How to dynamically add materials to rhino doc from rmtl file?

Rhino Developer
,
1

Is there an api to do this?

2

Hi @duzhengjie1,

yes, look into Rhino.Render.RenderContent to see what is possible. To load a material from disk below seems to work in Rhino 7:

import Rhino
import scriptcontext

file = r"D:\Temp\TestMaterial.rmtl"
m = Rhino.Render.RenderContent.LoadFromFile(file)
if m:
    # add to document
    Rhino.Render.RenderContent.AddPersistentRenderContent(scriptcontext.doc, m)

Note: if a material exists with the same name, you’ll might want to precheck and decide what to do…
_
c.

1 Like
3

@clement Thanks very much!

4

FYI if you want to create materials fully dynamic you can read through some of my samples that I wrote last year:

https://jesterking.github.io/rhipy/

5

@nathanletwory Ok，thanks

6

@nathanletwory May I have a question again please?What’t the difference between materials and rendermaterials ?And can the two object transform each other?

7

No difference, RenderMaterial is just the underlying class name of the code for materials.

What exactly are you looking for?

8

ObjectAttributes need a MaterialIndex,it gets from Materials,I have added rendermaterial,but I get nothing when find it from materials

9

Ah, you should no longer use the Material class, and the Materials table, but instead use the RenderMaterials table of a document.

Setting a RenderMaterial to an object is easy by setting it to the object RenderMaterial property.

See https://jesterking.github.io/rhipy/create_specific_rendermaterial.html for a simple example.

I am in the process of writing a simple script to show you how to load RMTL files into a Rhino document.

10

But I need to add some geometries to the InstanceDefinitions,I want its geometries can render from the materials also.The InstanceDefitions only supply the api from geometries and the ObjectAttributes.What can i do for this?

11

Set the RenderMaterial render content to the ObjectAttributes.RenderMaterial Property for the geometry you want to add or modify in the instance definition.

Here a script to load all RMTL files from a folder, recursively.

import Rhino as r
import Eto.Forms as ef
import System.IO as sio
import os
import os.path
import clr
import scriptcontext as sc

clr.AddReference('System.Xml')
import System.Xml as sysxml

file_dialog = ef.SelectFolderDialog()
rc = file_dialog.ShowDialog(r.UI.RhinoEtoApp.MainWindow)

if rc == ef.DialogResult.Ok:
    for root, dirs, files in os.walk(file_dialog.Directory):
        for fname in files:
            if fname.endswith(".rmtl"):
                xmldoc = sysxml.XmlDocument()
                xmldoc.LoadXml(sio.File.ReadAllText(os.path.join(root, fname)))
                content = xmldoc.SelectSingleNode('xml')
                render_content = r.Render.RenderContent.FromXml(content.InnerXml, sc.doc)
                r.Render.RenderContent.AddPersistentRenderContent(sc.doc, render_content)

Addendum: the last line in the script shouldn’t be necessary. I have logged RH-67920 RenderContent.FromXml(str, RhinoDoc) incorrect behavior to track that.

12

Ok,thanks very much!

13

What is the process for c#?

            XmlDocument xmldoc = new XmlDocument();
            xmldoc.LoadXml(File.ReadAllText(rmtlFilePath));
            XmlNode content = xmldoc.SelectSingleNode("xml");
            RenderContent renderContent = RenderContent.FromXml(content.InnerXml, doc);
            RenderContent.AddPersistentRenderContent(doc, renderContent);

That last line is deprecated, but not sure how to get a RenderMaterial from RenderContent? For:

doc.RenderMaterials.Add(RenderMaterial material)
14 
if(renderContent is RenderMaterial rm) {
    doc.RenderMaterials.Add(rm);
}
1 Like
15

Yeah I should have waited a few seconds, I didn’t realize RenderContent was the base class. Thank you for the fast response.