# Interchange GLTF importer truncates skeletal mesh bone influences to 4 per vertex

**URL:** <https://forums.unrealengine.com/t/interchange-gltf-importer-truncates-skeletal-mesh-bone-influences-to-4-per-vertex/2745391>\
**Category:** Issues and Bug Reporting (Unreal Engine)\
**Tags:** unreal-engine, open, bug-report\
**Created:** [August 20, 2026, 5:57pm UTC](https://forums.unrealengine.com/t/interchange-gltf-importer-truncates-skeletal-mesh-bone-influences-to-4-per-vertex/2745391 "2026-08-20T17:57:58Z")\
**Posts on this page:** 1\
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**Author:** ![UE\_FlavienP](https://d1ap1mz92jnks1.cloudfront.net/user_avatar/forums.unrealengine.com/ue_flavienp/32/1194546_2.png) [@UE\_FlavienP](https://forums.unrealengine.com/u/UE_FlavienP)\
**Post date:** [August 21, 2026, 10:40am UTC](https://forums.unrealengine.com/t/interchange-gltf-importer-truncates-skeletal-mesh-bone-influences-to-4-per-vertex/2745391/2 "2026-08-21T10:40:09Z")

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It is the glTF specification that limits mesh bone influences to 4 per vertex. UE is aligned on the format spec.

Where do you get your glTF from? Are you exporting it from a specific DCC?

[https://registry.khronos.org/glTF/specs/2.0/glTF-2.0.html#skinned-mesh-attributes](https://registry.khronos.org/glTF/specs/2.0/glTF-2.0.html#skinned-mesh-attributes)

 ![image](https://d3kjluh73b9h9o.cloudfront.net/original/4X/6/f/2/6f2593199443e87a33f5a8b556be13d2cf40fed6.png)

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