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Thread: Mistake in COLLADA 1.5 specification?

  1. #1
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    Mistake in COLLADA 1.5 specification?

    I'm not sure if this is the place to report a possible error in the specification; if not, perhaps someone can direct me to the correct place.

    Page 103 in the specification says this about orthographic camera parameters xmag and ymag:

    The X and Y magnifications are simple scale factors, applied to the X and Y components of the orthographic viewport. As such, if your default orthographic viewport is [[-1,1],[-1,1]] as in OpenGL and DirectX, your COLLADA orthographic viewport becomes [[-xmag,xmag],[-ymag,ymag]]. This gives an orthographic width of xmag/2 and an orthographic height of ymag/2.
    I believe the last sentence should say:

    This gives an orthographic width of xmag*2 and an orthographic height of ymag*2.
    That is, assuming that "orthographic width" is the same thing as viewport (frustum) width.

  2. #2
    Junior Member
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    Re: Mistake in COLLADA 1.5 specification?

    Indeed that looks to be a bug in the SPEC, and I just saw that was probably inherited from COLLADA 1.4.1 that has the very same issue.

    I filed: http://www.khronos.org/bugzilla/show_bug.cgi?id=707

  3. #3
    Junior Member
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    Re: Mistake in COLLADA 1.5 specification?

    Thanks fabrice

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