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Bevel: partial fix for distortion (bug 33280).

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Sometimes it is impossible to have same offset from
both edges that are on angled faces. The fix here
at least doesn't distort the non-beveled part of the
model, and looks much better than before on bug
example, but is still not perfect.
This commit is contained in:
Howard Trickey 2012-11-29 13:54:39 +00:00
parent 4e981dc566
commit fb27a69124
1 changed files with 27 additions and 10 deletions
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37
source/blender/bmesh/tools/bmesh_bevel.c
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@ -365,13 +365,19 @@ static void offset_meet(EdgeHalf *e1, EdgeHalf *e2, BMVert *v, BMFace *f,
}
/* Like offset_meet, but here f1 and f2 must not be NULL and give the
* planes in which to run the offset lines. They may not meet exactly,
* but the line intersection routine will find the closest approach point. */
static void offset_in_two_planes(EdgeHalf *e1, EdgeHalf *e2, BMVert *v,
BMFace *f1, BMFace *f2, float meetco[3])
* planes in which to run the offset lines.
* They may not meet exactly: the offsets for the edges may be different
* or both the planes and the lines may be angled so that they can't meet.
* In that case, pick a close point on emid, which should be the dividing
* edge between the two planes.
* TODO: should have a global 'offset consistency' prepass to adjust offset
* widths so that all edges have the same offset at both ends. */
static void offset_in_two_planes(EdgeHalf *e1, EdgeHalf *e2, EdgeHalf *emid,
BMVert *v, BMFace *f1, BMFace *f2, float meetco[3])
{
float dir1[3], dir2[3], norm_perp1[3], norm_perp2[3],
off1a[3], off1b[3], off2a[3], off2b[3], isect2[3];
off1a[3], off1b[3], off2a[3], off2b[3], isect2[3], co[3];
int iret;
BLI_assert(f1 != NULL && f2 != NULL);
@ -397,9 +403,21 @@ static void offset_in_two_planes(EdgeHalf *e1, EdgeHalf *e2, BMVert *v,
/* lines are parallel; off1a is a good meet point */
copy_v3_v3(meetco, off1a);
}
else if (!isect_line_line_v3(off1a, off1b, off2a, off2b, meetco, isect2)) {
/* another test says they are parallel */
copy_v3_v3(meetco, off1a);
else {
iret =isect_line_line_v3(off1a, off1b, off2a, off2b, meetco, isect2);
if (iret == 0) {
/* lines colinear: another test says they are parallel. so shouldn't happen */
copy_v3_v3(meetco, off1a);
}
else if (iret == 2) {
/* lines are not coplanar; meetco and isect2 are nearest to first and second lines */
if (len_v3v3(meetco, isect2) > 100.0f * (float)BEVEL_EPSILON) {
/* offset lines don't meet: project average onto emid; this is not ideal (see TODO above) */
mid_v3_v3v3(co, meetco, isect2);
closest_to_line_v3(meetco, co, v->co, BM_edge_other_vert(emid->e, v)->co);
}
}
/* else iret == 1 and the lines are coplanar so meetco has the intersection */
}
}
@ -753,8 +771,7 @@ static void build_boundary(MemArena *mem_arena, BevVert *bv)
if (e->prev->prev->is_bev) {
BLI_assert(e->prev->prev != e); /* see: edgecount 2, selcount 1 case */
/* find meet point between e->prev->prev and e and attach e->prev there */
/* TODO: fix case when one or both faces in following are NULL */
offset_in_two_planes(e->prev->prev, e, bv->v,
offset_in_two_planes(e->prev->prev, e, e->prev, bv->v,
e->prev->prev->fnext, e->fprev, co);
v = add_new_bound_vert(mem_arena, vm, co);
v->efirst = e->prev->prev;