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Write to an uniform in a surface shader

Discussion in 'Shaders' started by Barti, Jul 12, 2015.

  1. Barti

    Barti

    Joined:
    Dec 8, 2012
    Posts:
    5
    Hi!

    When I understood surface shaders right, then the lighting model is repeated for every light in the scene for every pixel.

    Is there a way to save a value that consists over this whole process?
    I need to save the attenuation from the first vertex light to mask the other lights.

    I tried to write it to an uniform variable but that does not work.

    Thank you for your help!
    Barti
     
    Barti, Jul 12, 2015
    #1

  2. Sparrowfc

    Sparrowfc

    Joined:
    Jan 31, 2013
    Posts:
    100
    use custom Lighting in surfshader will do. check the documentation for details.
     
    Sparrowfc, Jul 12, 2015
    #2

  3. Barti

    Barti

    Joined:
    Dec 8, 2012
    Posts:
    5
    I will try that but then I need to access the attenuation of all the lights in my lighting model. How can I do that, I did not find anything about that in the documentation.
     
    Barti, Jul 12, 2015
    #3