Mesh-to-hatch converter

coditect · April 25, 2021, 6:36pm

Colored meshes work brilliantly for displaying graphical data from Grasshopper. However, they cannot be exported as vector graphics for use in programs such as Adobe Illustrator. To get around this limitation, I wrote a script that converts a Ladybug mesh to a collection of colored hatches, which Rhino’s vector exporter handles just fine. Would a component with this functionality be a useful addition to Ladybug?

chris · April 25, 2021, 8:35pm

Hi @coditect ,

Thanks for the post and we already have a component that does the translation from mesh to hatch in Legacy:

If you think that this will be useful, we can put an updated version of it into the new LBT plugin. All of the code that uses the Rhino SDK should go into the ladybug-rhino library, though. I think a function under the bakegeometry module would be most appropriate:

github.com

ladybug-tools/ladybug-rhino/blob/master/ladybug_rhino/bakegeometry.py

"""Functions to bake from Ladybug geomtries into a Rhino document."""

from .fromgeometry import from_point2d, from_mesh2d, from_point3d, from_mesh3d, \
    from_face3d, from_polyface3d

try:
    import Rhino.RhinoDoc as rhdoc
    import Rhino.DocObjects as docobj
    doc = rhdoc.ActiveDoc
except ImportError as e:
    raise ImportError("Failed to import Rhino document attributes.\n{}".format(e))


"""____________ADD GEOMETRY TO THE RHINO SCENE____________"""


def add_point2d_to_scene(point, z=0, layer_name=None, attributes=None):
    """Add ladybug Point2D to the Rhino scene."""
    pt = from_point2d(point, z)
    return doc.Objects.AddPoint(pt, _get_attributes(layer_name, attributes))

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coditect · April 26, 2021, 5:28pm

I didn’t know that existed! I’ll work on porting it to Ladybug Tools over the next week or so.

OlivierDambron · September 8, 2021, 3:07pm

hi @coditect

did you manage to integrate it?

best,
Olivier

coditect · September 8, 2021, 6:35pm

Sorry, Oliver, I never got around to finishing it. I should do something about that!

Irmak · September 10, 2021, 4:29am

Please bring this component back. It is a great help. Thanks!

chris · September 12, 2021, 1:55pm

I opened an issue for it and will try to address it soon:

It’s a pretty straightforward thing to implement.

chris · October 22, 2021, 2:39pm

I think many of you here will be happy to know that I just added a component to the latest development version of the LBT plugin to convert colored meshes into hatches:

You should be able to get the component with the LB Versioner in an hour or so.

Thanks to all of you who 'ed this topic since it allowed me to better prioritize this component. Let me know if you experience any issues with the new component and enjoy!

OlivierDambron · February 2, 2022, 5:12pm

hi @chris

I’m not too sure why, but since I updated the version using the versioner, the bake Mesh to Hatch component does not seem to bake.
Is this a bug?

Best,

chris · February 10, 2022, 8:24pm

Hey @OlivierDambron ,

I am not able to recreate the issue on my end. Everything seems to be working fine:

Do you have an example mesh that might be able to recreate the issue?

OlivierDambron · February 11, 2022, 2:52pm

hi @chris
Thanks for your reply.

I found my mistake, for some reason I had set the hatch type on Rhino to a small pattern instead of Solid, the mesh was in fact well baked onto the desired layer by the component but I couldn’t see it.

Hopefully this post will save some headache for others.
Thanks
Olivier

MarkLabrosse · February 24, 2022, 1:51pm

Hi Chris

I’m working on a workflow where I’d like to bake daylight results to rhino using Elefront. I bake the results into sublayers using this syntax: 5_Results::v"XX"_“CurrentDate”::Visualization

However, it doesn’t seem like the LB Mesh to Hatch component understands the syntax, so it creates a new parent layer instead of baking it into the existing sublayer as illustrated above. Is there a way to make it bake correctly?

/Mark

chris · February 28, 2022, 1:57am

Hey @MarkLabrosse ,

You’re not the first one to ask for this. I just realized that @Mathiassn opened up a GitHub issue about this a few months ago. I just pushed a fix to ladybug-rhino that will ensure that the parent/child layer relationship is interpreted correctly:

You can get the fix on your end with the LB Versioner in an hour or so.

MarkLabrosse · March 1, 2022, 9:44am

Thanks Chris!

Works like a charm now.

/Mark