The TextMesh always make the canvas has some additional shader channel.

Is it necessary for theres shader channel?
It will make the other component, include the image, rawimages, plain text has the additional shader channel too. Is there any way to reduce it?

 

Having additional channels selected on a Canvas doesn't have any material impact on perform. So for instance, a component like a UI.Image which doesn't use UV2 would not really be impacted by these extra channels since it does not push data through them.

It does require the given Canvas to allocate buffers to accommodate those additional channels but that too should have no real material affect.

 

@Stephan_B It would be better then to either 1) not include unneeded channels or 2) not give us a warning about how we should remove them and then forcibly re-add them every time we play the scene. @watsonsong had a legitimate concern.

Both Target Display and Additional Shader Channels are also completely ignored in the documentation: https://docs.unity3d.com/2018.4/Documentation/Manual/class-Canvas.html

 

Removing this warning would be best,

 

Still not solved in Unity 2021.3.x.

 

This is not a bug. This is certainly an annoying warning which should be removed.

 

A warning with a suggestion that cannot be removed or obeyed sure feels like a bug.

 

I concur and do hope that we remove this annoying warning at some point.

P.S. As I have said before, this warning made sense when considering UGUI in isolation but not when other tools like TMP or potential asset store packages might be using the framework with their own custom geometry which UGUI did not anticipated when this warning was initially added.

 

It's still there. I almost deleted these channels because of this warning.