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Shader value always null

See original GitHub issue

When trying to export any model the exporter always gives an exception that Shader value cannot be null when creating a new material.

error

The error lies in GLTFSceneExporter.cs line 90

line 90: var metalGlossChannelSwapShader = Resources.Load("MetalGlossChannelSwap", typeof(Shader)) as Shader;
line 91: _metalGlossChannelSwapMaterial = new Material(metalGlossChannelSwapShader);

line 92: var normalChannelShader = Resources.Load("NormalChannel", typeof(Shader)) as Shader;
line 93: _normalChannelMaterial = new Material(normalChannelShader);

This is on the latest release. Any idea on how I can make it work?

Issue Analytics

State:
Created 4 years ago
Comments:9 (1 by maintainers)

Top GitHub Comments

8reactions

andreaspleschcommented, Apr 25, 2019

For me the root problem was that I used https://github.com/KhronosGroup/UnityGLTF/releases/download/v1.0.1/UnityGLTF.unitypackage to add GLTF capability to a new, existing project. It turns out that this is not enough. The gltf export also needs a copy of the Resources folder from the repo or source.zip (https://github.com/KhronosGroup/UnityGLTF/archive/v1.0.1.zip) to be available in the project’s Assets folder. Without it line 90 in GLTFSceneExporter.cs does not find the “MetalGlossChannelSwap” shader resource and Resources.Load returns null (should there be guard ?). So just copying that Resources folder into the project’s Assets folder should fix this issue.

Ultimately, that is a packaging issue since neither UnityGLTF.unitypackage nor the upm package at https://github.com/KhronosGroup/UnityGLTF/releases/download/v1.0.1/org.khronos.UnityGLTF.zip currently contain the Resources folder although they probably should. In other words, it might work to move the Resources folder into the Assets/UnityGLTF folder, in the repo ?

3reactions

andreaspleschcommented, Apr 25, 2019

I moved the Resources folder into Assets/UnityGLTF folder in this branch: https://github.com/andreasplesch/UnityGLTF/tree/linux-build The built unity package: UnityGLTF.unitypackage.zip works now also for exporting gltf after being imported into a project.

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