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Fix #32198: UV unwrap of half a UV sphere would not give a perfect sphere as a

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result. This wasn't really guaranteed anyway, because of numerical precision and
possible asymmetry in the triangulation, but we can do a bit better.

Now we bias the choice of how to split a quad into two triangles slightly
towards one of two possibilities, so that in case they are equal, floating point
errors do not decide the direction and symmetry is preserved.
This commit is contained in:
Brecht Van Lommel 2012-08-24 13:29:48 +00:00
parent aba2754a19
commit b30da4d58f
1 changed files with 5 additions and 1 deletions
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6
source/blender/editors/uvedit/uvedit_parametrizer.c
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@ -1135,7 +1135,11 @@ static PFace *p_face_add_fill(PChart *chart, PVert *v1, PVert *v2, PVert *v3)
static PBool p_quad_split_direction(PHandle *handle, float **co, PHashKey *vkeys)
{
float fac = len_v3v3(co[0], co[2]) - len_v3v3(co[1], co[3]);
/* slight bias to prefer one edge over the other in case they are equal, so
* that in symmetric models we choose the same split direction instead of
* depending on floating point errors to decide */
float bias = 1.0f + 1e-6f;
float fac = len_v3v3(co[0], co[2])*bias - len_v3v3(co[1], co[3]);
PBool dir = (fac <= 0.0f);
/* the face exists check is there because of a special case: when