If-Then component

Just getting started with building a complex definition and can't find a component that I want. The need is to use a Boolean Toggle to switch an <If-Then> condition.

i.e. -> if toggle=true_then_(input A + input B), false_then_(input A)->C

I am used to doing this logic but don't know how to do it in Grasshopper. I'm certain this must be in there but no luck finding so far.

TIA

Robb

Replies to This Discussion

Permalink Reply by Hyungsoo Kim on January 31, 2015 at 1:44am

You can use simple script by using VB, C# or Python component.

Permalink Reply by Rana Rizi on February 2, 2019 at 7:50am

hello,

would you please tell me what the ''t'' is here?

thanks

Permalink Reply by David Stasiuk on January 31, 2015 at 2:07am

Scripting is very useful, but if you prefer you can also do if-then statements in an expression:

Permalink Reply by Pieter Segeren on January 31, 2015 at 2:27am

I was going to say this:

Ah I just did. Notice there is a search functionality in this site, I think this question plus it's anwers can be found in the FAQ too (it should be)

Permalink Reply by Robb McDougle on January 31, 2015 at 7:20am

Thanks for the reminder about search. I should have started there.

Permalink Reply by David Rutten on January 31, 2015 at 3:04am

There's also two components that were designed to create a conditional flow. Specifically, they allow you to run some data through one subnetwork, all other data through another, and then merge them again.

First you 'sift' your data into several streams. By default 2 output streams are available, meaning that the component will work out of the box with boolean values. Then you do stuff to the filtered data, finally you 'combine' them again.

I attached a file which shows how to only perform an operation on all the negative numbers in a list:

Attachments:

SiftCombine.gh, 11 KB

Permalink Reply by Robb McDougle on January 31, 2015 at 7:21am

This is way more than I need at present but really good to know about. Thanks David.

Permalink Reply by Julian Raxworthy on December 19, 2017 at 7:03am

I know this is an old discussion, but this was very useful for me using the boolean toggle.

How can I use the toggle to choose between one part of a definition versus another? For example, in the above If Toggle=True, run this part of the definition, versus if False, another? I thought dispatch might do it but I cant work it out... Or is it a gate??

Help would be appreciated!

Permalink Reply by Joe Curtis on February 12, 2019 at 12:14am

Thanks so much for this!! There were so many things that I learned by reconstructing it.

happy wheels

Permalink Reply by Robb McDougle on January 31, 2015 at 6:10am

That is just what I was looking for David Stasiuk... but the expression component in my version (.9.0076) only has 2 inputs on the left. Did your component come from somewhere else?

Permalink Reply by David Rutten on January 31, 2015 at 6:30am

Zoom in to add more inputs.

Permalink Reply by Robb McDougle on January 31, 2015 at 7:17am

Got it.