What decides the render-order when same Render Queue and ZTest Always

Unity Engine
1

I have one shader in the overlay render queue - and ZTest Always is set (its a gizmo / handle the user can drag around)

  • now i use the same shader on a few elements of this handle (different coloured materials and such)
  • when they use the same shader and same queue, with ZTest Always: what decides the actual rendering order?
  • right now they are all in the overlay+1 queue, and draw nicely over everything else
  • but despite their ZTest Always state, they seem to respect each other (means they draw themselves as if they had a Ztest). So it works for now, just i don’t know why…
  • my first guess was the order in the scene hierarchy, but that is not the case

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2

In 3D space, if an object is closer to the camera, it gets rendered above the others. Test this in 2D and put the objects inside each other, you should see Z-fighting which is common in 2D unless you use layers.