I am building AliceVision Meshroom on windows, which uses QML components.

My build steps are here: https://gist.github.com/julianrendell/da6372201234d943d3e4f77e43674fd2

When I execute:

set QML2_IMPORT_PATH="D:\Meshroom_Dev\qmlAlembic\qml;D:\Meshroom_Dev\QtOIIO\qml;D:\Meshroom_Dev\QtAliceVision\qml" 

And run the application, none of the QML plugins are discovered.

The output of tree /F /A for each of the directories containing the qml directories is:

D:\MESHROOM_DEV\QMLALEMBIC
---qml
    ---AlembicEntity
            alembicEntityQmlPlugin.dll
            alembicEntityQmlPlugin.lib
            qmldir

D:\MESHROOM_DEV\QTOIIO
+---imageformats
|       QtOIIOPlugin.dll
|       QtOIIOPlugin.lib
|
---qml
    ---DepthMapEntity
            depthMapEntityQmlPlugin.dll
            depthMapEntityQmlPlugin.lib
            qmldir

D:\MESHROOM_DEV\QTALICEVISION
---cml
    ---AliceVision
            qmldir
            qtAliceVisionPlugin.dll
            qtAliceVisionPlugin.lib

But when I copy all the QML components into a single directory, and use the following:

{{set QT_PLUGIN_PATH=D:\Meshroom_Dev\qtPlugins}}

{{set QML2_IMPORT_PATH=%QT_PLUGIN_PATH%\qml}}

It works. The content of these directories are:

{{D:\MESHROOM_DEV\QTPLUGINS}}
{{{{   +---image-formats}}}}
{{{{   |       QtOIIOPlugin.dll}}}}
{{{{   |       QtOIIOPlugin.lib}}}}
{{{{   |}}}}
{{{{   ---qml}}}}
{{{{     +---AlembicEntity}}}}
{{{{         |       alembicEntityQmlPlugin.dll}}}}
{{{{         |       alembicEntityQmlPlugin.lib}}}}
{{{{         |       qmldir}}}}
{{{{         |}}}}
{{{{         +---AliceVision}}}}
{{{{         |       qmldir}}}}
{{{{         |       qtAliceVisionPlugin.dll}}}}
{{{{         |       qtAliceVisionPlugin.lib}}}}
{{{{         |}}}}
{{{{         ---DepthMapEntity}}}}
{{{{                 depthMapEntityQmlPlugin.dll}}}}
{{                  depthMapEntityQmlPlugin.lib}}
{{                  qmldir }} 

(line inserted to try and work around formatting issues)