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saturday06 / VRM-Addon-for-Blender

VRM Importer, Exporter and Utilities for Blender 2.93 to 4.2
https://vrm-addon-for-blender.info
MIT License
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Bug report: Textures are not Exported using Principled BSDF #362

Open Recon419A opened 10 months ago

Recon419A commented 10 months ago

Describe the bug

Following this tutorial as linked in several previous issues from about twelve months ago fails to yield the expected result; instead, it yields an unlit mesh.

Desktop (please complete the following information)

Additional Context

Blender file is attached as untitled.zip, along with the generated VRM and a generated FBX to prove the material is correctly exported to FBX.

Recon419A commented 10 months ago

It's possible I'm just an idiot, as I've never done this before, but as best I can tell I didn't miss anything in the tutorial, which I used to isolate the bug after struggling with more complicated Blender files earlier in the day.

saturday06 commented 10 months ago

Thank you for the report!

In reality, VRM materials are not fully compatible with Principled BSDF, so some information is missing. See the glTF tutorial to learn what information is exported from Principled BSDF to VRM.

VRM is a standard based on glTF, and the VRM add-on uses the glTF add-on when exporting Principled BSDF.

Recon419A commented 10 months ago

That doesn't surprise me, and I fully expect I may have problems with more complicated renders, but I was heavily surprised I couldn't get it working with a basic blue-shaded sphere. It's possible the tutorial is just out of date; do you have an example of a recent, working export I can take a look at to emulate?

I appreciate your quick response, by the way. I'm realizing I jumped in with terrible timing since Blender 4.0.0 released literally hours before I downloaded it.

Recon419A commented 10 months ago

@saturday06 I can confirm this issue is isolated to Blender 4.0.0. Using the previous version of Blender 3.6 and the plugin version intended for it (one release back, 2.20.16) exports materials as intended using the same data files.

saturday06 commented 10 months ago

My operation confirmation was insufficient. This is an addon bug and occurs in Blender 4.0. I have fixed that bug in the latest version of the add-on (2.20.18) that I just released.

Thanks for your report!

write3371 commented 2 months ago

it seems that all texture are gone when exporting as fbx in 4.x, do you know what's the reason? @saturday06

saturday06 commented 2 months ago

Old add-on do not support fbx texture export. Could you tell me the add-on version you are using?

saturday06 commented 2 months ago

The latest version 2.20.60 supports it.