Merge branch 'master' into geometry-nodes-iterative-cachegeometry-nodes-rigid-body-integration

1 files changed, 652 insertions, 0 deletions

diff --git a/source/blender/blenkernel/intern/crazyspace.cc b/source/blender/blenkernel/intern/crazyspace.cc
new file mode 100644
index 00000000000..978606ef1fa
--- /dev/null
+++ b/source/blender/blenkernel/intern/crazyspace.cc
@@ -0,0 +1,652 @@
+/* SPDX-License-Identifier: GPL-2.0-or-later
+ * Copyright 2005 Blender Foundation. All rights reserved. */
+
+/** \file
+ * \ingroup bke
+ */
+
+#include "MEM_guardedalloc.h"
+
+#include "DNA_mesh_types.h"
+#include "DNA_meshdata_types.h"
+#include "DNA_modifier_types.h"
+#include "DNA_object_types.h"
+#include "DNA_scene_types.h"
+
+#include "BLI_bitmap.h"
+#include "BLI_linklist.h"
+#include "BLI_utildefines.h"
+
+#include "BKE_DerivedMesh.h"
+#include "BKE_crazyspace.h"
+#include "BKE_crazyspace.hh"
+#include "BKE_curves.hh"
+#include "BKE_editmesh.h"
+#include "BKE_geometry_set.hh"
+#include "BKE_lib_id.h"
+#include "BKE_mesh.h"
+#include "BKE_mesh_wrapper.h"
+#include "BKE_modifier.h"
+#include "BKE_multires.h"
+#include "BKE_report.h"
+
+#include "DEG_depsgraph_query.h"
+
+BLI_INLINE void tan_calc_quat_v3(float r_quat[4],
+                                 const float co_1[3],
+                                 const float co_2[3],
+                                 const float co_3[3])
+{
+  float vec_u[3], vec_v[3];
+  float nor[3];
+
+  sub_v3_v3v3(vec_u, co_1, co_2);
+  sub_v3_v3v3(vec_v, co_1, co_3);
+
+  cross_v3_v3v3(nor, vec_u, vec_v);
+
+  if (normalize_v3(nor) > FLT_EPSILON) {
+    const float zero_vec[3] = {0.0f};
+    tri_to_quat_ex(r_quat, zero_vec, vec_u, vec_v, nor);
+  }
+  else {
+    unit_qt(r_quat);
+  }
+}
+
+static void set_crazy_vertex_quat(float r_quat[4],
+                                  const float co_1[3],
+                                  const float co_2[3],
+                                  const float co_3[3],
+                                  const float vd_1[3],
+                                  const float vd_2[3],
+                                  const float vd_3[3])
+{
+  float q1[4], q2[4];
+
+  tan_calc_quat_v3(q1, co_1, co_2, co_3);
+  tan_calc_quat_v3(q2, vd_1, vd_2, vd_3);
+
+  sub_qt_qtqt(r_quat, q2, q1);
+}
+
+static bool modifiers_disable_subsurf_temporary(struct Scene *scene, Object *ob)
+{
+  bool disabled = false;
+  int cageIndex = BKE_modifiers_get_cage_index(scene, ob, nullptr, 1);
+
+  ModifierData *md = static_cast<ModifierData *>(ob->modifiers.first);
+  for (int i = 0; md && i <= cageIndex; i++, md = md->next) {
+    if (md->type == eModifierType_Subsurf) {
+      md->mode ^= eModifierMode_DisableTemporary;
+      disabled = true;
+    }
+  }
+
+  return disabled;
+}
+
+float (*BKE_crazyspace_get_mapped_editverts(struct Depsgraph *depsgraph, Object *obedit))[3]
+{
+  Scene *scene = DEG_get_input_scene(depsgraph);
+  Scene *scene_eval = DEG_get_evaluated_scene(depsgraph);
+  Object *obedit_eval = DEG_get_evaluated_object(depsgraph, obedit);
+  Mesh *mesh_eval = static_cast<Mesh *>(obedit_eval->data);
