# Material binding strength issue on instances

**URL:** <https://forum.aousd.org/t/material-binding-strength-issue-on-instances/836>\
**Category:** USD\
**Created:** [October 20, 2023, 7:19pm UTC](https://forum.aousd.org/t/material-binding-strength-issue-on-instances/836 "2023-10-20T19:19:18Z")\
**Posts on this page:** 4\
**Page:** 1

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**Author:** ![asluk](https://sea2.discourse-cdn.com/flex016/user_avatar/forum.aousd.org/asluk/32/771_2.png) [@asluk](https://forum.aousd.org/u/asluk)\
**Post date:** [October 20, 2023, 7:19pm UTC](https://forum.aousd.org/t/material-binding-strength-issue-on-instances/836/1 "2023-10-20T19:19:18Z")

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[simple\_instanced\_material.usda](https://forum.aousd.org/uploads/short-url/yxIWWX07yqLhXSY6XACmIjESyQE.usda) (40.4 KB)

In the attached usda (thanks to Pal Mezei for distilling down the repro!), the material binding on the scenegraph instance /World/Geometry/Basic/Hormig is not honored, even though it is “Stronger than Descendants”, unless the material binding on the “prototype” /World/Prototypes/Hormig/Mesh\_1 is cleared.

Is that expected, and if so, should it be added to [Universal Scene Description: UsdShadeMaterialBindingAPI Class Reference](https://openusd.org/release/api/class_usd_shade_material_binding_a_p_i.html#UsdShadeMaterialBindingAPI_MaterialResolution) ? Thanks for looking!

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**Author:** ![chris.rydalch](https://sea2.discourse-cdn.com/flex016/user_avatar/forum.aousd.org/chris.rydalch/32/139_2.png) [@chris.rydalch](https://forum.aousd.org/u/chris.rydalch)\
**Post date:** [October 26, 2023, 1:34am UTC](https://forum.aousd.org/t/material-binding-strength-issue-on-instances/836/2 "2023-10-26T01:34:32Z")

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Hey Aaron! This sounds like the same issue reported here: [https://github.com/PixarAnimationStudios/OpenUSD/issues/1571](https://github.com/PixarAnimationStudios/OpenUSD/issues/1571)

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**Author:** ![asluk](https://sea2.discourse-cdn.com/flex016/user_avatar/forum.aousd.org/asluk/32/771_2.png) [@asluk](https://forum.aousd.org/u/asluk)\
**Post date:** [October 26, 2023, 3:54am UTC](https://forum.aousd.org/t/material-binding-strength-issue-on-instances/836/3 "2023-10-26T03:54:28Z")

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Nice one, thanks Chris!

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**Author:** ![spiff](https://sea2.discourse-cdn.com/flex016/user_avatar/forum.aousd.org/spiff/32/22_2.png) [@spiff](https://forum.aousd.org/u/spiff)\
**Post date:** [November 3, 2023, 11:28pm UTC](https://forum.aousd.org/t/material-binding-strength-issue-on-instances/836/4 "2023-11-03T23:28:59Z")

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Just updated Chris’s Issue to reflect our belief this has been fixed in H2O already.