fix: make sure export_glb is handling a single Polydata object (#2032)

Co-authored-by: pyansys-ci-bot <[email protected]>

Author: RobPasMue

doc/changelog.d/2032.fixed.md

@@ -0,0 +1 @@
+Make sure export_glb is handling a single polydata object

src/ansys/geometry/core/plotting/plotter.py

@@ -557,8 +557,26 @@ def export_glb(
         ~pathlib.Path
             Path to the exported glb file.
         """
+        # Export to GLB requires merging the object into a single mesh
+        LOG.debug(
+            "Exporting to GLB requires merging the object into a single mesh. "
+            "This may take some time depending on the size of the object."
+        )
+        LOG.debug(
+            "When calling export_glb, if you had previously set the plotting_options "
+            "'merge_bodies' or 'merge_component' to False, they will be ignored."
+        )
+        plotting_options["merge_component"] = True
+        plotting_options["merge_bodies"] = True
+
         if plotting_object is not None:
             self.plot(plotting_object, **plotting_options)
+        else:
+            LOG.warning(
+                "If you had previously added the objects to the plotter, "
+                "make sure that the options 'merge_bodies' and 'merge_component' "
+                "are set to True, otherwise the export will not work as expected."
+            )
 
         # Depending on whether a name is provided, the file will be saved with the name
         # provided or with a default name (temp_glb). If a name is provided, the file will