+  BMEditMesh *editmesh_eval = mesh_eval->edit_mesh;
+
+  /* disable subsurf temporal, get mapped cos, and enable it */
+  if (modifiers_disable_subsurf_temporary(scene_eval, obedit_eval)) {
+    /* need to make new derivemesh */
+    makeDerivedMesh(depsgraph, scene_eval, obedit_eval, &CD_MASK_BAREMESH);
+  }
+
+  /* now get the cage */
+  Mesh *mesh_eval_cage = editbmesh_get_eval_cage_from_orig(
+      depsgraph, scene, obedit, &CD_MASK_BAREMESH);
+
+  const int nverts = editmesh_eval->bm->totvert;
+  float(*vertexcos)[3] = static_cast<float(*)[3]>(
+      MEM_mallocN(sizeof(*vertexcos) * nverts, "vertexcos map"));
+  mesh_get_mapped_verts_coords(mesh_eval_cage, vertexcos, nverts);
+
+  /* set back the flag, no new cage needs to be built, transform does it */
+  modifiers_disable_subsurf_temporary(scene_eval, obedit_eval);
+
+  return vertexcos;
+}
+
+void BKE_crazyspace_set_quats_editmesh(BMEditMesh *em,
+                                       float (*origcos)[3],
+                                       float (*mappedcos)[3],
+                                       float (*quats)[4],
+                                       const bool use_select)
+{
+  BMFace *f;
+  BMIter iter;
+  int index;
+
+  {
+    BMVert *v;
+    BM_ITER_MESH_INDEX (v, &iter, em->bm, BM_VERTS_OF_MESH, index) {
+      BM_elem_flag_disable(v, BM_ELEM_TAG);
+      BM_elem_index_set(v, index); /* set_inline */
+    }
+    em->bm->elem_index_dirty &= ~BM_VERT;
+  }
+
+  BM_ITER_MESH (f, &iter, em->bm, BM_FACES_OF_MESH) {
+    BMLoop *l_iter, *l_first;
+
+    l_iter = l_first = BM_FACE_FIRST_LOOP(f);
+    do {
+      if (BM_elem_flag_test(l_iter->v, BM_ELEM_HIDDEN) ||
+          BM_elem_flag_test(l_iter->v, BM_ELEM_TAG) ||
+          (use_select && !BM_elem_flag_test(l_iter->v, BM_ELEM_SELECT))) {
+        continue;
+      }
+
+      if (!BM_elem_flag_test(l_iter->v, BM_ELEM_TAG)) {
+        const float *co_prev, *co_curr, *co_next; /* orig */
+        const float *vd_prev, *vd_curr, *vd_next; /* deform */
+
+        const int i_prev = BM_elem_index_get(l_iter->prev->v);
+        const int i_curr = BM_elem_index_get(l_iter->v);
+        const int i_next = BM_elem_index_get(l_iter->next->v);
+
+        /* retrieve mapped coordinates */
+        vd_prev = mappedcos[i_prev];
+        vd_curr = mappedcos[i_curr];
+        vd_next = mappedcos[i_next];
+
+        if (origcos) {
+          co_prev = origcos[i_prev];
+          co_curr = origcos[i_curr];
+          co_next = origcos[i_next];
+        }
+        else {
+          co_prev = l_iter->prev->v->co;
+          co_curr = l_iter->v->co;
+          co_next = l_iter->next->v->co;
+        }
+
+        set_crazy_vertex_quat(quats[i_curr], co_curr, co_next, co_prev, vd_curr, vd_next, vd_prev);
+
+        BM_elem_flag_enable(l_iter->v, BM_ELEM_TAG);
+      }
+    } while ((l_iter = l_iter->next) != l_first);
+  }
+}
+
+void BKE_crazyspace_set_quats_mesh(Mesh *me,
+                                   float (*origcos)[3],
+                                   float (*mappedcos)[3],
