AlphaBlendModeTest.gltf json has strange "samplers" field in root object.

[psilord]

Hello,

I find the file glTF-Sample-Models/2.0/AlphaBlendModeTest/glTF-Embedded/AlphaBlendModeTest.gltf has this in it:

    "samplers" : [
        {}
    ],

which I don't think is right. Or at least I don't see that in the spec this is legal.

Thank you.

[emackey]

Hi @psilord, this odd snippet of code does pass validation against the sampler schema. Basically it declares an array of samplers, populated by only a single sampler, which is referenced elsewhere in the file via "sampler" : 0.

The values to use in this sampler are all defaults. For wrapS and wrapT, the schema provides an explicit default of 10497 which is the enum value for REPEAT, so texture coordinates outside the zero-to-one range should repeat the texture image.

For magFilter and minFilter, the specification has this to say:

Default Filtering Implementation Note: When filtering options are defined, runtime must use them. Otherwise, it is free to adapt filtering to performance or quality goals.

So for this sampler, implementations are free to choose their preferred texture filtering.

[psilord]

Ah I see. This all makes sense now. Thank you!