Reading object display color in Grasshopper

Grasshopper
,
1

How do I go about learning the object color set in rhino from grasshopper?

I have a bunch of surfaces in a 3d model that have been coded in various colors and I’d like to use this information in my grasshopper script, but how do I go about this?

A supplementary question is how to use the new Rhino filter components to select the surfaces based on these colors…

I feel both thinks must be super easy, but I just can’t figure it out…so any suggestion would be welcome

thanks

2

I assume you’re using Rhino 8?

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object_display_color.gh (16.5 KB)

test_export.3dm (130.4 KB)

3

This looks super promising and I now have a list of the colors and I can choose one index/color that I want to select for, but how do I then turn around and use the selected color to select all the cubes that have the same color?

THANKS
anders

4

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You can group by attributes using the Group Content component.

I’m pretty sure you need a script to select objects which have not been baked with a grasshopper definition…

What exactly is the goal?

5

I have a facade with >3000 panels in a number of categories that have been color coded to indicate material, color and tilt etc

Ideally just select all the surfaces/objects and automatically group and list by color so I can count units and area, but also manipulate them by group (ie add details or tilt etc)

Alternatively, a base functionality could be to choose one of the surfaces and ask to select all the ones with the same color…a version of the build-in rhino function to select by property

Does it make sense?

6

Ideally you would have a spreadsheet, *.csv or some other file containing the logic. If you just have the ‘stupid’ geometry, you can either group the way I already posted above or in a very similar way filter…

Then there is rhinoscriptsyntax and you can select geometry like so:

import rhinoscriptsyntax as rs
import scriptcontext as sc
import Rhino

sc.doc = Rhino.RhinoDoc.ActiveDoc

if bool==1: 
    rs.ObjectsByName(name,True)

sc.doc = ghdoc

This will select everything with the name you plug into the Grasshopper python component.

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And here’s a link to the help pages:

Rhino - RhinoScriptSyntax