+                                   float (*quats)[4])
+{
+  BLI_bitmap *vert_tag = BLI_BITMAP_NEW(me->totvert, __func__);
+
+  /* first store two sets of tangent vectors in vertices, we derive it just from the face-edges */
+  MVert *mvert = me->mvert;
+  MPoly *mp = me->mpoly;
+  MLoop *mloop = me->mloop;
+
+  for (int i = 0; i < me->totpoly; i++, mp++) {
+    MLoop *ml_next = &mloop[mp->loopstart];
+    MLoop *ml_curr = &ml_next[mp->totloop - 1];
+    MLoop *ml_prev = &ml_next[mp->totloop - 2];
+
+    for (int j = 0; j < mp->totloop; j++) {
+      if (!BLI_BITMAP_TEST(vert_tag, ml_curr->v)) {
+        const float *co_prev, *co_curr, *co_next; /* orig */
+        const float *vd_prev, *vd_curr, *vd_next; /* deform */
+
+        /* retrieve mapped coordinates */
+        vd_prev = mappedcos[ml_prev->v];
+        vd_curr = mappedcos[ml_curr->v];
+        vd_next = mappedcos[ml_next->v];
+
+        if (origcos) {
+          co_prev = origcos[ml_prev->v];
+          co_curr = origcos[ml_curr->v];
+          co_next = origcos[ml_next->v];
+        }
+        else {
+          co_prev = mvert[ml_prev->v].co;
+          co_curr = mvert[ml_curr->v].co;
+          co_next = mvert[ml_next->v].co;
+        }
+
+        set_crazy_vertex_quat(
+            quats[ml_curr->v], co_curr, co_next, co_prev, vd_curr, vd_next, vd_prev);
+
+        BLI_BITMAP_ENABLE(vert_tag, ml_curr->v);
+      }
+
+      ml_prev = ml_curr;
+      ml_curr = ml_next;
+      ml_next++;
+    }
+  }
+
+  MEM_freeN(vert_tag);
+}
+
+int BKE_crazyspace_get_first_deform_matrices_editbmesh(struct Depsgraph *depsgraph,
+                                                       Scene *scene,
+                                                       Object *ob,
+                                                       BMEditMesh *em,
+                                                       float (**deformmats)[3][3],
+                                                       float (**deformcos)[3])
+{
+  ModifierData *md;
+  Mesh *me_input = static_cast<Mesh *>(ob->data);
+  Mesh *me = nullptr;
+  int i, a, modifiers_left_num = 0, verts_num = 0;
+  int cageIndex = BKE_modifiers_get_cage_index(scene, ob, nullptr, 1);
+  float(*defmats)[3][3] = nullptr, (*deformedVerts)[3] = nullptr;
+  VirtualModifierData virtualModifierData;
+  ModifierEvalContext mectx = {depsgraph, ob, ModifierApplyFlag(0)};
+
+  BKE_modifiers_clear_errors(ob);
+
+  md = BKE_modifiers_get_virtual_modifierlist(ob, &virtualModifierData);
+
+  /* compute the deformation matrices and coordinates for the first
+   * modifiers with on cage editing that are enabled and support computing
+   * deform matrices */
+  for (i = 0; md && i <= cageIndex; i++, md = md->next) {
+    const ModifierTypeInfo *mti = BKE_modifier_get_info(static_cast<ModifierType>(md->type));
+
+    if (!editbmesh_modifier_is_enabled(scene, ob, md, me != nullptr)) {
+      continue;
+    }
+
+    if (mti->type == eModifierTypeType_OnlyDeform && mti->deformMatricesEM) {
+      if (!defmats) {
+        const int required_mode = eModifierMode_Realtime | eModifierMode_Editmode;
