Embedded texture buffer empty

[tellypresence]

On branch rendermesh-refactor or dev

When loading model CesiumMan.usdz

render_scene.images[0].asset_identifier is correctly populated as 0/CesiumMan_img0.jpg, but width, height set to-1.

render_scene.images[0].buffer_id field is 0, but corresponding buffer for that (apparently correct) id of 0 has render_scene.buffers[0].size() of 0, i.e. image data buffer empty

[syoyo]

Currently TinyUSDZ Tydra only supports loading texture from file, and does not load asset from memory(USDZ ZIP container).

https://github.com/syoyo/tinyusdz/blob/caa6d877ff5448a3b1ca48497e0a07f374b5098c/src/tydra/render-data.cc#L2599

Reading texture asset from USDZ container is todo:

• Setup AssetResolution to read an asset from USDZ container
• Use tinyusdz::image::LoadImageFromMemory to load texture

[syoyo]

tydra_to_renderscene example in recent rendermesh-refactor branch now able to read asset in USDZ.

$ tydra_to_renderscene models/texture-cat-plane.usdz

...

images {
[0] TextureImage {
        asset_identifier "./textures/texture-cat.jpg"
        channels 4
        width 768
        height 768
        miplevel 0
        colorSpace srgb
        bufferID 0

    }
}

buffers {
[0] Buffer {
        bytes 9437184
        componentType float
    }
}

[tellypresence]

In recent rendermesh-refactor branch, embedded textures working well