diff --git a/invesalius/data/surface.py b/invesalius/data/surface.py
index 632fc72..7be7d19 100644
--- a/invesalius/data/surface.py
+++ b/invesalius/data/surface.py
@@ -188,7 +188,7 @@ class SurfaceManager():
         if imagedata_resolution:
             imagedata = iu.ResampleImage3D(imagedata, imagedata_resolution)
 
-        pipeline_size = 2
+        pipeline_size = 5
         if decimate_reduction:
             pipeline_size += 1
         if (smooth_iterations and smooth_relaxation_factor):
@@ -230,18 +230,24 @@ class SurfaceManager():
 
         # Orient normals from inside to outside
         normals = vtk.vtkPolyDataNormals()
+        normals.AddObserver("ProgressEvent", lambda obj,evt:
+                            UpdateProgress(obj, _("Generating 3D surface...")))
         normals.SetInput(polydata)
         normals.SetFeatureAngle(80)
         normals.AutoOrientNormalsOn()
         normals.GetOutput().ReleaseDataFlagOn()
 
         stripper = vtk.vtkStripper()
+        stripper.AddObserver("ProgressEvent", lambda obj,evt:
+                            UpdateProgress(obj, _("Generating 3D surface...")))
         stripper.SetInput(normals.GetOutput())
         stripper.PassThroughCellIdsOn()
         stripper.PassThroughPointIdsOn()
 
         # Map polygonal data (vtkPolyData) to graphics primitives.
         mapper = vtk.vtkPolyDataMapper()
+        mapper.AddObserver("ProgressEvent", lambda obj,evt:
+                    UpdateProgress(obj, _("Generating 3D surface...")))
         mapper.SetInput(stripper.GetOutput())
         mapper.ScalarVisibilityOff()
 
--
libgit2 0.21.2