Add Block Instance into file

Rhino Developer
1

Good afternoon sirs!

I’m currently experimenting on how I can exchange information from rhino to python and the other way arround. So I was testing how to write a block instance into a 3dm file.
Here is what I coded so far:

    success, block = check_block_in_file3dm(True, block_name, rhino_file3dm)
    rhino_layer = Rhino.DocObjects.Layer()
    rhino_layer.Name = 'objects'
    rhino_layer.Color = System.Drawing.Color.FromArgb(0, 227, 144)
    file3dm.AllLayers.Add(rhino_layer)
    rhino_object_attributes = Rhino.DocObjects.ObjectAttributes()
    rhino_object_attributes.LayerIndex = rhino_layer.Index
    rhino_object_attributes.Name = block_name
    xform = rg.Transform()
    xform.M03 = 1
    xform.M13 = 1
    xform.M23 = 0
    file3dm.Objects.AddInstanceObject(block.Index, xform, rhino_object_attributes)
    file3dm.Write("test_exports/test-export-to-rhino.3dm", 6)

Where check_block_in_file3dm(True, block_name, rhino_file3dm) is:

def check_block_in_file3dm(prev_success: bool, block_name: str, file3dm):
    success = False
    block = None
    all_blocks = file3dm.AllInstanceDefinitions
    for b in all_blocks:
        if b.Name == block_name:
            success = True
            block = b
    return(success, block)

The ‘block’ variable used is a valid InstanceDefinitionGeometry and the code runs without erros, but the 3dm file created has no objects in it. Any ideia on where the problem is?
I guess that I still don’t understand how to add InstanceObjects into a document.

Thank you.

2

Hi @thomas.takeuchi,

Do you really need to write an instance definition to a 3dm file? Doing so will cause Rhino to created a nested block upon insertion.

– Dale

3

Hello @dale, thank you for the reply!

The idea was to have a central file, template, with all needed blocks, like so:

image
image1333×750 99.8 KB

And then, when needed, place one of those blocks into a new, empty, file.
Would there be another way to achieve the same intented objective?

-Thomas

4

Imo a better way would be to store every block as a single file and just insert each file as you need it. You can script the insert command or do it with rhino common.

5

Hello rgr,

Thank you for replying. Could you give me an example on how I could do that?
Is there an Insert Method in Rhino Common?

-Thomas

6

Hi,
Maybe have a look at this thread:

7

Basicly what you are doing is a) using the RhinoScript Method
oe b) see the link @jeffoulet just posted.

8

Thank you very much @rgr @jeffoulet!
I’ll definitely try that!

-Thomas

9

Hello guys, I just now realised that I never gave you a followup to my issue.
Taking your advices, I manage to acomplish what I wanted, wich was to load all blocks from a reference file3dm into a target file3dm.
I’m sure that this will be helpful to someone in the future so here is how I did it:

def explode_block(
file3dm_objects: File3dmObjectTable,
block: InstanceDefinitionGeometry,
) -> IEnumerable:
        """
    Explode a block into its composing elements
        Parameters
        ----------
        file3dm_objects
            A reference file3dm containing the block to be exploded
        block
            A block to explode

        Returns
        -------
        block_elements
            An Enumerable list of composing elements from exploded block
    

        """
        block_elements = List[Rhino.Geometry.GeometryBase]()
        for obj_id in block.GetObjectIds():
            if obj_id is not None:
                obj = file3dm_objects.FindId(obj_id).Geometry
                block_elements.Add(obj)

        return IEnumerable(block_elements)


def load_all_blocks_from_file3dm(
file3dm_src: File3dm,
file3dm_tgt: File3dm,
) -> File3dm:
        """
        Load all blocks form a source File3dm into a target File3dm
        Parameters
        ----------
        file3dm_src
            A source file3dm containing all blocks to be loaded
        file3dm_tgt
            A target file3dm where the blocks will be loaded

        Returns
        -------
        file3dm_tgt
            A modified file3dm with all blocsk loaded from reference file

        Notes
        -----
        For now, it only works with block that are not composed out of
        other blocks
        For that purpose it is necessary to add recurssion to function

        """

        all_blocks_src = file3dm_src.AllInstanceDefinitions
        all_objects_src = file3dm_src.Objects

        for block in all_blocks_src:
            file3dm_tgt.AllInstanceDefinitions.Add(
                block.Name,
                block.Description,
                Plane.WorldXY.Origin,
                explode_block(
                    all_objects_src,
                    block,
                ),
            )

        return file3dm_tgt
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