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/* SPDX-License-Identifier: GPL-2.0-or-later */
#pragma once
/** \file
* \ingroup bmesh
*/
#include "bmesh_class.h"
struct BMeshNormalsUpdate_Params {
/**
* When calculating tessellation as well as normals, tessellate & calculate face normals
* for improved performance. See #BMeshCalcTessellation_Params
*/
bool face_normals;
};
/**
* \brief BMesh Compute Normals
*
* Updates the normals of a mesh.
*/
void BM_mesh_normals_update_ex(BMesh *bm, const struct BMeshNormalsUpdate_Params *param);
void BM_mesh_normals_update(BMesh *bm);
/**
* A version of #BM_mesh_normals_update that updates a subset of geometry,
* used to avoid the overhead of updating everything.
*/
void BM_mesh_normals_update_with_partial_ex(BMesh *bm,
const struct BMPartialUpdate *bmpinfo,
const struct BMeshNormalsUpdate_Params *param);
void BM_mesh_normals_update_with_partial(BMesh *bm, const struct BMPartialUpdate *bmpinfo);
/**
* \brief BMesh Compute Normals from/to external data.
*
* Computes the vertex normals of a mesh into vnos,
* using given vertex coordinates (vcos) and polygon normals (fnos).
*/
void BM_verts_calc_normal_vcos(BMesh *bm,
const float (*fnos)[3],
const float (*vcos)[3],
float (*vnos)[3]);
/**
* \brief BMesh Compute Loop Normals from/to external data.
*
* Compute split normals, i.e. vertex normals associated with each poly (hence 'loop normals').
* Useful to materialize sharp edges (or non-smooth faces) without actually modifying the geometry
* (splitting edges).
*/
void BM_loops_calc_normal_vcos(BMesh *bm,
const float (*vcos)[3],
const float (*vnos)[3],
const float (*fnos)[3],
bool use_split_normals,
float split_angle,
float (*r_lnos)[3],
struct MLoopNorSpaceArray *r_lnors_spacearr,
short (*clnors_data)[2],
int cd_loop_clnors_offset,
bool do_rebuild);
/**
* Check whether given loop is part of an unknown-so-far cyclic smooth fan, or not.
* Needed because cyclic smooth fans have no obvious 'entry point',
* and yet we need to walk them once, and only once.
*/
bool BM_loop_check_cyclic_smooth_fan(BMLoop *l_curr);
void BM_lnorspacearr_store(BMesh *bm, float (*r_lnors)[3]);
void BM_lnorspace_invalidate(BMesh *bm, bool do_invalidate_all);
void BM_lnorspace_rebuild(BMesh *bm, bool preserve_clnor);
/**
* \warning This function sets #BM_ELEM_TAG on loops & edges via #bm_mesh_loops_calc_normals,
* take care to run this before setting up tags.
*/
void BM_lnorspace_update(BMesh *bm);
void BM_normals_loops_edges_tag(BMesh *bm, bool do_edges);
#ifndef NDEBUG
void BM_lnorspace_err(BMesh *bm);
#endif
/* Loop Generics */
struct BMLoopNorEditDataArray *BM_loop_normal_editdata_array_init(BMesh *bm,
bool do_all_loops_of_vert);
void BM_loop_normal_editdata_array_free(struct BMLoopNorEditDataArray *lnors_ed_arr);
/**
* \warning This function sets #BM_ELEM_TAG on loops & edges via #bm_mesh_loops_calc_normals,
* take care to run this before setting up tags.
*/
bool BM_custom_loop_normals_to_vector_layer(struct BMesh *bm);
void BM_custom_loop_normals_from_vector_layer(struct BMesh *bm, bool add_sharp_edges);
/**
* Define sharp edges as needed to mimic 'autosmooth' from angle threshold.
*
* Used when defining an empty custom loop normals data layer,
* to keep same shading as with auto-smooth!
*/
void BM_edges_sharp_from_angle_set(BMesh *bm, float split_angle);
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