Sorting layers and order in Unity - Step-by-Step Execution

Concept Flow - Sorting layers and order

Assign Sorting Layer

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Assign Order in Layer

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Render Objects by Layer

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Within Layer, Render by Order

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Final Visual Stack on Screen

Objects get a sorting layer and an order number; Unity draws layers first, then orders within layers to decide what appears on top.

Execution Sample

Unity

sprite1.sortingLayerName = "Background";
sprite1.sortingOrder = 0;
sprite2.sortingLayerName = "Foreground";
sprite2.sortingOrder = 0;
sprite3.sortingLayerName = "Foreground";
sprite3.sortingOrder = 1;

Assign sorting layers and orders to three sprites to control which appears on top.

Execution Table

Step	Object	Sorting Layer	Order in Layer	Render Priority	Visual Result
1	sprite1	Background	0	Lowest	Drawn first, behind others
2	sprite2	Foreground	0	Middle	Drawn after Background, behind sprite3
3	sprite3	Foreground	1	Highest	Drawn last, appears on top
4	End	-	-	-	Rendering complete with sprite3 on top

💡 All objects assigned layers and orders; rendering done in layer then order sequence.

Variable Tracker

Object	Sorting Layer	Order in Layer
sprite1	Background	0
sprite2	Foreground	0
sprite3	Foreground	1

Key Moments - 2 Insights

Why does sprite3 appear on top even though sprite2 and sprite3 share the same layer?

Because sprite3 has a higher order in the same sorting layer (1 vs 0), so it renders after sprite2, appearing on top (see execution_table step 3).

What happens if two objects have the same sorting layer and order?

Unity renders them in an undefined order, usually based on their position in the scene hierarchy or draw call order, which can cause flickering or unexpected overlap.

Visual Quiz - 3 Questions

Look at the execution table, which sprite has the lowest render priority?

A sprite2

B sprite1

C sprite3

D None

💡 Hint

Check the Render Priority column in execution_table rows 1-3.

At which step does the object with the highest order in the Foreground layer get rendered?

A Step 1

B Step 2

C Step 3

D Step 4

💡 Hint

Look at the Order in Layer and Render Priority columns in execution_table.

If sprite2's order is changed to 2, how does that affect the visual result?

A sprite2 will appear on top of sprite3

B sprite3 will still appear on top

C sprite1 will appear on top

D No change in rendering order

💡 Hint

Higher order in the same layer means drawn later and appears on top (see execution_table step 3).

Concept Snapshot

Sorting layers group objects for rendering order.
Within a layer, order in layer decides draw priority.
Higher layers draw over lower layers.
Higher order in layer draws over lower order.
Use sorting layers and order to control visual stacking.

Full Transcript

In Unity, sorting layers and order control which objects appear on top visually. Each object gets a sorting layer name and an order number. Unity draws all objects in lower layers first, then higher layers. Within the same layer, objects with lower order numbers draw first, and higher order numbers draw on top. For example, sprite1 is in the Background layer with order 0, so it draws first. Sprite2 and sprite3 are in the Foreground layer, but sprite3 has order 1, so it draws after sprite2 and appears on top. If two objects share the same layer and order, their draw order is undefined and can cause flickering. Changing order numbers changes which object appears on top within the same layer.