Bug in libpfdu mesher ?

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Lionel Maiaux (maiaux++at++mica.corys.fr)
Mon, 18 Nov 1996 12:08:42 +0100

Hi,

I discovered a strange piece of code in the "retessellate" fonction of the
mesher.
To determine if vertices can be swaped, there is a test on PER_VERTEX colors
...

    /* Make sure vertex colors are the same */
    if (CBind == PFGS_PER_VERTEX &&
        (!PFALMOST_EQUAL_VEC4(Colors[Cindex[vi]],
                     Colors[Cindex[vj]], SORTOF) ||
         !PFALMOST_EQUAL_VEC4(Colors[Cindex[vi]],
                     Colors[Cindex[(vj+1) % 3]], SORTOF)))
        return;

... but :

1) vi and vj are indexes in coordinate array (Coords), so I don't understand
how they can be used in Cindex array,

2) vi and vj are supposed to represent no common vertices but I think common
vertices should be first tested (in fact, all 3 vertices of the 2 triangles
should have the same color or the swap could be visible).

Thanks in advance to the Performer team for taking the time to confirm this
bug.

Regards.
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