Detecting whether input values have been cleared or not

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Permalink Reply by David Rutten on June 2, 2015 at 8:09am

If you clear values then the parameter will be empty. Empty mandatory parameters will short-circuit the component snd SolveInstance will indeed not be called. If you want SolveInstance to run even if the parameter is empty, then you must make the parameter optional. You should do this in RegisterInputParams

pManager[i].Optional = true;

Permalink Reply by MalacPauk on June 3, 2015 at 1:14am

Thanks for the response!

Is there a way to detect it inside the code, when those mandatory empty parameters short-circuit the component? From the outside it's visible, as it turns orange, and that is also what I need. Making the parameter optional gets me into SolveInstance, but I need some way to signal it when a parameter is expected. How can I make the component go orange?

Permalink Reply by William Carroll on June 2, 2015 at 9:53am

While we're on the topic of how the Grasshopper solver and other under-the-hood mechanics of GH operate, is there any documentation available on this subject? Or is most of the information decentralized and scattered throughout the forum in the form of comments from David and other users? Something as simple as a diagrammatic overview of the feedback loop of the solver could be very helpful.