+        CustomData_MeshMasks cd_mask_extra = CD_MASK_BAREMESH;
+        CDMaskLink *datamasks = BKE_modifier_calc_data_masks(
+            scene, ob, md, &cd_mask_extra, required_mode, nullptr, nullptr);
+        cd_mask_extra = datamasks->mask;
+        BLI_linklist_free((LinkNode *)datamasks, nullptr);
+
+        me = BKE_mesh_wrapper_from_editmesh_with_coords(em, &cd_mask_extra, nullptr, me_input);
+        deformedVerts = editbmesh_vert_coords_alloc(em, &verts_num);
+        defmats = static_cast<float(*)[3][3]>(
+            MEM_mallocN(sizeof(*defmats) * verts_num, "defmats"));
+
+        for (a = 0; a < verts_num; a++) {
+          unit_m3(defmats[a]);
+        }
+      }
+      mti->deformMatricesEM(md, &mectx, em, me, deformedVerts, defmats, verts_num);
+    }
+    else {
+      break;
+    }
+  }
+
+  for (; md && i <= cageIndex; md = md->next, i++) {
+    if (editbmesh_modifier_is_enabled(scene, ob, md, me != nullptr) &&
+        BKE_modifier_is_correctable_deformed(md)) {
+      modifiers_left_num++;
+    }
+  }
+
+  if (me) {
+    BKE_id_free(nullptr, me);
+  }
+
+  *deformmats = defmats;
+  *deformcos = deformedVerts;
+
+  return modifiers_left_num;
+}
+
+/**
+ * Crazy-space evaluation needs to have an object which has all the fields
+ * evaluated, but the mesh data being at undeformed state. This way it can
+ * re-apply modifiers and also have proper pointers to key data blocks.
+ *
+ * Similar to #BKE_object_eval_reset(), but does not modify the actual evaluated object.
+ */
+static void crazyspace_init_object_for_eval(struct Depsgraph *depsgraph,
+                                            Object *object,
+                                            Object *object_crazy)
+{
+  Object *object_eval = DEG_get_evaluated_object(depsgraph, object);
+  *object_crazy = blender::dna::shallow_copy(*object_eval);
+  if (object_crazy->runtime.data_orig != nullptr) {
+    object_crazy->data = object_crazy->runtime.data_orig;
+  }
+}
+
+static void crazyspace_init_verts_and_matrices(const Mesh *mesh,
+                                               float (**deformmats)[3][3],
+                                               float (**deformcos)[3])
+{
+  int verts_num;
+  *deformcos = BKE_mesh_vert_coords_alloc(mesh, &verts_num);
+  *deformmats = static_cast<float(*)[3][3]>(
+      MEM_callocN(sizeof(**deformmats) * verts_num, "defmats"));
+  for (int a = 0; a < verts_num; a++) {
+    unit_m3((*deformmats)[a]);
+  }
+  BLI_assert(verts_num == mesh->totvert);
+}
+
+static bool crazyspace_modifier_supports_deform_matrices(ModifierData *md)
+{
+  if (ELEM(md->type, eModifierType_Subsurf, eModifierType_Multires)) {
+    return true;
+  }
+  const ModifierTypeInfo *mti = BKE_modifier_get_info(static_cast<ModifierType>(md->type));
+  return (mti->type == eModifierTypeType_OnlyDeform);
+}
+
+static bool crazyspace_modifier_supports_deform(ModifierData *md)
+{
+  const ModifierTypeInfo *mti = BKE_modifier_get_info(static_cast<ModifierType>(md->type));
+  return (mti->type == eModifierTypeType_OnlyDeform);
