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Multiple lighting model in one shader with mask

Discussion in 'Shaders' started by Charles_Gams, Apr 24, 2014.

  1. Charles_Gams

    Charles_Gams

    Joined:
    Feb 23, 2013
    Posts:
    31
    Hi

    I know its possible to have multiple lighting models in a shader but for example say you have BlinnPhong and Lambert and you want only some parts of a model to have a BlinnPhong lighting and others a Lambert (basically masking). How would this be done I've tried out things with no success so far
     
    Charles_Gams, Apr 24, 2014
    #1

  2. Daniel_Brauer

    Daniel_Brauer

    Unity Technologies

    Joined:
    Aug 11, 2006
    Posts:
    3,355
    Is there a reason you need to do this using a shader rather than by splitting up the model?

    Moreover, Lambert is a strict subset of Blinn-Phong. Any area of BlinnPhong with a black specular colour will behave the same as Lambert.
     
    Daniel_Brauer, Apr 24, 2014
    #2

  3. Charles_Gams

    Charles_Gams

    Joined:
    Feb 23, 2013
    Posts:
    31

    Yeah cause I've built a shader that can blend between two or three lighting models and I would want to mask parts of a model rather than splitting it into pieces(model)
     
    Charles_Gams, Apr 25, 2014
    #3

  4. Daniel_Brauer

    Daniel_Brauer

    Unity Technologies

    Joined:
    Aug 11, 2006
    Posts:
    3,355
    If you've already got a shader that blends between lighting models, the masking part is easy: simply read a mask texture to get your blending parameters rather than the constants your are (presumably) using now.
     
    Daniel_Brauer, Apr 25, 2014
    #4