[Gmsh] Possible Bug with Orientations

[Archi Forshop]

Hi,

I am having problems making meshed surface elements
oriented the same way as the physical surface entity
they belong to. I'm attaching below a simple script
that shows it clearly when both Geometry-Normals and
Surface-Normals are displayed at the same time.
Different mesh algorithms produce sometimes different
orientations, all basically wrong ones.

Maybe I'm doing something wrong myself.

Archi

P.S. I'm using the latest version gmsh-1.44.0

---start cut here ---

/*********************************************************************

 *
 *  brick.geo
 *
*********************************************************************/

lc = 1.0;

xa    = 3.0;
yb    = 1.0;
zc    = 2.0;

p1 = newp; Point(p1) = {0.0, 0.0, 0.0, lc};
p2 = newp; Point(p2) = {xa , 0.0, 0.0, lc};
p3 = newp; Point(p3) = {xa , yb , 0.0, lc};
p4 = newp; Point(p4) = {0.0, yb , 0.0, lc};
p5 = newp; Point(p5) = {0.0, 0.0, zc , lc};
p6 = newp; Point(p6) = {xa , 0.0, zc , lc};
p7 = newp; Point(p7) = {xa , yb , zc , lc};
p8 = newp; Point(p8) = {0.0, yb , zc , lc};

l1  = newreg; Line(l1)  = {p1,p2};
l2  = newreg; Line(l2)  = {p2,p3};
l3  = newreg; Line(l3)  = {p3,p4};
l4  = newreg; Line(l4)  = {p4,p1};
l5  = newreg; Line(l5)  = {p1,p5};
l6  = newreg; Line(l6)  = {p2,p6};
l7  = newreg; Line(l7)  = {p3,p7};
l8  = newreg; Line(l8)  = {p4,p8};
l9  = newreg; Line(l9)  = {p5,p6};
l10 = newreg; Line(l10) = {p6,p7};
l11 = newreg; Line(l11) = {p7,p8};
l12 = newreg; Line(l12) = {p8,p5};

llp1 = newreg; Line Loop(llp1) = {l1,l6,-l9,-l5};
llp2 = newreg; Line Loop(llp2) = {l2,l7,-l10,-l6};
llp3 = newreg; Line Loop(llp3) = {l3,l8,-l11,-l7};
llp4 = newreg; Line Loop(llp4) = {l4,l5,-l12,-l8};
llp5 = newreg; Line Loop(llp5) = {l9,l10,l11,l12};
llp6 = newreg; Line Loop(llp6) = {-l1,-l4,-l3,-l2};

s1 = newreg; Plane Surface(s1)={llp1};
s2 = newreg; Plane Surface(s2)={llp2};
s3 = newreg; Plane Surface(s3)={llp3};
s4 = newreg; Plane Surface(s4)={llp4};
s5 = newreg; Plane Surface(s5)={llp5};
s6 = newreg; Plane Surface(s6)={llp6};

slp1 = newreg; Surface Loop(slp1) =
{s1,s2,s3,s4,s5,s6};

surfPhys = newreg; Physical Surface(surfPhys) =
{s1,s2,s3,s4,s5,s6};
Printf("surfPhys# = %g",surfPhys);

vbrick = newreg; Complex Volume(vbrick) = {slp1};

brick = newreg; Physical Volume(brick) = {vbrick};

---end cut here ---


__________________________________
Do you Yahoo!?
The New Yahoo! Search - Faster. Easier. Bingo.
http://search.yahoo.com