+}
+
+int BKE_sculpt_get_first_deform_matrices(struct Depsgraph *depsgraph,
+                                         Scene *scene,
+                                         Object *object,
+                                         float (**deformmats)[3][3],
+                                         float (**deformcos)[3])
+{
+  ModifierData *md;
+  Mesh *me_eval = nullptr;
+  float(*defmats)[3][3] = nullptr, (*deformedVerts)[3] = nullptr;
+  int modifiers_left_num = 0;
+  VirtualModifierData virtualModifierData;
+  Object object_eval;
+  crazyspace_init_object_for_eval(depsgraph, object, &object_eval);
+  MultiresModifierData *mmd = get_multires_modifier(scene, &object_eval, 0);
+  const bool is_sculpt_mode = (object->mode & OB_MODE_SCULPT) != 0;
+  const bool has_multires = mmd != nullptr && mmd->sculptlvl > 0;
+  const ModifierEvalContext mectx = {depsgraph, &object_eval, ModifierApplyFlag(0)};
+
+  if (is_sculpt_mode && has_multires) {
+    *deformmats = nullptr;
+    *deformcos = nullptr;
+    return modifiers_left_num;
+  }
+
+  md = BKE_modifiers_get_virtual_modifierlist(&object_eval, &virtualModifierData);
+
+  for (; md; md = md->next) {
+    if (!BKE_modifier_is_enabled(scene, md, eModifierMode_Realtime)) {
+      continue;
+    }
+
+    if (crazyspace_modifier_supports_deform_matrices(md)) {
+      const ModifierTypeInfo *mti = BKE_modifier_get_info(static_cast<ModifierType>(md->type));
+      if (defmats == nullptr) {
+        /* NOTE: Evaluated object is re-set to its original un-deformed state. */
+        Mesh *me = static_cast<Mesh *>(object_eval.data);
+        me_eval = BKE_mesh_copy_for_eval(me, true);
+        crazyspace_init_verts_and_matrices(me_eval, &defmats, &deformedVerts);
+      }
+
+      if (mti->deformMatrices) {
+        mti->deformMatrices(md, &mectx, me_eval, deformedVerts, defmats, me_eval->totvert);
+      }
+      else {
+        /* More complex handling will continue in BKE_crazyspace_build_sculpt.
+         * Exiting the loop on a non-deform modifier causes issues - T71213. */
+        BLI_assert(crazyspace_modifier_supports_deform(md));
+        break;
+      }
+    }
+  }
+
+  for (; md; md = md->next) {
+    if (!BKE_modifier_is_enabled(scene, md, eModifierMode_Realtime)) {
+      continue;
+    }
+
+    if (crazyspace_modifier_supports_deform(md)) {
+      modifiers_left_num++;
+    }
+  }
+
+  if (me_eval != nullptr) {
+    BKE_id_free(nullptr, me_eval);
+  }
+
+  *deformmats = defmats;
+  *deformcos = deformedVerts;
+
+  return modifiers_left_num;
+}
+
+void BKE_crazyspace_build_sculpt(struct Depsgraph *depsgraph,
+                                 Scene *scene,
+                                 Object *object,
+                                 float (**deformmats)[3][3],
+                                 float (**deformcos)[3])
+{
+  int totleft = BKE_sculpt_get_first_deform_matrices(
+      depsgraph, scene, object, deformmats, deformcos);
+
+  if (totleft) {
+    /* There are deformation modifier which doesn't support deformation matrices calculation.
