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Thread: Directional Light

  1. #1
    Junior Member
    Join Date
    Sep 2010

    Directional Light

    What is correct or appropriate mapping of Directional Light parameters from COLLADA to OpenGL?
    I tested some sample files with Diffuse only (no ambient nor specular).
    It seems to me that this combination is good for most files.
    (I used Mac OSX Preview application as a reference)
    But it is too dark for "HatFromXSI.dae" from the model bank.
    I also tested with Diffuse and Specular (no ambient),
    but it is too bright for "BikeFromXSI.dae" .
    Are there some coefficients for each light source components (diffuse, specular and ambient) to implement COLLADA directional light?


  2. #2
    Senior Member
    Join Date
    Aug 2004

    Re: Directional Light

    See page 120 (5-80 light) of the 1.5 spec for information on the light types and their attenuation.

    Note that a directional light is not attenuated.

    Also be aware that applications may introduce their own light sources into their rendered scenes.

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