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Fix for #1355

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Recalculate normals (mesh editmode) had some weak points, as demonstrated
in the bug report sample file. It appeared to be 2 aspects that could be
simply fixed:

- for calculation of the most outer face (to set normal outside) it used
  a manhattan distance. making it real distance helped quite some
- but most important: the routine only took triangles into account, which
  didn't work proper with very irregular quads, especially with non-flat
  quads. It now calculates both trias in a quad individually.
This commit is contained in:
Ton Roosendaal
2004-06-13 10:18:32 +00:00
parent 5d0818494d
commit 694ed26f8b
1 changed files with 24 additions and 6 deletions
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30
source/blender/src/editmesh.c
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@@ -1759,13 +1759,14 @@ void righthandfaces(int select) /* makes faces righthand turning */
EditEdge *eed, *ed1, *ed2, *ed3, *ed4;
EditVlak *evl, *startvl;
float maxx, nor[3], cent[3];
int totsel, found, foundone, direct, turn;
int totsel, found, foundone, direct, turn, tria_nr;
/* based at a select-connected to witness loose objects */
/* count per edge the amount of faces */
/* find the ultimate left, front, upper face */
/* find the ultimate left, front, upper face (not manhattan dist!!) */
/* also evaluate both triangle cases in quad, since these can be non-flat */
/* put normal to the outside, and set the first direction flags in edges */
@@ -1804,26 +1805,43 @@ void righthandfaces(int select) /* makes faces righthand turning */
/* from the outside to the inside */
evl= em->faces.first;
startvl= 0;
startvl= NULL;
maxx= -1.0e10;
tria_nr= 0;
while(evl) {
if(evl->f) {
CalcCent3f(cent, evl->v1->co, evl->v2->co, evl->v3->co);
cent[0]= fabs(cent[0])+fabs(cent[1])+fabs(cent[2]);
cent[0]= cent[0]*cent[0] + cent[1]*cent[1] + cent[2]*cent[2];
if(cent[0]>maxx) {
maxx= cent[0];
startvl= evl;
tria_nr= 0;
}
if(evl->v4) {
CalcCent3f(cent, evl->v1->co, evl->v3->co, evl->v4->co);
cent[0]= cent[0]*cent[0] + cent[1]*cent[1] + cent[2]*cent[2];
if(cent[0]>maxx) {
maxx= cent[0];
startvl= evl;
tria_nr= 1;
}
}
}
evl= evl->next;
}
/* set first face correct: calc normal */
CalcNormFloat(startvl->v1->co, startvl->v2->co, startvl->v3->co, nor);
CalcCent3f(cent, startvl->v1->co, startvl->v2->co, startvl->v3->co);
if(tria_nr==1) {
CalcNormFloat(startvl->v1->co, startvl->v3->co, startvl->v4->co, nor);
CalcCent3f(cent, startvl->v1->co, startvl->v3->co, startvl->v4->co);
} else {
CalcNormFloat(startvl->v1->co, startvl->v2->co, startvl->v3->co, nor);
CalcCent3f(cent, startvl->v1->co, startvl->v2->co, startvl->v3->co);
}
/* first normal is oriented this way or the other */
if(select) {
if(select==2) {