Qt Quick 3D - Sub-mesh Example

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 import QtQuick
 import QtQuick3D

 Model {
     source: "qrc:/meshes/distortedcube.mesh"

     PrincipledMaterial {
         id: frontTop_material
         baseColor: "red"
         cullMode: Material.NoCulling
         lighting: PrincipledMaterial.NoLighting
     }

     PrincipledMaterial {
         id: frontBottom_material
         baseColor: "green"
         cullMode: Material.NoCulling
         lighting: PrincipledMaterial.NoLighting
     }

     PrincipledMaterial {
         id: leftSide_material
         baseColor: "blue"
         cullMode: Material.NoCulling
         lighting: PrincipledMaterial.NoLighting
     }

     PrincipledMaterial {
         id: rightSide_material
         baseColor: "pink"
         cullMode: Material.NoCulling
         lighting: PrincipledMaterial.NoLighting
     }

     PrincipledMaterial {
         id: backSide_material
         baseColor: "orange"
         cullMode: Material.NoCulling
         lighting: PrincipledMaterial.NoLighting
     }

     PrincipledMaterial {
         id: bottomSide_material
         baseColor: "navy"
         cullMode: Material.NoCulling
         lighting: PrincipledMaterial.NoLighting
     }

     materials: [
         frontTop_material,
         frontBottom_material,
         leftSide_material,
         backSide_material,
         rightSide_material,
         bottomSide_material
     ]
 }