Hi guys, I’m trying to build a Grasshopper Component in C# that implements an optimization algorithm (RBF-optimization, if you are curious). I have the optimization algorithm as a Python library and want to build an interface around it. As a first step, I’m trying to figure out how to get a Number…

FixValue is not the right method to call, that method merely fixes the assigned value (i.e. it makes sure it doesn’t exceed the limits and adheres to the correct rounding scheme). The problem you have is actually three-fold: Get references to all sliders you want to change. Change all slider valu…

[image] ParamDesSing: Sorry, but what do you mean with the component being “inert”? And how do I make it so? Most components do things. They consume some sort of input data and then compute new output data. This makes them an integral part of a solution. When an object changes it expires all …

Addendum: My worry is that if your component expires because it is causally connected to a slider, and this slider is changed as part of the component solution, a vicious cycle may start where the slider and the component expire each other in a never ending loop.

Here’s an idea: Why don’t I make a separate component, just to have the params connect to it? The parameter component can maintain a list of the number sliders. The solver components find the parameters component, and gets the GUIDs of the number sliders from there. In that way, the solver compo…

[image] DavidRutten: GH_NumberSlider slider = param as GH_NumberSlider; Hey David, I can’t find a GH_NumberSlider in the SDK. There’s only GH_Slider and GH_SliderBase. Are they the same thing? Which one is the right one? Thanks, Thomas

Nevermind, I found it: Grasshopper.Kernel.Special.GH_NumberSlider

GH_SliderBase is the core class for sliders. It contains almost all the logic, but it is not tied to a specific interface element. GH_Slider is the implementation of GH_SliderBase on a winforms control. GH_NumberSlider is the implementation of GH_SliderBase as a canvas object.

Hi all, The information in this post is really useful and helped me to do the same thing. However, this strategy results in a GH breakpoint ‘An object expired during a solution’ which makes sense (as David pointed out, ’ a vicious circle’ is created). The good thing is that this solution works if y…

If you want to affect the solution using data from the current solution, it’ll simply have to wait until the next one. The best way of doing is is to create a schedule and register a callback: GH_Document.ScheduleSolution(1, callbackDelegate) This means that 1 millisecond after the current solutio…

Hi David, I’m having a problem with the plug-in that I’m building and Archsim. The plug-in resets the number sliders and then starts a new solution: GH_Document.NewSolution(false, GH_SolutionMode.Default); The problem is that, at this line in the code, Rhino crashes. Using Archsim with Galapago…

When you say crash, is there an error message?

How can I get a Number Slider object and set a value?

Grasshopper Developer

0000d_ddd (0000d ddd) January 19, 2026, 9:23pm 30

I have a similar problem and am curious if anyone was able to get this working in the most basic manner for Python 3??

This is the post I just made Python 3 controlling a Number Slider

Thanks in advance,

Andres

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How can I get a Number Slider object and set a value?

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