122 lines
3.2 KiB
C++
122 lines
3.2 KiB
C++
/* SPDX-FileCopyrightText: 2023 Blender Authors
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*
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* SPDX-License-Identifier: GPL-2.0-or-later */
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/** \file
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* \ingroup bke
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*
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* Manage edit mesh cache: #EditMeshData
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*/
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#include "BLI_bounds.hh"
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#include "BLI_math_vector.h"
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#include "BLI_span.hh"
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#include "BKE_editmesh.hh"
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#include "BKE_editmesh_cache.hh" /* own include */
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using blender::float3;
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using blender::Span;
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/* -------------------------------------------------------------------- */
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/** \name Ensure Data (derived from coords)
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* \{ */
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Span<float3> BKE_editmesh_cache_ensure_face_normals(BMEditMesh &em,
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blender::bke::EditMeshData &emd)
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{
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if (emd.vert_positions.is_empty() || !emd.face_normals.is_empty()) {
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return emd.face_normals;
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}
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BMesh *bm = em.bm;
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emd.face_normals.reinitialize(bm->totface);
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BM_mesh_elem_index_ensure(bm, BM_VERT);
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BMFace *efa;
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BMIter fiter;
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int i;
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BM_ITER_MESH_INDEX (efa, &fiter, bm, BM_FACES_OF_MESH, i) {
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BM_elem_index_set(efa, i); /* set_inline */
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BM_face_calc_normal_vcos(bm, efa, emd.face_normals[i], emd.vert_positions);
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}
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bm->elem_index_dirty &= ~BM_FACE;
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return emd.face_normals;
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}
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Span<float3> BKE_editmesh_cache_ensure_vert_normals(BMEditMesh &em,
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blender::bke::EditMeshData &emd)
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{
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if (emd.vert_positions.is_empty() || !emd.vert_normals.is_empty()) {
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return emd.vert_normals;
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}
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BMesh *bm = em.bm;
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/* Calculate vertex normals from face normals. */
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const Span<float3> face_normals = BKE_editmesh_cache_ensure_face_normals(em, emd);
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emd.vert_normals.reinitialize(bm->totvert);
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BM_mesh_elem_index_ensure(bm, BM_FACE);
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BM_verts_calc_normal_vcos(bm, face_normals, emd.vert_positions, emd.vert_normals);
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return emd.vert_normals;
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}
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Span<float3> BKE_editmesh_cache_ensure_face_centers(BMEditMesh &em,
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blender::bke::EditMeshData &emd)
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{
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if (!emd.face_centers.is_empty()) {
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return emd.face_centers;
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}
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BMesh *bm = em.bm;
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emd.face_centers.reinitialize(bm->totface);
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BMFace *efa;
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BMIter fiter;
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int i;
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if (emd.vert_positions.is_empty()) {
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BM_ITER_MESH_INDEX (efa, &fiter, bm, BM_FACES_OF_MESH, i) {
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BM_face_calc_center_median(efa, emd.face_centers[i]);
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}
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}
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else {
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BM_mesh_elem_index_ensure(bm, BM_VERT);
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BM_ITER_MESH_INDEX (efa, &fiter, bm, BM_FACES_OF_MESH, i) {
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BM_face_calc_center_median_vcos(bm, efa, emd.face_centers[i], emd.vert_positions);
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}
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}
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return emd.face_centers;
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}
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/** \} */
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/* -------------------------------------------------------------------- */
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/** \name Calculate Min/Max
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* \{ */
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std::optional<blender::Bounds<blender::float3>> BKE_editmesh_cache_calc_minmax(
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const BMEditMesh &em, const blender::bke::EditMeshData &emd)
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{
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using namespace blender;
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BMesh *bm = em.bm;
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if (bm->totvert == 0) {
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return std::nullopt;
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}
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if (emd.vert_positions.is_empty()) {
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BMVert *eve;
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BMIter iter;
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float3 min(std::numeric_limits<float>::max());
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float3 max(std::numeric_limits<float>::lowest());
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BM_ITER_MESH (eve, &iter, bm, BM_VERTS_OF_MESH) {
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minmax_v3v3_v3(min, max, eve->co);
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}
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return Bounds<float3>{min, max};
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}
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return bounds::min_max(emd.vert_positions.as_span());
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}
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/** \} */
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