167 lines
4.7 KiB
C
167 lines
4.7 KiB
C
/*
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* ***** BEGIN GPL LICENSE BLOCK *****
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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*
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* The Original Code is Copyright (C) 2005 by the Blender Foundation.
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* All rights reserved.
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*
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* Contributor(s): Daniel Dunbar
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* Ton Roosendaal,
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* Ben Batt,
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* Brecht Van Lommel,
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* Campbell Barton
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*
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* ***** END GPL LICENSE BLOCK *****
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*
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*/
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/** \file blender/modifiers/intern/MOD_edgesplit.c
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* \ingroup modifiers
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*
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* EdgeSplit modifier
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*
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* Splits edges in the mesh according to sharpness flag
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* or edge angle (can be used to achieve autosmoothing)
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*/
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#include "BLI_utildefines.h"
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#include "BLI_math.h"
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#include "BKE_cdderivedmesh.h"
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#include "BKE_modifier.h"
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#include "bmesh.h"
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#include "bmesh_tools.h"
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#include "DNA_object_types.h"
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static DerivedMesh *doEdgeSplit(DerivedMesh *dm, EdgeSplitModifierData *emd)
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{
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DerivedMesh *result;
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BMesh *bm;
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BMIter iter;
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BMEdge *e;
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float threshold = cosf(emd->split_angle + 0.000000175f);
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const bool calc_face_normals = (emd->flags & MOD_EDGESPLIT_FROMANGLE) != 0;
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bm = DM_to_bmesh(dm, calc_face_normals);
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if (emd->flags & MOD_EDGESPLIT_FROMANGLE) {
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BM_ITER_MESH (e, &iter, bm, BM_EDGES_OF_MESH) {
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/* check for 1 edge having 2 face users */
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BMLoop *l1, *l2;
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if ((l1 = e->l) &&
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(l2 = e->l->radial_next) != l1)
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{
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if (/* 3+ faces on this edge, always split */
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UNLIKELY(l1 != l2->radial_next) ||
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/* 2 face edge - check angle*/
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(dot_v3v3(l1->f->no, l2->f->no) < threshold))
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{
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BM_elem_flag_enable(e, BM_ELEM_TAG);
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}
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}
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}
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}
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if (emd->flags & MOD_EDGESPLIT_FROMFLAG) {
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BM_ITER_MESH (e, &iter, bm, BM_EDGES_OF_MESH) {
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/* check for 2 or more edge users */
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if ((e->l) &&
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(e->l->next != e->l))
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{
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if (!BM_elem_flag_test(e, BM_ELEM_SMOOTH)) {
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BM_elem_flag_enable(e, BM_ELEM_TAG);
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}
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}
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}
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}
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BM_mesh_edgesplit(bm, false, true, false);
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/* BM_mesh_validate(bm); */ /* for troubleshooting */
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result = CDDM_from_bmesh(bm, true);
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BM_mesh_free(bm);
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result->dirty |= DM_DIRTY_NORMALS;
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return result;
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}
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static void initData(ModifierData *md)
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{
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EdgeSplitModifierData *emd = (EdgeSplitModifierData *) md;
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/* default to 30-degree split angle, sharpness from both angle & flag */
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emd->split_angle = DEG2RADF(30.0f);
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emd->flags = MOD_EDGESPLIT_FROMANGLE | MOD_EDGESPLIT_FROMFLAG;
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}
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static void copyData(ModifierData *md, ModifierData *target)
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{
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#if 0
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EdgeSplitModifierData *emd = (EdgeSplitModifierData *) md;
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EdgeSplitModifierData *temd = (EdgeSplitModifierData *) target;
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#endif
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modifier_copyData_generic(md, target);
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}
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static DerivedMesh *applyModifier(ModifierData *md, Object *UNUSED(ob), DerivedMesh *dm,
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ModifierApplyFlag UNUSED(flag))
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{
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DerivedMesh *result;
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EdgeSplitModifierData *emd = (EdgeSplitModifierData *) md;
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if (!(emd->flags & (MOD_EDGESPLIT_FROMANGLE | MOD_EDGESPLIT_FROMFLAG)))
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return dm;
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result = doEdgeSplit(dm, emd);
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return result;
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}
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ModifierTypeInfo modifierType_EdgeSplit = {
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/* name */ "EdgeSplit",
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/* structName */ "EdgeSplitModifierData",
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/* structSize */ sizeof(EdgeSplitModifierData),
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/* type */ eModifierTypeType_Constructive,
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/* flags */ eModifierTypeFlag_AcceptsMesh |
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eModifierTypeFlag_AcceptsCVs |
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eModifierTypeFlag_SupportsMapping |
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eModifierTypeFlag_SupportsEditmode |
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eModifierTypeFlag_EnableInEditmode,
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/* copyData */ copyData,
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/* deformVerts */ NULL,
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/* deformMatrices */ NULL,
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/* deformVertsEM */ NULL,
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/* deformMatricesEM */ NULL,
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/* applyModifier */ applyModifier,
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/* applyModifierEM */ NULL,
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/* initData */ initData,
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/* requiredDataMask */ NULL,
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/* freeData */ NULL,
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/* isDisabled */ NULL,
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/* updateDepsgraph */ NULL,
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/* dependsOnTime */ NULL,
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/* dependsOnNormals */ NULL,
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/* foreachObjectLink */ NULL,
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/* foreachIDLink */ NULL,
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/* foreachTexLink */ NULL,
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};
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