. It's a bit late today, but tomorrow I'll see if I can come up with some form of SDK function that makes it easier to call Component logic from the outside.

--

David Rutten

david@mcneel.com

Poprad, Slovakia

Permalink Reply by Andrea Lu on February 8, 2012 at 3:47pm

Thank you,David!