Polar Array using C#?

Grasshopper Developer
1

I’m not shearing if Grasshopper section is the correct place to put a C# question. But I’m trying to optimise my Grasshopper graph migrating slowly to C#. This is my first script and is working using text. The API I was able to find was in VB. Where I can find info about API PolarArray and how to implement it? Is it posible an example?

The C# script with multiple surface brep will run faster than Grasshopper?

Brep myBrep = null;
if (!DA.GetData(0, ref myBrep)) return;
Brep myNewBrep = myBrep;
// Code here…PolarArray
DA.SetData(0, myNewBrep);

MyProject1_FirtTest.gha (6 KB)

2

Hi @AlanMattano,

The ArrayPolar command uses a rotation transformtion, or Transform.Rotation, to transform objects from one location to another.

– Dale

3

If you are just rewriting a single gh component (polar array in this case) chances are it won’t be faster (unless you are doing something special like multi-threading), most likely it will be the same or slower since the gh components are written in c# already. What you can make faster is larger processes, for instance maybe you have a process that takes 10 components, you can write that process as one component, in that case you can make things faster usually depending on how well your coding is.

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4

Thx Michael 4 answering!

This is argument for a new tread but If I make a “cluster” of 10 components looks like is not the same as fast as writing that 10 into C#. Is there a way in Grasshopper to make a build, bake or a compiler that takes that group of components or cluster and create a .gha or .dll automatically? Usually graph tools like this one has this final compiler option. Is a Cluster as fast as C#? Do I has to code in C# manually? Is it missing in the workflow a final compiler with data oriented optimized machine code?

5

A cluster will not be faster, often it is slightly slower than even the gh definition. As far as I know there is no way to automatically make a cluster into a script, mainly because the logic of the script would be different due to having the ability to loop etc.

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6

Still I do not get it. Is my first time scripting using Rhino API and I did not understand how to use the Transform class from Geometry with Brep.
myBrep.Rotation(…is not possible
Do myBrep has a Transform?
There is a
myBrep.Rotate
After creating angleRadians, rotationAxis and rotationCenter can you give me an example how to use
Transform.Rotation together with Brep?

7

You need to create the Transformation to use.

You can create the transformation first, then use it like this:

Transform rotate = Transform.Rotation(yourAngle, yourVector, yourPoint);
yourBrep.Transform(rotate);

or you can create the transformation in the transformations execution like this:

yourBrep.Transform(Transform.Rotation(yourAngle, yourVector, yourPoint));

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