Please add remark about differing size units between glTF/glb and USDZ

The README recommends to use meter as unit size. Note about units and model size in AR. Please add a note that USDZ exports should be in centimeter instead and may need scaling, or iOS users will see models 100 times smaller.

[pushmatrix]

FYI metersPerUnit is now working in iOS13. It also supports channel packing, so it will use the same ORM texture from the glb in the usdz.

The problem is that this will only work on iOS13. It will be ignored on iOS12 resulting in the model being way too big.

How we got around it at Shopify is to only show the AR badge on iOS13 and above.

[PixelPartner]

Please make sure, the usd file has a metersPerUnit setting for its UsdStage or Quicklook will default to centimeters and assets will look 100 times smaller than the gltf version.

Am 21.05.2019 um 06:59 schrieb Christopher Joel [e-mail]:

@PixelPartner ultimately we are not in control of what a user decides to set as their metersPerUnit. I will propose that we change our documentation to remind users that while we recommend metersPerUnit should be set to 1, ultimately they must decide for themselves what the value should be.

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