Grasshopper

algorithmic modeling for Rhino

Assigning Lists to outputs in 0.9+

Dear GHA developers,

As mentioned previously, there is a bug that cannot be solved with a minimal approach to assigning lists vs. items to component output parameters. Always assigning a null/Nothing list before returning is one way to solve this problem, but the next release of Grasshopper has overloads for Register_XXXXParam() methods inside the RegisterOutputParams() method. It is now possible to assign an access value to outputs and this access flag is taken into account by the data matching algorithms.

So by specifying the access type right at the start, you won't have to worry about assigning lists any more.

protected override void RegisterOutputParams(

              GH_Component.GH_OutputParamManager pm)
{
  pm.Register_XXXXParam("blah", "b", "blah", GH_ParamAccess.list);
}

Once 0.9.0001 goes out you will be able to modify your code to use these overloads. Note that this is not a breaking change, components will continue to behave as they did before (actually, hopefully slightly better than before), but adding access flags inside RegisterOutputParams will be considered good manners.

--

David Rutten

david@mcneel.com

Poprad, Slovakia

Views: 684

Replies to This Discussion

Permalink Reply by Tyler Selby on May 15, 2012 at 9:22pm

Any thoughts on how far out (days vs weeks) the next release of GH will be?  

Permalink Reply by David Rutten on May 16, 2012 at 1:50am

I really hope I'll be done in 2~3 weeks, but there's still a lot of stuff with Clusters that needs to be done before then.

--

David Rutten

david@mcneel.com

Poprad, Slovakia

Permalink Reply by Tyler Selby on May 16, 2012 at 11:54pm

I look forward to the next release.  

Permalink Reply by David Rutten on May 17, 2012 at 3:27am

Me too :)

--

David Rutten

david@mcneel.com

Poprad, Slovakia

Permalink Reply by Rémy Maurcot on May 17, 2012 at 11:58am

Me to, david good works !

Grasshopper is so fantastic...

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