source/blender/blenkernel/intern/multires_reshape.cc

@@ -62,13 +62,8 @@ bool multiresModifier_reshapeFromObject(Depsgraph *depsgraph,
   Object *src_eval = DEG_get_evaluated_object(depsgraph, src);
   Mesh *src_mesh_eval = mesh_get_eval_final(depsgraph, scene_eval, src_eval, &CD_MASK_BAREMESH);
 
-  int num_deformed_verts;
-  float(*deformed_verts)[3] = BKE_mesh_vert_coords_alloc(src_mesh_eval, &num_deformed_verts);
-
   const bool result = multiresModifier_reshapeFromVertcos(
-      depsgraph, dst, mmd, deformed_verts, num_deformed_verts);
-
-  MEM_freeN(deformed_verts);
+      depsgraph, dst, mmd, BKE_mesh_vert_positions(src_mesh_eval), src_mesh_eval->totvert);
 
   return result;
 }

source/blender/blenkernel/intern/paint.cc

@@ -2209,10 +2209,8 @@ static PBVH *build_pbvh_from_regular_mesh(Object *ob, Mesh *me_eval_deform, bool
 
   const bool is_deformed = check_sculpt_object_deformed(ob, true);
   if (is_deformed && me_eval_deform != nullptr) {
-    int totvert;
-    float(*v_cos)[3] = BKE_mesh_vert_coords_alloc(me_eval_deform, &totvert);
-    BKE_pbvh_vert_coords_apply(pbvh, v_cos, totvert);
-    MEM_freeN(v_cos);
+    BKE_pbvh_vert_coords_apply(
+        pbvh, BKE_mesh_vert_positions(me_eval_deform), me_eval_deform->totvert);
   }
 
   return pbvh;

source/blender/blenkernel/intern/particle_system.c

@@ -3441,7 +3441,6 @@ static void do_hair_dynamics(ParticleSimulationData *sim)
   EffectorWeights *clmd_effweights;
   int totpoint;
   int totedge;
-  float(*deformedVerts)[3];
   bool realloc_roots;
 
   if (!psys->clmd) {
@@ -3495,12 +3494,12 @@ static void do_hair_dynamics(ParticleSimulationData *sim)
   psys->clmd->sim_parms->effector_weights = psys->part->effector_weights;
 
   BKE_id_copy_ex(NULL, &psys->hair_in_mesh->id, (ID **)&psys->hair_out_mesh, LIB_ID_COPY_LOCALIZE);
-  deformedVerts = BKE_mesh_vert_coords_alloc(psys->hair_out_mesh, NULL);
-  clothModifier_do(
-      psys->clmd, sim->depsgraph, sim->scene, sim->ob, psys->hair_in_mesh, deformedVerts);
-  BKE_mesh_vert_coords_apply(psys->hair_out_mesh, deformedVerts);
-
-  MEM_freeN(deformedVerts);
+  clothModifier_do(psys->clmd,
+                   sim->depsgraph,
+                   sim->scene,
+                   sim->ob,
+                   psys->hair_in_mesh,
+                   BKE_mesh_vert_positions_for_write(psys->hair_in_mesh));
 
   /* restore cloth effector weights */
   psys->clmd->sim_parms->effector_weights = clmd_effweights;

source/blender/blenkernel/intern/shrinkwrap.cc

@@ -1530,7 +1530,6 @@ void BKE_shrinkwrap_mesh_nearest_surface_deform(bContext *C, Object *ob_source,
   Scene *sce = CTX_data_scene(C);
   ShrinkwrapModifierData ssmd = {{nullptr}};
   ModifierEvalContext ctx = {depsgraph, ob_source, ModifierApplyFlag(0)};
-  int totvert;
 
   ssmd.target = ob_target;
   ssmd.shrinkType = MOD_SHRINKWRAP_NEAREST_SURFACE;
@@ -1538,13 +1537,16 @@ void BKE_shrinkwrap_mesh_nearest_surface_deform(bContext *C, Object *ob_source,
   ssmd.keepDist = 0.0f;
 
   Mesh *src_me = static_cast<Mesh *>(ob_source->data);
-  float(*vertexCos)[3] = BKE_mesh_vert_coords_alloc(src_me, &totvert);
 
-  shrinkwrapModifier_deform(&ssmd, &ctx, sce, ob_source, src_me, nullptr, -1, vertexCos, totvert);
-
-  BKE_mesh_vert_coords_apply(src_me, vertexCos);
-
-  MEM_freeN(vertexCos);
+  shrinkwrapModifier_deform(&ssmd,
+                            &ctx,
+                            sce,
+                            ob_source,
+                            src_me,
+                            nullptr,
+                            -1,
+                            BKE_mesh_vert_positions_for_write(src_me),
+                            src_me->totvert);
 }
 
 void BKE_shrinkwrap_remesh_target_project(Mesh *src_me, Mesh *target_me, Object *ob_target)

source/blender/modifiers/intern/MOD_weightvgproximity.cc

@@ -516,12 +516,11 @@ static Mesh *modifyMesh(ModifierData *md, const ModifierEvalContext *ctx, Mesh *
 
   /* Get our vertex coordinates. */
   if (index_num != verts_num) {
-    float(*tv_cos)[3] = BKE_mesh_vert_coords_alloc(mesh, nullptr);
+    const float(*tv_cos)[3] = BKE_mesh_vert_positions(mesh);
     v_cos = static_cast<float(*)[3]>(MEM_malloc_arrayN(index_num, sizeof(float[3]), __func__));
     for (i = 0; i < index_num; i++) {
       copy_v3_v3(v_cos[i], tv_cos[indices[i]]);
     }
-    MEM_freeN(tv_cos);
   }
   else {
     v_cos = BKE_mesh_vert_coords_alloc(mesh, nullptr);