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Standard Shader Emission Value

Discussion in 'Unity 5 Pre-order Beta' started by nickw4rd, Nov 14, 2014.

  1. nickw4rd

    nickw4rd

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    Nov 14, 2014
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    How can I change the Emission value of a standard shader using c#?
     
    nickw4rd, Nov 14, 2014
    #1

  2. nickw4rd

    nickw4rd

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    Nov 14, 2014
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    Alright starting over. I have a model that came from studio max with a multi-sub object material. The model has 6 materials all together. How can I go in and change the Emission Color of one of those materials?

    I can do it with a model with a single material on it with:

    GetComponent<Renderer>().material.SetColor ("_EmissionColor", Color.black);

    Any help would be great. Thanks!
     
    Last edited: Nov 14, 2014
    nickw4rd, Nov 14, 2014
    #2

  3. one_one

    one_one

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    So where's the difficulty then?
     
    one_one, Nov 14, 2014
    #3

  4. noneee

    noneee

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    Nov 26, 2014
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    looks like no one can halp, so problem is actual for me too
     
    noneee, Feb 26, 2015
    #4

  5. Joachim_Ante

    Joachim_Ante

    Unity Technologies

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    Code (CSharp):
    1. // First you want to use the API with multiple materials
    2. // where 3 should be the index you want to use...
    3. var materials = GetComponent<Renderer>().materials;
    4. materials[3].SetColor ("_EmissionColor", Color.blue);
    5.  
    6. // Another thing to note is that Unity 5 uses the concept of shader keywords extensively.
    7. // So if your material is initially configured to be without emission, then in order to enable emission, you need to enable // the keyword.
    8. materials[3].EnableKeyword ("_EMISSION");
    9.  
    Oh and if you actually want to set it to black, then of course EnableKeyword is not necessary. In fact DisableKeyword in that case will make your shader run faster, because it will define out the math that deals with emissive surfaces, but of course the difference may or may not be huge depending on what you do, it may very well not be worth it to do that kind of optimization with switching enable / disable keywords.
     
    Joachim_Ante, Feb 26, 2015
    #5
    arufolo, anileapen05, melfless and 2 others like this.

  6. noneee

    noneee

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    Nov 26, 2014
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    i tried, but unfortunately nothing changed, looks like emission color do not work for unity's standard shader
     
    noneee, Feb 26, 2015
    #6

  7. Zomby138

    Zomby138

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    You might have to call DynamicGI.UpdateMaterials as well.
     
    Zomby138, Feb 26, 2015
    #7

  8. elbows

    elbows

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    You are giving up too easily. They work, I use them all over the place.
     
    elbows, Feb 26, 2015
    #8

  9. Joachim_Ante

    Joachim_Ante

    Unity Technologies

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    This is only necessary if you actually want to animate emissive lighting. Do you want to animate emissive lighting?
     
    Joachim_Ante, Feb 26, 2015
    #9

  10. Joachim_Ante

    Joachim_Ante

    Unity Technologies

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    As a starting point. I would suggest first trying it out in the material editor. So you can quickly see the results of changing the colors / textures assigned etc. This way you can prove to yourself or others that the rendering feature does indeed work.

    Once you know that the rendering actually works and the content looks as you expect it, then it makes sense to script it. As explained above.
     
    Joachim_Ante, Feb 26, 2015
    #10

  11. Gokcan

    Gokcan

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    Aug 15, 2013
    Posts:
    200
    The correct answer is
    Color finalValue=Color.White*someValue; // someValue adjust the scale of emission
    DynamicGI.SetEmissive(GetComponent<Renderer>(), finalValue); // Pass your objet's renderer which emissive material attached
    if you want to change emissive value at run time and affect GI. I have tested it and it works.
     
    Gokcan, Feb 26, 2015
    #11
    the_motionblur likes this.

  12. Gokcan

    Gokcan

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    Gokcan, Feb 26, 2015
    #12