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Thread: Modification of the orientation of normal vector

  1. #1
    iggBerlin
    Guest

    Modification of the orientation of normal vector

    I think I understand how to implement the code for NORMAL VECTOR inside the tag <triangle>.

    However, if I modify the orientation of normal vector for one or more triangles I don't observe any change when I visualize my model inside the Collada viewer (I use Skechtup 7 Pro and Google Earth).

    Why? Is the normal vector use to identify the face culling?

    Instead, the inversion of triangle winding order works properly and produces the inversion of the front-side with back-side. Any help? Thank you.

  2. #2
    Senior Member
    Join Date
    Aug 2004
    Location
    California
    Posts
    771

    Re: Modification of the orientation of normal vector

    What viewer are you using?

    COLLADA stores vertex normals. An application can choose to use them or not. It sounds like the viewer you are using is ignoring the stored normals and computing normals.

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