+     * Need additional crazy-space correction. */
+
+    Mesh *mesh = (Mesh *)object->data;
+    Mesh *mesh_eval = nullptr;
+
+    if (*deformcos == nullptr) {
+      crazyspace_init_verts_and_matrices(mesh, deformmats, deformcos);
+    }
+
+    float(*deformedVerts)[3] = *deformcos;
+    float(*origVerts)[3] = static_cast<float(*)[3]>(MEM_dupallocN(deformedVerts));
+    float(*quats)[4];
+    int i, deformed = 0;
+    VirtualModifierData virtualModifierData;
+    Object object_eval;
+    crazyspace_init_object_for_eval(depsgraph, object, &object_eval);
+    ModifierData *md = BKE_modifiers_get_virtual_modifierlist(&object_eval, &virtualModifierData);
+    const ModifierEvalContext mectx = {depsgraph, &object_eval, ModifierApplyFlag(0)};
+
+    for (; md; md = md->next) {
+      if (!BKE_modifier_is_enabled(scene, md, eModifierMode_Realtime)) {
+        continue;
+      }
+
+      if (crazyspace_modifier_supports_deform(md)) {
+        const ModifierTypeInfo *mti = BKE_modifier_get_info(static_cast<ModifierType>(md->type));
+
+        /* skip leading modifiers which have been already
+         * handled in sculpt_get_first_deform_matrices */
+        if (mti->deformMatrices && !deformed) {
+          continue;
+        }
+
+        if (mesh_eval == nullptr) {
+          mesh_eval = BKE_mesh_copy_for_eval(mesh, true);
+        }
+
+        mti->deformVerts(md, &mectx, mesh_eval, deformedVerts, mesh_eval->totvert);
+        deformed = 1;
+      }
+    }
+
+    quats = static_cast<float(*)[4]>(MEM_mallocN(mesh->totvert * sizeof(*quats), "crazy quats"));
+
+    BKE_crazyspace_set_quats_mesh(mesh, origVerts, deformedVerts, quats);
+
+    for (i = 0; i < mesh->totvert; i++) {
+      float qmat[3][3], tmat[3][3];
+
+      quat_to_mat3(qmat, quats[i]);
+      mul_m3_m3m3(tmat, qmat, (*deformmats)[i]);
+      copy_m3_m3((*deformmats)[i], tmat);
+    }
+
+    MEM_freeN(origVerts);
+    MEM_freeN(quats);
+
+    if (mesh_eval != nullptr) {
+      BKE_id_free(nullptr, mesh_eval);
+    }
+  }
+
+  if (*deformmats == nullptr) {
+    int a, verts_num;
+    Mesh *mesh = (Mesh *)object->data;
+
+    *deformcos = BKE_mesh_vert_coords_alloc(mesh, &verts_num);
+    *deformmats = static_cast<float(*)[3][3]>(
+        MEM_callocN(sizeof(*(*deformmats)) * verts_num, "defmats"));
+
+    for (a = 0; a < verts_num; a++) {
+      unit_m3((*deformmats)[a]);
+    }
+  }
+}
+
+/* -------------------------------------------------------------------- */
+/** \name Crazyspace API
+ * \{ */
+
+void BKE_crazyspace_api_eval(Depsgraph *depsgraph,
+                             Scene *scene,
+                             Object *object,
+                             struct ReportList *reports)
+{
+  if (object->runtime.crazyspace_deform_imats != nullptr ||
+      object->runtime.crazyspace_deform_cos != nullptr) {
+    return;
+  }
+
+  if (object->type != OB_MESH) {
+    BKE_report(reports,
+               RPT_ERROR,
+               "Crazyspace transformation is only available for Mesh type of objects");
+    return;
+  }
+
+  const Mesh *mesh = (const Mesh *)object->data;
+  object->runtime.crazyspace_verts_num = mesh->totvert;
+  BKE_crazyspace_build_sculpt(depsgraph,
+                              scene,
+                              object,
+                              &object->runtime.crazyspace_deform_imats,
+                              &object->runtime.crazyspace_deform_cos);
+}
+
+void BKE_crazyspace_api_displacement_to_deformed(struct Object *object,
+                                                 struct ReportList *reports,
+                                                 int vertex_index,
+                                                 float displacement[3],
+                                                 float r_displacement_deformed[3])
+{
+  if (vertex_index < 0 || vertex_index >= object->runtime.crazyspace_verts_num) {
+    BKE_reportf(reports,
+                RPT_ERROR,
