2 files changed, 15 insertions, 2 deletions
diff --git a/source/blender/geometry/GEO_add_curves_on_mesh.hh b/source/blender/geometry/GEO_add_curves_on_mesh.hh
index 68c8dc5b76b..2d2ba89a18f 100644
--- a/source/blender/geometry/GEO_add_curves_on_mesh.hh
+++ b/source/blender/geometry/GEO_add_curves_on_mesh.hh
@@ -40,12 +40,19 @@ struct AddCurvesOnMeshInputs {
    * interpolation is used.
    */
   KDTree_3d *old_roots_kdtree = nullptr;
+
+  bool r_uv_error = false;
+};
+
+struct AddCurvesOnMeshOutputs {
+  bool uv_error = false;
 };
 
 /**
  * Generate new curves on a mesh surface with the given inputs. Existing curves stay intact.
  */
-void add_curves_on_mesh(bke::CurvesGeometry &curves, const AddCurvesOnMeshInputs &inputs);
+AddCurvesOnMeshOutputs add_curves_on_mesh(bke::CurvesGeometry &curves,
+                                          const AddCurvesOnMeshInputs &inputs);
 
 float3 compute_surface_point_normal(const MLoopTri &looptri,
                                     const float3 &bary_coord,
diff --git a/source/blender/geometry/intern/add_curves_on_mesh.cc b/source/blender/geometry/intern/add_curves_on_mesh.cc
index aa04cedb5c5..7184d774a22 100644
--- a/source/blender/geometry/intern/add_curves_on_mesh.cc
+++ b/source/blender/geometry/intern/add_curves_on_mesh.cc
@@ -229,8 +229,11 @@ static void interpolate_position_with_interpolation(CurvesGeometry &curves,
   });
 }
 
-void add_curves_on_mesh(CurvesGeometry &curves, const AddCurvesOnMeshInputs &inputs)
+AddCurvesOnMeshOutputs add_curves_on_mesh(CurvesGeometry &curves,
+                                          const AddCurvesOnMeshInputs &inputs)
 {
+  AddCurvesOnMeshOutputs outputs;
+
   const bool use_interpolation = inputs.interpolate_length || inputs.interpolate_point_count ||
                                  inputs.interpolate_shape;
 
@@ -244,6 +247,7 @@ void add_curves_on_mesh(CurvesGeometry &curves, const AddCurvesOnMeshInputs &inp
     const float2 &uv = inputs.uvs[i];
     const ReverseUVSampler::Result result = inputs.reverse_uv_sampler->sample(uv);
     if (result.type != ReverseUVSampler::ResultType::Ok) {
+      outputs.uv_error = true;
       continue;
     }
     const MLoopTri &looptri = *result.looptri;
@@ -365,6 +369,8 @@ void add_curves_on_mesh(CurvesGeometry &curves, const AddCurvesOnMeshInputs &inp
   MutableSpan<int8_t> types_span = curves.curve_types_for_write();
   types_span.drop_front(old_curves_num).fill(CURVE_TYPE_CATMULL_ROM);
   curves.update_curve_types();
+
+  return outputs;
 }
 
 }  // namespace blender::geometry