• Unity

  • Material override and UI masks

    inglés

Hi,

While investigating a bug in our project, our programmer found something that other people might find interesting. So we decided to share it here:

In our project, we have had to use the override material property provided by the SkeletonGraphic. However in doing so, we saw that UI Masks would no longer work on our UI characters with material override.

Digging into the code, we saw that using the override material, the code will go a whole other way and only provide the brut material to the submesh's CanvasRenderer instead of the default property "materialForRendering", which applies all found IMaterialModifier in the GO. Among them, there is MaskableGraphic, which is the key component that makes the Mask possible.

We don't know if such behavior was intended in the first place. So we added a small line, using submeshGraphics, to get the modified material override before sending it to the canvas renderer, this "fix" is most simplistic however because it will not take into account other IMaterialModifier that may be there.

But nevertheless it solved our Mask issue and though we would share it here, as it may (or may not) solve a discrepency in the SkeletonGraphic.

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Thanks for sharing your insights and for reporting this issue. Unfortunately I'm not sure I fully understand your problem scenario though. Could you perhaps send us a minimal Unity project that still shows the problem as a zip package to contact@esotericsoftware.com (briefly mentioning this forum thread URL so that we know the context)? Then we can have a look at it and provide an official bugfix.

5 días más tarde

If you allow me, I'll try to reformulate the issue before sending a unity package.
In our project we have to use another shader than the one provided by spine to display our spine assets. (All in 1 sprite Shader from the unity store).
We use the override material property provided by spine on this shader. In theses conditions, if we put a spine asset in a Unity UI Canvas, under a Unity mask, the mask will not work. The spine asset will ignore the mask.

I guess you could repro the issue easily using the following steps:

  1. Import a spine skeleton in a unity project
  2. Change the shader of of your spine asset material
  3. Use the override material property on this material
  4. Import the spine skeleton in a canvas, under a gameobject with a mask
  5. Observe that the spine object is ignoring the UI mask

Thanks, the bit of code that I posted is solving the issue (the line 745 in red brackets).
However we are not sure that it's the best way possible. Feel free to use it, if it makes sense.

A new unitypackage has just been published containing the bugfix. It turned out that the same line was also missing in another code branch, blend mode materials would otherwise ignore masks too.

The updated unitypackage is available for download here as usual:
Spine Unity Download
Thanks again very much for reporting and providing the bugfix code up front!

Thanks. We are glad it helped 😉