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  1. Qt
  2. QTBUG-92827

meshName property doesn't affect rendering

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    Details

    • Type: Bug
    • Status: Reported
    • Priority: P3: Somewhat important
    • Resolution: Unresolved
    • Affects Version/s: 5.12.3
    • Fix Version/s: None
    • Component/s: Qt3D
    • Labels:
      None
    • Environment:
      macOS 11.2.1
      Qt 5.12.3
    • Platform/s:
      macOS

      Description

      It looks like the meshName property is ignored when loading a Wavefront file with Mesh and it ends up loading all the vertices/faces of the model:

      Mesh {
          id: carMesh
          meshName: "13914_Taxi_car"
          source: "qrc:/Taxi/13914_Taxi_v2_L1.obj"
          onStatusChanged: { console.log("Taxi: status=" + status); }
      }

      Upon inspecting the 13914_Taxi_v2_L1.obj , I can see it defines named groups using the g tag, as in:

      ...
      
      g 13914_Taxi_car
      usemtl 13914_Taxi_car
      s 2
      f 37559/39651/36283 37560/39652/36284 37561/39653/36285 37562/39654/36286  
      ...

      So I would expect Mesh to be able to load just this part of the model. Am I right to assume this?

      Unfortunately, using a meshName that doesn't exist in the wavefront file also doesn't generate errors/warnings/problems and the entire mesh gets loaded instead.

      I attached a small, reproducible and compilable example to this ticket that also contains the 3D model to facilitate testing.

      Am I using it wrong? The documentation is almost non-existent on this topic.

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            Assignee:
            seanharmer Sean Harmer
            Reporter:
            karlbuhr Karl Buhr
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              Dates

              Created:
              Updated:

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