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Finding outward face normals

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Hello,all! I have a surface described by triangular mesh when I get the list of vertixes belonging to each triangle and the list of triangles. I want to find outward normals for every triangle, however, I don't know whether the order of the vertixes obeys the right hand rule. What I do succeed to do is to define a correct normal for one triangleor define a point inside or outside the surface (if it is closed) or a point at the visible side (if the surface is not closed). Is there a way to define all the normals as they should be? Thanks, mshr25

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