TextMeshPro - Material Preset option not persisting in prefab once material font atlas has changed

Unity Engine
,
1

I’m using the Bitmap Custom Atlas shader and changing the Font Atlas under debug settings of the material.

If I create a font asset and a few material presets, I can get any chosen material preset to persist within a prefab.

However, the moment I change any of these materials Font Atlas’ - the option won’t persist.

I’ve been trying to debug the issue to see what it might hit in TMP for this but I’m a bit lost.

edit: Quick repro -

  • Default LiberationSans SDF font asset - change the Font Atlas to any other texture for now.
  • Create a prefab of a TMP object
  • Create material preset for font asset
  • Set prefabs material preset to new preset, save
  • Close prefab
  • Open prefab - preset didn’t persist

I know editing the font atlas might be a bit of an odd use case, I don’t mind doing some custom implementation within TMP to work around it.

2

Prefab seems to serialize property change correctly. If I click the prefab once in editor, I can see the correct material preset.

The moment I open the prefab in the prefab editor, the material preset is lost.

edit:
nvm - found it :smile:

TMPro_Private

                // If font atlas texture doesn't match the assigned material font atlas, switch back to default material specified in the Font Asset.
                if (m_sharedMaterial == null || m_sharedMaterial.GetTexture(ShaderUtilities.ID_MainTex) == null ||
                    m_fontAsset.atlasTexture.GetInstanceID() !=
                    m_sharedMaterial.GetTexture(ShaderUtilities.ID_MainTex).GetInstanceID())
                {
                    if (m_fontAsset.material == null)
                        Debug.LogWarning(
                            "The Font Atlas Texture of the Font Asset " + m_fontAsset.name + " assigned to " +
                            gameObject.name + " is missing.", this);
                    else
                        m_sharedMaterial = m_fontAsset.material;
                }
1 Like
3

Hello @pikminscience

Did you ever figure out what is going on with this issue? I think I am running into the same thing.

I wonder if a fix was ever found and released? I am using LTS 2022.3.9f1

Thank you

1 Like
4

Hey, sorry - super late; might still be handy for someone.

I branched the package and commented out some statements:

TMPro_Private:

                if (m_sharedMaterial == null || m_sharedMaterial.GetTexture(ShaderUtilities.ID_MainTex) == null) 
                    // ||
                    // m_fontAsset.atlasTexture.GetInstanceID() !=
                    // m_sharedMaterial.GetTexture(ShaderUtilities.ID_MainTex).GetInstanceID())
                {
                    if (m_fontAsset.material == null)
                        Debug.LogWarning(
                            "The Font Atlas Texture of the Font Asset " + m_fontAsset.name + " assigned to " +
                            gameObject.name + " is missing.", this);
                    else
                        m_sharedMaterial = m_fontAsset.material;
                }