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Fixed in 2019.1



Found in



Issue ID




Canvas Group children with Canvas component are faded when changing Alpha parameter in the Canvas Group



How to reproduce:
1. Open the attached project
2. In the Hierarchy window expand Canvas and select Canvas group
3. Go to Inspector window -> Canvas Group -> Alpha
4. Decrease Alpha from 1 to 0.5 and then to 0 to see that the Image with Canvas is not fading

Expected: Canvas Group children with Canvas component are faded
Actual: Canvas Group children with Canvas component aren't faded

Reproducable with: 2018.3.0a11, 2018.3.0b5, 2019.1.0a3
Not reproducable with: 2017.4.12f1, 2018.1.9f2, 2018.2.11f1, 2018.0a10

Comments (5)

  1. 3ecd3cdb044819ccf5b5028cbf713c94?d=mm


    Sep 21, 2019 07:16

    Thank you so much for sharing this article about the canvas group children. I wondered why the canvas component was faded when the alpha parameter in the canvas group was changed. Your article was really an informative one. Keep sharing more.

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    Jul 22, 2019 07:23

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    Mar 28, 2019 09:18

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  4. 40a282f8cb084da5727086f53b400347?d=mm


    Mar 06, 2019 04:18

    Yes, please backport this to 2018.3.X.
    I wanted to upgrade to 2018.3.7 following the news of the remote code execution security warning, but this bug is just gonna break so much of our UI.

  5. 9c7dc0508716142543de1cbf4102d7c3?d=mm


    Feb 25, 2019 02:42

    Come on, Unity. Please backporting this to Unity2018.3.X. If not, so many projects could not be use Unity2018.3.X.

    This issue is a very serious and used common case. For example, split canvas and simply control show/hide. Strategy fo split canvas also useful render together Particle System, SpriteRenderer. So so many common logic have to be change, there are not a simply solver.

    I have a some dirty solving way that link CanvasGroup like chain(What the!), and use it before we decide to upgrade Unity 2019.X(of course, I thought we can not upgrade before be regular stage). But in this case also have a lot of problem in case by case.

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