Draw child above parent regardless of anything in 2D game

Unity Engine
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1

I Have 2 types of objects that user can spawn and place in world

  1. Window
  2. Block

blocks are basic elements and windows act as containers for blocks so user can group together similar blocks

how can i do such that block outside window appear below any window and blocks that are part of window (placed inside window) appear above window.

2

Three (3) primary ways that Unity draws / stacks / sorts / layers / overlays stuff:

In short, as far as the Standard Rendering Pipeline,

  1. The default 3D Renderers draw stuff according to Z depth - distance from camera.

  2. SpriteRenderers draw according to their Sorting Layer and Sorting Depth properties

  3. UI Canvas Renderers draw in linear transform sequence, like a stack of papers

If you find that you need to mix and match items using these different ways of rendering, and have them appear in ways they are not initially designed for, you need to:

  • identify what you are using
  • search online for the combination of things you are doing and how to to achieve what you want.

There may be more than one solution to try.

For instance, you may even use multiple co-located cameras (along with different Layers and LayerMasks drawn to different-depth Cameras) to more-explicitly control apparent draw ordering.

Additional reading in the official docs:

And SortingGroups can also be extremely helpful in certain circumstances:

Other rendering pipelines may have other ways of layering (HDRP and URP). Go see the latest docs for details.

There’s lots of third party open source packages available as well, such as this: