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Collada : geometry problem ?

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Hi, I'm trying to load a Collada file, the BikeFromXSI.dae file from : http://collada.org/owl/browse.php?sess=0&parent=123&expand=1&order=name&curview=0&sortname=ASC But I got a problem with the geometry when I try to calculate the normal, because I have 2 identical points coordinates for the same polygon : The geometry name is : "geometries_7" Polygon index : 1737 (index start at 0) in


at the 6948 (1737*4) index, I got the following vertices indexes : vertex indice = 828 vertex indice = 107 vertex indice = 802 vertex indice = 2070 And then the following vertices ... Here are the positions of the vertices : (-0,669677972793579, 0,797966003417969, 0,669677972793579) (-0,669677972793579, 0,797966003417969, 0,669677972793579) (-0,786494970321655, 0,797966003417969, 0,525873005390167) (-0,786494970321655, 0,797966003417969, 0,525873005390167) How it is possible to have several times the same coordinates for this polygon ? I really hope that someone will be able to help me. Thanks

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