start.bat: Replace PATH edits with ALICEVISION_LIBPATH

Additionally, add an example of the standard path for the Python
binding of AliceVision to the `PYTHONPATH` example.

Author: cbentejac

meshroom/__init__.py

@@ -150,10 +150,12 @@ def addToEnvPath(var, val, index=-1):
             if key not in os.environ and os.path.exists(value):
                 logging.debug(f"Set {key}: {value}")
                 os.environ[key] = value
-    else:
-        addToEnvPath("PATH", os.environ.get("ALICEVISION_BIN_PATH", ""))
 
-    addToEnvPath("PATH", os.environ.get("ALICEVISION_LIBPATH", ""))
+    addToEnvPath("PATH", os.environ.get("ALICEVISION_BIN_PATH", ""))
+    if sys.platform == "win32":
+        addToEnvPath("PATH", os.environ.get("ALICEVISION_LIBPATH", ""))
+    else:
+        addToEnvPath("LD_LIBRARY_PATH", os.environ.get("ALICEVISION_LIBPATH", ""))
 
 
 os.environ["QML_XHR_ALLOW_FILE_READ"] = '1'

start.bat

@@ -9,8 +9,9 @@ REM set MESHROOM_OUTPUT_QML_WARNINGS=1
 REM set MESHROOM_INSTANT_CODING=1
 REM set QT_PLUGIN_PATH=C:\dev\meshroom\install
 REM set QML2_IMPORT_PATH=C:\dev\meshroom\install\qml
-REM set PATH=C:\dev\AliceVision\install\bin;C:\dev\vcpkg\installed\x64-windows\bin;%PATH%
 REM set ALICEVISION_ROOT=C:\dev\AliceVision\install
+REM set ALICEVISION_LIBPATH=%ALICEVISION_ROOT%\bin;C:\dev\vcpkg\installed\x64-windows\bin
 
-python meshroom\ui
+REM PYTHONPATH=%ALICEVISION_ROOT%\lib\python;%PYTHONPATH%
 
+python meshroom\ui