how to make depth layer mapping = world work

[rock117]

hi Team, sorry, this may not an issue but a Q&A, but since there no Q&A section in the project, so I have to riase an issue here instead.

I am doing a test with the Depth layer, when set mapping to world, it seems that only near/far works, when I changed the position of the mesh, its appearance doesn't changed.

Below is my code
https://github.com/rock117/my-lamina-test/blob/main/src/App.vue

As the document listed and the source code, if my undestanding is correct only the mesh's position effect the material render

 case 'world':
        return `length(v_${uuid}_position - vec3(0.))`

when changed the mesh's position, its appearance should update.

But what ever I changed the position, the appearance still not update.
do I need to set any other settings(except near,far) or invoke any Three/Lamina API to make the material update? thanks.