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BMesh: Add BM_face_calc_area_uv

This commit is contained in:
Clément Foucault 2019-01-09 22:09:27 +01:00
parent b98e6743dc
commit 74260a2b6d
2 changed files with 21 additions and 0 deletions
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20
source/blender/bmesh/intern/bmesh_polygon.c
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@ -30,6 +30,7 @@
#include "DNA_listBase.h"
#include "DNA_modifier_types.h"
#include "DNA_meshdata_types.h"
#include "MEM_guardedalloc.h"
@ -261,6 +262,25 @@ float BM_face_calc_area_with_mat3(const BMFace *f, const float mat3[3][3])
return len_v3(n) * 0.5f;
}
/**
* get the area of UV face
*/
float BM_face_calc_area_uv(const BMFace *f, int cd_loop_uv_offset)
{
/* inline 'area_poly_v2' logic, avoid creating a temp array */
const BMLoop *l_iter, *l_first;
l_iter = l_first = BM_FACE_FIRST_LOOP(f);
/* The Trapezium Area Rule */
float cross = 0.0f;
do {
const MLoopUV *luv = BM_ELEM_CD_GET_VOID_P(l_iter, cd_loop_uv_offset);
const MLoopUV *luv_next = BM_ELEM_CD_GET_VOID_P(l_iter->next, cd_loop_uv_offset);
cross += (luv_next->uv[0] - luv->uv[0]) * (luv_next->uv[1] + luv->uv[1]);
} while ((l_iter = l_iter->next) != l_first);
return fabsf(cross * 0.5f);
}
/**
* compute the perimeter of an ngon
*/

1
source/blender/bmesh/intern/bmesh_polygon.h
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@ -45,6 +45,7 @@ float BM_face_calc_normal_vcos(
float BM_face_calc_normal_subset(const BMLoop *l_first, const BMLoop *l_last, float r_no[3]) ATTR_NONNULL();
float BM_face_calc_area(const BMFace *f) ATTR_WARN_UNUSED_RESULT ATTR_NONNULL();
float BM_face_calc_area_with_mat3(const BMFace *f, const float mat3[3][3]) ATTR_WARN_UNUSED_RESULT ATTR_NONNULL();
float BM_face_calc_area_uv(const BMFace *f, int cd_loop_uv_offset) ATTR_WARN_UNUSED_RESULT ATTR_NONNULL();
float BM_face_calc_perimeter(const BMFace *f) ATTR_WARN_UNUSED_RESULT ATTR_NONNULL();
float BM_face_calc_perimeter_with_mat3(const BMFace *f, const float mat3[3][3]) ATTR_WARN_UNUSED_RESULT ATTR_NONNULL();
void BM_face_calc_tangent_edge(const BMFace *f, float r_plane[3]) ATTR_NONNULL();