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This article mainly introduces "how to use rendering queue for deep sorting in Unity3d shader Queue". In daily operation, I believe many people have doubts about how to use rendering queue for deep sorting in Unity3d shader Queue. Xiaobian consulted various materials and sorted out simple and easy operation methods. I hope to help you answer the doubts about "how to use rendering queue for deep sorting in Unity3d shader"! Next, please follow the small series to learn together!

preparations

Create a new scene and two spheres and line them up. Our goal is (no cavities!), Whatever their actual coordinates in 3D space are, we can arrange them in the order you want, i.e. who is above whom.

In order to see the change in drawing order, we need at least two Shaders. So, we create two new Shaders, and we can name them Depth001 and Depth002, respectively.

Your scene should look similar to the image below.

achieve

The code for the Shader section is actually quite simple; it only requires two new lines of code.

First we decide to draw the target image into a new render queue. To do this, we need to modify the Tags{} block, i.e. inside the SubShader{}:

Tags { "Queue"="Geometry-20" }

Then, we need to tell Unity that we want to control the rendering order of this object ourselves and not write it to the depth cache. Add the following code below the previous code:

ZWrite Off

Save and return to Unity for viewing. You will find one of these spheres appearing behind all objects, even when its actual coordinates in 3D space are in front of all objects. As shown below:

Finally, the complete code is as follows:

Shader "Custom/Depth001" { Properties { _MainTex ("Base (RGB)", 2D) = "white" {} } SubShader { Tags { "Queue"="Geometry-20" } ZWrite Off LOD 200 CGPROGRAM #pragma surface surf Lambert sampler2D _MainTex; struct Input { float2 uv_MainTex; }; void surf (Input IN, inout SurfaceOutput o) { half4 c = tex2D (_MainTex, IN.uv_MainTex); o.Albedo = c.rgb; o.Alpha = c.a; } ENDCG } FallBack "Diffuse" } explain

By default, Unity sorts your objects based on how close they are to the camera. Therefore, the closer an object is to the camera, the more it will be drawn on top of other objects farther away. For most cases this is valid and appropriate, but in some special cases you may want to control the order in which objects are drawn. And with the Tags{} block we can get that control.

Unity provides us with default render queues, each with a unique value that directs Unity to draw objects to the screen. These built-in render queues are called Background, Geometry, AlphaTest, Transparent, Qverlay. These queues weren't created randomly, they were created to make it easier for us to write Shader and handle real-time rendering. The following table describes the usage of these render queues:

Render Queue Render Queue Description Render Queue Value Background This queue is rendered first. It is used for skyboxes and so on. 1000Geometry This is the default render queue. It is used for most objects. Opaque geometry uses this queue. 2000 Geometry checked by AlphaTest channel uses this queue. It differs from Geometry queues in that it is more efficient for objects that are rendered after all solid objects have been drawn for channel checking. 2450Transparent This render queue is rendered after the Geometry and AlphaTest queues. Any channel-blended (that is, Shaders that are not written to the depth cache) objects use this queue, such as glass and particle effects. 3000Overlay This render queue is for overlay effects. Any last rendered object uses this queue, such as lens flare. 4000

So, once you know which render queue your object belongs to, you can assign it a built-in render queue label. Our Shader uses Geometry queues, so we write: Tags { "Queue"="Geometry" }. However, we want to tell us that the object is drawn after all objects in our Geometry queue and before the Background queue object, so we modify it to Tags { "Queue"="Geometry-20" }. This tells Unity that we want to treat this object as a solid object, but render it behind all other opaque objects.

Note: Geometry corresponds to a queue value of 2000, so "Geometry-20" means using a queue value of 1980, while a smaller number means that the earlier it is rendered, the later it is rendered.

Finally, we declare the ZWrite tag in the SubShader block. This tells Unity that we want to override the depth ordering of the object, and we will assign it a new render queue. So, we simply set the ZWrite value to Off. (No effect if not set)

At this point, the study of "How to use the rendering queue for deep sorting in Queue in Unity3d shader" is over, hoping to solve everyone's doubts. Theory and practice can better match to help you learn, go and try it! If you want to continue learning more relevant knowledge, please continue to pay attention to the website, Xiaobian will continue to strive to bring more practical articles for everyone!

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