move object into upper or below layer

[CaRRotOne]

Dear all:
I know using +/- or "To background"/"To Foreground" can move object to the bottom layer or top layer. If the top z_order layer is 6th, the current z_order of object is 3th, how could I do to move the object from 3th z_order to 4th z_order?

[bsekachev]

Hi, no way. You can change z_order only to the toppest + 1, to the lowest - 1 levels.

[CaRRotOne]

Hi, no way. You can change z_order only to the toppest + 1, to the lowest - 1 levels.

I think design in this way must have a reason. could you explain to me? appreciate.
In my opinion, the method mentioned in my question could be more efficient in some scenarios, the annotator with less experience could easily make annotation if they could edit the z_order layer

[bsekachev]

The main reason I would say is do not overcomplicate. In the most of cases these two keys are enough (at least I do not remember others such requests for years).
Just annotate image from "furthest" to "closest" objects and you do not need to change zOrder postfact.
If you realized, that the layer of an object is incorrect, you can up or down the object. In case of several layers usually it is very simple.

But I agree, that in case of huge number of layers with a lot of intersections you might need to up/down different objects lots of times. And I wouldn't say that up/down 1 level solves the problem, because you anyway need to up/down the object several times in general. The workaround here is to copy the object, go to necessary layer and past it there.

[nmanovic]

@CaRRotOne , @bsekachev , probably it is a good idea to look at different approach and see how to improve UX of the feature.

[CaRRotOne]

@bsekachev thanks for the explanation. I had discussed with annotators with rich experience, they aggre with your opinion.For beginners, I still think 'up/down 1 level' function is more friendly. @nmanovic we will use cvat frequently these days，I will post some special case if found, I know it is easy to implement technically, but for UX designer, maybe it is not a little change.

[zwfcrazy]

I also need an easier way to change the layer of an object, because I want to label the relationship such as A is occluded by B and B is occluded by C. The current UX allows us to create an object in a specific layer but it is difficult to change the layer of an existing object, which is, for example, created by auto-annotation.
My requirement can also be achieved by adding an extra attribute to an object. So maybe you can add the function of adding arbitrary user-defined attribute to an object.

[xjf17]

I also need to change the z-order manually. I am working on a building material segmentation dataset. I often have dozens of layers. If I labeled one thing in the wrong layer, I would spend a long time to correct it. If you can add this function, I will be more than delighted.