glTF-Blender-IO: Diffuse BSDF and use_nodes=False are not supported.

Describe the bug

Materials colors are not exported

Taking this file

Cow.blend.zip

Exporting with the old exporter I get this

With the current export (cloned from the repo) I get this

To Reproduce Steps to reproduce the behavior:

Download the attached file, unzip, double click the .blend file
File->Export->glTF 2.0
Export
Load in a viewer

Expected behavior

There are material colors

Checking the gltf data the old exporter has this

    "materials" : [
        {
            "name" : "Black",
            "pbrMetallicRoughness" : {
                "baseColorFactor" : [
                    0.02327823673603291,
                    0.02327823673603291,
                    0.02327823673603291,
                    1.0
                ],
                "metallicFactor" : 0.0
            }
        },
        {
            "name" : "Pink",
            "pbrMetallicRoughness" : {
                "baseColorFactor" : [
                    0.640000066757203,
                    0.1408390542989828,
                    0.1733517791830268,
                    1.0
                ],
                "metallicFactor" : 0.0
            }
        },
        {
            "name" : "White",
            "pbrMetallicRoughness" : {
                "baseColorFactor" : [
                    0.6400000190734865,
                    0.6400000190734865,
                    0.6400000190734865,
                    1.0
                ],
                "metallicFactor" : 0.0
            }
        }
    ],

the new exporter only this

    "materials" : [
        {
            "name" : "White",
            "pbrMetallicRoughness" : {}
        },
        {
            "name" : "Black",
            "pbrMetallicRoughness" : {}
        },
        {
            "name" : "Pink",
            "pbrMetallicRoughness" : {}
        }
    ],

yes, export materials was checked

Version

OS: macOS
Blender Version 2.79

About this issue

Original URL
State: closed
Created 5 years ago
Comments: 15 (6 by maintainers)

Most upvoted comments

@samanthajo2 @kocsis1david In blender, use_node is most of the time enable by default. You provided only .blend file, so I don’t know what file format you imported, and I can’t check what happpen at import level.

The aim of an exporter is not to export exactly what was imported, but to export what is inside Blender. If use_node is not checked, and render in blender, you will not see the same render than if use_node is checked. Exporter should take this into account to export was use can see when he renders. ( of course modulo specification of the file format, that can’t handle everything done in blender)

julienduroure on Aug 16, 2019

The title talks about Diffuse BSDFs, but the Cow.blend file only uses use_nodes=False. I filed #1148 to fix use_nodes=False.

If Diffuse BSDF needs to be exported, I think a separate issue should be filed with an example .blend.

scurest on Jul 27, 2020

Let’s keep this open to track that Diffuse BSDF and use_nodes=False are not supported.

This exporter was rewritten — involving a very, very large number of changes — for Blender 2.80, and support for Blender 2.80-standard settings is currently higher priority. But supporting Diffuse BSDF and use_nodes=False again would be nice, if it’s not a major change from the current material export.

donmccurdy on Sep 4, 2019

For more detail on what we support, and recommended settings, see https://docs.blender.org/manual/en/2.80/addons/io_scene_gltf2.html.

donmccurdy on Aug 16, 2019