[Gmsh] a bug in the solid shading

[walter steffe]

System Linux Suse 8.2.
Gmsh version:  gmsh-1.45.1-1.i386.rpm
The first triangle in the surface mesh of the object described in the annexed 
file is always black.

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Point(1) = {0, 0, 0, 0.2};
Point(2) = {2, 0, 0, 0.2};
Point(3) = {2, 1, 0, 0.2};
Point(4) = {0, 1, 0, 0.2};
Point(5) = {0, 0, 1, 0.2};
Point(6) = {2, 0, 1, 0.2};
Point(7) = {2, 1, 1, 0.2};
Point(8) = {0, 1, 1, 0.2};
Line (1) = {1, 2};
Line (2) = {2, 3};
Line (3) = {3, 4};
Line (4) = {4, 1};
Line (5) = {5, 6};
Line (6) = {6, 7};
Line (7) = {7, 8};
Line (8) = {8, 5};
Line (9) = {2, 6};
Line (10) = {3, 7};
Line (11) = {4, 8};
Line (12) = {1, 5};
Line Loop (1000001) = {-8, -11, 4, 12};
Plane Surface (1) = {1000001};
Line Loop (1000002) = {-6, -9, 2, 10};
Plane Surface (2) = {1000002};
Line Loop (1000003) = {-5, -12, 1, 9};
Plane Surface (3) = {1000003};
Line Loop (1000004) = {-7, -10, 3, 11};
Plane Surface (4) = {1000004};
Line Loop (1000005) = {-4, -3, -2, -1};
Plane Surface (5) = {1000005};
Line Loop (1000006) = {5, 6, 7, 8};
Plane Surface (6) = {1000006};