PLY exporter: export selection or scene

D6060 now PLY exporter behaves similar to the rest of the export add-ons.

io_mesh_ply/__init__.py

@@ -104,6 +104,11 @@ class ExportPLY(bpy.types.Operator, ExportHelper):
     filename_ext = ".ply"
     filter_glob: StringProperty(default="*.ply", options={'HIDDEN'})
 
+    use_selection: BoolProperty(
+        name="Selection Only",
+        description="Export selected objects only",
+        default=False,
+    )
     use_mesh_modifiers: BoolProperty(
         name="Apply Modifiers",
         description="Apply Modifiers to the exported mesh",
@@ -136,10 +141,6 @@ class ExportPLY(bpy.types.Operator, ExportHelper):
         default=1.0,
     )
 
-    @classmethod
-    def poll(cls, context):
-        return context.active_object is not None
-
     def execute(self, context):
         from . import export_ply
 
@@ -169,6 +170,30 @@ class ExportPLY(bpy.types.Operator, ExportHelper):
         pass
 
 
+class PLY_PT_export_include(bpy.types.Panel):
+    bl_space_type = 'FILE_BROWSER'
+    bl_region_type = 'TOOL_PROPS'
+    bl_label = "Include"
+    bl_parent_id = "FILE_PT_operator"
+
+    @classmethod
+    def poll(cls, context):
+        sfile = context.space_data
+        operator = sfile.active_operator
+
+        return operator.bl_idname == "EXPORT_MESH_OT_ply"
+
+    def draw(self, context):
+        layout = self.layout
+        layout.use_property_split = True
+        layout.use_property_decorate = False  # No animation.
+
+        sfile = context.space_data
+        operator = sfile.active_operator
+
+        layout.prop(operator, "use_selection")
+
+
 class PLY_PT_export_transform(bpy.types.Panel):
     bl_space_type = 'FILE_BROWSER'
     bl_region_type = 'TOOL_PROPS'
@@ -233,6 +258,7 @@ def menu_func_export(self, context):
 classes = (
     ImportPLY,
     ExportPLY,
+    PLY_PT_export_include,
     PLY_PT_export_transform,
     PLY_PT_export_geometry,
 )
@@ -253,5 +279,6 @@ def unregister():
     bpy.types.TOPBAR_MT_file_import.remove(menu_func_import)
     bpy.types.TOPBAR_MT_file_export.remove(menu_func_export)
 
+
 if __name__ == "__main__":
     register()

io_mesh_ply/export_ply.py

@@ -189,43 +189,59 @@ def save(
         operator,
         context,
         filepath="",
+        use_selection=False,
         use_mesh_modifiers=True,
         use_normals=True,
         use_uv_coords=True,
         use_colors=True,
         global_matrix=None
 ):
-    obj = context.active_object
-
-    if global_matrix is None:
-        from mathutils import Matrix
-        global_matrix = Matrix()
+    import bmesh
 
     if bpy.ops.object.mode_set.poll():
         bpy.ops.object.mode_set(mode='OBJECT')
 
-    mesh_owner_object = None
-    if use_mesh_modifiers and obj.modifiers:
-        depsgraph = context.evaluated_depsgraph_get()
-        mesh_owner_object = obj.evaluated_get(depsgraph)
-        mesh = mesh_owner_object.to_mesh()
+    if use_selection:
+        obs = context.selected_objects
     else:
-        mesh_owner_object = obj
-        mesh = mesh_owner_object.to_mesh()
+        obs = context.scene.objects
 
-    if not mesh:
-        raise Exception("Error, could not get mesh data from active object")
+    depsgraph = context.evaluated_depsgraph_get()
+    bm = bmesh.new()
+
+    for ob in obs:
+        if use_mesh_modifiers:
+            ob_eval = ob.evaluated_get(depsgraph)
+        else:
+            ob_eval = ob
+
+        try:
+            me = ob_eval.to_mesh()
+        except RuntimeError:
+            continue
+
+        me.transform(ob.matrix_world)
+        bm.from_mesh(me)
+        ob_eval.to_mesh_clear()
+
+    mesh = bpy.data.meshes.new("TMP PLY EXPORT")
+    bm.to_mesh(mesh)
+    bm.free()
+
+    if global_matrix is not None:
+        mesh.transform(global_matrix)
 
-    mesh.transform(global_matrix @ obj.matrix_world)
     if use_normals:
         mesh.calc_normals()
 
-    ret = save_mesh(filepath, mesh,
-                    use_normals=use_normals,
-                    use_uv_coords=use_uv_coords,
-                    use_colors=use_colors,
-                    )
+    ret = save_mesh(
+        filepath,
+        mesh,
+        use_normals=use_normals,
+        use_uv_coords=use_uv_coords,
+        use_colors=use_colors,
+    )
 
-    mesh_owner_object.to_mesh_clear()
+    bpy.data.meshes.remove(mesh)
 
     return ret