alphaTest/Coverage changes in latest vs 1.64.6?

Help & Support
1

Hello everyone, I’m currently investigating the modifications made to alphaTest and alphaToCoverage. In version 1.64.4, when dealing with a semi-transparent texture, fully transparent parts remain hidden, and semi-transparent portions appear as intended (opaque/half transparent color). However, in the latest engine version, transparent regions are obscured, and semi-transparent areas are displayed as fully filled color.

Any suggestions on how to patch the latest engine to replicate the functionality of version 1.64.4? Thanks for any insights!

2

This is possibly related to Issues with transparency in glb models · Issue #5902 · playcanvas/engine · GitHub
@slimbuck

3

I assume this is the part I need to patch in order to have 1.64.4 functionality?

Screenshot_2024-01-25-23-48-42-824-edit_com.android.chrome
Screenshot_2024-01-25-23-48-42-824-edit_com.android.chrome1080×481 94.6 KB

4

yep, I assume that is causing the difference for you.

5

We’ve just reverted this change, it should be released in about a week or so.

6

I’d like to add some of my observations from the current editor build.

  1. If you load a model + texture from within editor env, semi-transparent can’t be visible
  2. If you load a model, and texture is loaded and applied dynamically to the model, semi-transparent is visible (the goal)
        const skinTexture = assets[1].resource; 

        skinTexture.minFilter = pc.FILTER_NEAREST;
        skinTexture.magFilter = pc.FILTER_NEAREST;
        skinTexture.addressU = pc.ADDRESS_CLAMP;
        skinTexture.addressV = pc.ADDRESS_CLAMP;

        const mat = new pc.StandardMaterial();
        mat.diffuseMap = pc.app.assets.find('skin1').resource;
        mat.opacityMap = pc.app.assets.find('skin1').resource;
        mat.opacityMapUv = 0;
        mat.opacityMapChannel = "a";
        mat.aplhaTest = 1;
        mat.alphaToCoverage = true;
        mat.emmisive = new pc.Color().fromString('#000000');
        mat.specular = new pc.Color().fromString('#000000');
        mat.cull = pc.CULLFACE_NONE;