Fix: Curves sculpt adding resets attribute values

Error in 9088a1f4764f371f7.

1 files changed, 4 insertions, 3 deletions

diff --git a/source/blender/geometry/intern/add_curves_on_mesh.cc b/source/blender/geometry/intern/add_curves_on_mesh.cc
index 25935691bf4..a03c9b994a9 100644
--- a/source/blender/geometry/intern/add_curves_on_mesh.cc
+++ b/source/blender/geometry/intern/add_curves_on_mesh.cc
@@ -385,10 +385,11 @@ AddCurvesOnMeshOutputs add_curves_on_mesh(CurvesGeometry &curves,
           return true;
         }
         bke::GSpanAttributeWriter attribute = attributes.lookup_for_write_span(id);
-        const int new_elements_num = attribute.domain == ATTR_DOMAIN_POINT ? new_points_num :
-                                                                             new_curves_num;
+        /* The new elements are added at the end of the array. */
+        const int old_elements_num = attribute.domain == ATTR_DOMAIN_POINT ? old_points_num :
+                                                                             old_curves_num;
         const CPPType &type = attribute.span.type();
-        GMutableSpan new_data = attribute.span.take_back(new_elements_num);
+        GMutableSpan new_data = attribute.span.drop_front(old_elements_num);
         type.fill_assign_n(type.default_value(), new_data.data(), new_data.size());
         attribute.finish();
         return true;