Set Materials using the rhino3dm library

Rhino Developer rhino3dm
1

@fraguada

How can you set the Render material to a BREP using the rhino3dm library?

import rhino3dm

file_path = r'C:\Users\dande\Documents\GitHub\project-template\Rhino Template\CPI.TEMPLATE.R4.3dm'
model = rhino3dm.File3dm.Read(file_path)

#is this the best way to get a layer index for a given layer name?
for layer in model.Layers:
    #print(layer.Name)
    if layer.Name == "LOD 300":
        lod_300_index = layer.Index

#how to find the material index for a given render material name?
for material in model.Materials:
    print(material.Name)
    print(material.RenderMaterialInstanceId)
    if material.Name == "STEEL_PRIMED":
        print("Steel found")        
        #steel_index = material.Index  ---- this doesn't work, so how do I get the material index given a RENDER material name?
    else:
        steel_index = 2  #a dummy index 

box1 = rhino3dm.BoundingBox(rhino3dm.Point3d( 0,0,0 ), rhino3dm.Point3d( 4,5,0.75))
geometry = (box1.ToBrep())
attr = rhino3dm.ObjectAttributes()
attr.Name = "Box"
attr.LayerIndex = lod_300_index
attr.MaterialIndex = 2  #this a dummy index, but it doesn't seem to work, does the object material source need to be changed?

model.Objects.AddBrep(geometry,attr)

write = model.Write('plate_tests.3dm',7)
2

@nathanletwory is this something you might be able to help me with?

3

This part is still a bit underdefined. The developer who added RenderContent (RenderMaterial, RenderTexture, RenderEnvironment) support to rhino3dm is looking into this.

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4

Logged issue: RH3DM-185 Make it possible to assign RenderMaterial to File3dmObject

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