Question

JavaScript => public function SetPass(pass: int): bool;
C# => public bool SetPass(int pass);

Parameters 参数

pass	Shader pass number to setup. 设置材质的通道数。

Returns 返回值

bool If false is returned, no rendering should be done.

返回布尔值，如果为false，将不渲染。

Description 描述

Activate the given pass for rendering.

为渲染激活给定的pass。

Pass indices start from zero and go up to (but not including) passCount.

传递从0开始最大到（但不包括）passCount 的索引。

This is mostly used in direct drawing code using GL class. For example, Image Effects use materials for implementing screen post-processing. For each pass in the material they activate the pass and draw a fullscreen quad.

这主要用于使用 GL 类直接绘图代码中 （Unity 专业版）。比如图像效果使用执行屏幕后处理的材质。在材质中的每一个Pass都会激活（见 SetPass）并绘制全屏四边形

If SetPass returns false, you should not render anything. This is typically the case for special pass types that aren't meant for rendering, like GrabPass.

如果SetPass 返回 false，不会渲染任何东西。在这种情况下指定的通道类型意味着不渲染，像GrabPass。

JavaScript:

#pragma strict
// A script that when attached to the camera, makes the resulting
// colors inverted. See its effect in play mode.
private var mat: Material;
// Will be called from camera after regular rendering is done.
public function OnPostRender() {
	if (!mat) {
		// a blend mode that inverts destination colors.			
		var shader: var = Shader.Find("Hidden/Internal-Colored");
		mat = new Material(shader);
		mat.hideFlags = HideFlags.HideAndDontSave;
		// Set blend mode to invert destination colors.
		mat.SetInt("_SrcBlend", intUnityEngine.Rendering.BlendMode.OneMinusDstColor);
		mat.SetInt("_DstBlend", intUnityEngine.Rendering.BlendMode.Zero);
		// Turn off backface culling, depth writes, depth test.
		mat.SetInt("_Cull", intUnityEngine.Rendering.CullMode.Off);
		mat.SetInt("_ZWrite", 0);
		mat.SetInt("_ZTest", intUnityEngine.Rendering.CompareFunction.Always);
	}
	GL.PushMatrix();
	GL.LoadOrtho();
	// activate the first shader pass (in this case we know it is the only pass)
	mat.SetPass(0);
	// draw a quad over whole screen
	GL.Begin(GL.QUADS);
	GL.Vertex3(0, 0, 0);
	GL.Vertex3(1, 0, 0);
	GL.Vertex3(1, 1, 0);
	GL.Vertex3(0, 1, 0);
	GL.End();
	GL.PopMatrix();
}

C#:

using UnityEngine;
 
// A script that when attached to the camera, makes the resulting
// colors inverted. See its effect in play mode.
public class ExampleClass : MonoBehaviour
{
    private Material mat;
 
    // Will be called from camera after regular rendering is done.
    public void OnPostRender ()
    {
        if (!mat)
        {
            // Unity has a built-in shader that is useful for drawing
            // simple colored things. In this case, we just want to use
            // a blend mode that inverts destination colors.			
            var shader = Shader.Find ("Hidden/Internal-Colored");
            mat = new Material (shader);
            mat.hideFlags = HideFlags.HideAndDontSave;
            // Set blend mode to invert destination colors.
            mat.SetInt ("_SrcBlend", (int)UnityEngine.Rendering.BlendMode.OneMinusDstColor);
            mat.SetInt ("_DstBlend", (int)UnityEngine.Rendering.BlendMode.Zero);
            // Turn off backface culling, depth writes, depth test.
            mat.SetInt ("_Cull", (int)UnityEngine.Rendering.CullMode.Off);
            mat.SetInt ("_ZWrite", 0);
            mat.SetInt ("_ZTest", (int)UnityEngine.Rendering.CompareFunction.Always);
        }
 
        GL.PushMatrix ();
        GL.LoadOrtho ();
 
        // activate the first shader pass (in this case we know it is the only pass)
        mat.SetPass (0);
        // draw a quad over whole screen
        GL.Begin (GL.QUADS);
        GL.Vertex3 (0, 0, 0);
        GL.Vertex3 (1, 0, 0);
        GL.Vertex3 (1, 1, 0);
        GL.Vertex3 (0, 1, 0);
        GL.End ();
 
        GL.PopMatrix ();
    }
}

Material