GUID generation in python

[keerthana]

Hi
I’m trying to create á GUID for my geometry before i bake it so i can retrieve it later for further operations

I found this very clear example in Visual Basics

Creating GUIDs

However i’m unsure how to get this working in python due to my lack of knowledge of VB

Thanks in advance

[Dancergraham (Graham Knapp)]

Hello,

If you just need a unique identifier then you can use the uuid module in Python:

import uuid

my_uuid = uuid.uuid4()

I’m not sure how you would then attach it to your geometry…

[lando.schumpich]

Here is one way of doing this:

[csharp] Create 3d object set user text with object's guid as value

Bonus: Here is how you can add an object to the rhinodoc using an guid of your choice via ObjectAttributes.ObjectId. import Rhino import System import scriptcontext as sc def addGuidFieldToUserText(): # any line, doesn't matter line = Rhino.Geometry.Line(Rhino.Geometry.Point3d.Origin, Rhino.Geometry.Point3d(20, 20, 0)) # create new guid id = System.Guid.NewGuid() # create new attributes attributes = Rhino.DocObjects.ObjectAttributes() # set you…

[Will_Wang]

I’m not sure if Grasshopper’s bake action gives you the opportunity to specify Guid. However you can “bake” straight from GhPython.
You need to get to the ObjectTable of the current RhinoDoc, call the appropriate add method such as this one, then provide an ObjectAttribute whose ObjectId property is set to your desired Guid.
Of course remember to switch scriptcontext.doc from ghdoc to ActiveDoc and back.

forum-guidbake.gh (7.3 KB)

[piac (Giulio Piacentino)]

@keerthana

I’m trying to create á GUID for my geometry before i bake it so i can retrieve it later for further operations

The VB example is to create Guids for other purposes. Rhino takes care of Guid creation for you, and you cannot choose the Guid of the added object. However, once the object is added to the document, Rhino informs you of the Guid value that it assigned to the geometry. Example:

https://developer.rhino3d.com/api/RhinoCommon/html/M_Rhino_DocObjects_Tables_ObjectTable_Add.htm

@Will_Wang is showing a good example for this.

[lando.schumpich]

@piac

and you cannot choose the Guid of the added object

Just to be sure: You can choose the Guid of the added object, like i’ve shown in the linked example from an older thread above, by setting the Atrributes.ObjectId property and adding to the RhinoDoc with Attributes.

If the Guid assigned doesn’t really matter and just holding on to it is important, I agree @Will_Wang’s solution is the way to go.

[piac (Giulio Piacentino)]

@lando.schumpich

You can choose the Guid of the added object

Yes, just make sure that the Guid is not already present. Specs. If you want to code this way, you need to check if the Guid is present.

[Will_Wang]

what will happen if an object with the same Guid is already in ObjectTable?
old one gets bumped? new one never added?

[Helvetosaur]

@Will_Wang

what will happen if an object with the same Guid is already in ObjectTable ?

The universe as we know it will suddenly cease to exist as the second GUID tries to materialize in the same space/time as the first, creating a gigantic GUID-AntiGUID explosion…

[Will_Wang]

and no one has done this?
hold my beer…

[piac (Giulio Piacentino)]

@Will_Wang

what will happen if an object with the same Guid is already in ObjectTable ?
old one gets bumped? new one never added?

If the value is not null but it is already used by another object in the model, a new Guid is created.