+                "Invalid vertex index %d (expected to be within 0 to %d range)",
+                vertex_index,
+                object->runtime.crazyspace_verts_num);
+    return;
+  }
+
+  mul_v3_m3v3(r_displacement_deformed,
+              object->runtime.crazyspace_deform_imats[vertex_index],
+              displacement);
+}
+
+void BKE_crazyspace_api_displacement_to_original(struct Object *object,
+                                                 struct ReportList *reports,
+                                                 int vertex_index,
+                                                 float displacement_deformed[3],
+                                                 float r_displacement[3])
+{
+  if (vertex_index < 0 || vertex_index >= object->runtime.crazyspace_verts_num) {
+    BKE_reportf(reports,
+                RPT_ERROR,
+                "Invalid vertex index %d (expected to be within 0 to %d range))",
+                vertex_index,
+                object->runtime.crazyspace_verts_num);
+    return;
+  }
+
+  float mat[3][3];
+  if (!invert_m3_m3(mat, object->runtime.crazyspace_deform_imats[vertex_index])) {
+    copy_v3_v3(r_displacement, displacement_deformed);
+    return;
+  }
+
+  mul_v3_m3v3(r_displacement, mat, displacement_deformed);
+}
+
+void BKE_crazyspace_api_eval_clear(Object *object)
+{
+  MEM_SAFE_FREE(object->runtime.crazyspace_deform_imats);
+  MEM_SAFE_FREE(object->runtime.crazyspace_deform_cos);
+}
+
+/** \} */
+
+namespace blender::bke::crazyspace {
+
+GeometryDeformation get_evaluated_curves_deformation(const Depsgraph &depsgraph,
+                                                     const Object &ob_orig)
+{
+  BLI_assert(ob_orig.type == OB_CURVES);
+  const Curves &curves_id_orig = *static_cast<const Curves *>(ob_orig.data);
+  const CurvesGeometry &curves_orig = CurvesGeometry::wrap(curves_id_orig.geometry);
+  const int points_num = curves_orig.points_num();
+
+  GeometryDeformation deformation;
+  /* Use the undeformed positions by default. */
+  deformation.positions = curves_orig.positions();
+
+  const Object *ob_eval = DEG_get_evaluated_object(&depsgraph, const_cast<Object *>(&ob_orig));
+  if (ob_eval == nullptr) {
+    return deformation;
+  }
+  const GeometrySet *geometry_eval = ob_eval->runtime.geometry_set_eval;
+  if (geometry_eval == nullptr) {
+    return deformation;
+  }
+
+  /* If available, use deformation information generated during evaluation. */
+  const GeometryComponentEditData *edit_component_eval =
+      geometry_eval->get_component_for_read<GeometryComponentEditData>();
+  bool uses_extra_positions = false;
+  if (edit_component_eval != nullptr) {
+    const CurvesEditHints *edit_hints = edit_component_eval->curves_edit_hints_.get();
+    if (edit_hints != nullptr && &edit_hints->curves_id_orig == &curves_id_orig) {
+      if (edit_hints->positions.has_value()) {
+        BLI_assert(edit_hints->positions->size() == points_num);
+        deformation.positions = *edit_hints->positions;
+        uses_extra_positions = true;
+      }
+      if (edit_hints->deform_mats.has_value()) {
+        BLI_assert(edit_hints->deform_mats->size() == points_num);
+        deformation.deform_mats = *edit_hints->deform_mats;
+      }
+    }
+  }
+
+  /* Use the positions of the evaluated curves directly, if the number of points matches. */
+  if (!uses_extra_positions) {
+    const CurveComponent *curves_component_eval =
+        geometry_eval->get_component_for_read<CurveComponent>();
+    if (curves_component_eval != nullptr) {
+      const Curves *curves_id_eval = curves_component_eval->get_for_read();
+      if (curves_id_eval != nullptr) {
+        const CurvesGeometry &curves_eval = CurvesGeometry::wrap(curves_id_eval->geometry);
+        if (curves_eval.points_num() == points_num) {
+          deformation.positions = curves_eval.positions();
+        }
+      }
+    }
+  }
+  return deformation;
+}
+
+}  // namespace blender::bke::crazyspace