@@ -440,1 +440,4 @@
 
+Span<MDeformVert> CurvesGeometry::deform_verts() const
+{
+  const MDeformVert *dverts = (const MDeformVert *)CustomData_get_layer(&this->point_data,

@@ -0,0 +21,4 @@
+
+namespace blender::bke {
+
+class VArrayImpl_For_VertexWeights final : public VMutableArrayImpl<float> {

@@ -60,6 +61,10 @@ CurvesGeometry::CurvesGeometry(const int point_num, const int curve_num)
   CustomData_reset(&this->point_data);
   CustomData_reset(&this->curve_data);
 
+  /* Make sure to clear this before using the attributes API. Otherwise the vertex group accessor

@@ -144,2 +152,4 @@
   std::swap(dst.curve_offsets, src.curve_offsets);
 
+  dst.vertex_group_active_index = src.vertex_group_active_index;
+  std::swap(dst.vertex_group_names.first, src.vertex_group_names.first);

@@ -293,2 +298,4 @@
                                                float *r_weights);
 
+namespace blender::bke {
+VArray<float> varray_for_deform_verts(Span<MDeformVert> dverts, const int dvert_index);

@@ -461,0 +486,4 @@
+  if (dvert != nullptr) {
+    return {dvert, this->point_num};
+  }
+  return {(MDeformVert *)CustomData_add_layer(

@@ -489,2 +494,4 @@
       return &gpd->vertex_group_active_index;
     }
+    case OB_CURVES: {
+      const Curves *curves_id = static_cast<const Curves *>(ob->data);

@@ -334,0 +408,4 @@
+      for (MDeformVert &dvert : dverts.slice(range)) {
+        MDeformWeight *weight = BKE_defvert_find_index(&dvert, index);
+        BKE_defvert_remove_group(&dvert, weight);
+        for (MDeformWeight &weight : MutableSpan(dvert.dw, dvert.totweight)) {

@@ -122,0 +123,4 @@
+      return lt->dvert;
+    }
+    case ID_CV: {
+      Curves *curves_id = reinterpret_cast<Curves *>(id);

@@ -146,0 +151,4 @@
+  std::swap(dst.vertex_group_names.first, src.vertex_group_names.first);
+  std::swap(dst.vertex_group_names.last, src.vertex_group_names.last);
+  std::swap(dst.vertex_group_active_index, src.vertex_group_active_index);
+  src.vertex_group_active_index = 0;

@@ -25,6 +25,8 @@
 #include "BKE_attribute_math.hh"
 #include "BKE_curves.h"
 
+#include "DNA_meshdata_types.h"