Material.SetMatrix

参数

描述

为着色器设置指定的矩阵。

这主要用于需要额外矩阵参数的自定义 着色器。矩阵参数不会在材质 Inspector 中公开， 但是可以在脚本中使用 SetMatrix 和 GetMatrix 进行设置和查询。

另请参阅：GetMatrix、Materials、ShaderLab documentation、Shader.PropertyToID、Properties in Shader Programs。

using UnityEngine;

public class ExampleClass : MonoBehaviour
{
    // Attach to an object that has a Renderer component,
    // and use material with the shader below.
    public float rotateSpeed = 30f;
    public void Update ()
    {
        // Construct a rotation matrix and set it for the shader
        Quaternion rot = Quaternion.Euler (0, 0, Time.time * rotateSpeed);
        Matrix4x4 m = Matrix4x4.TRS (Vector3.zero, rot, Vector3.one);
        GetComponent<Renderer>().material.SetMatrix ("_TextureRotation", m);
    }
}

// Use this shader on an object together with the above example script.
// The shader transforms texture coordinates with a matrix set from a script.
Shader "RotatingTexture"
{
    Properties
    {
        _MainTex ("Base (RGB)", 2D) = "white" {}
    }
    SubShader
    {
        Pass
        {
            CGPROGRAM
            #pragma vertex vert
            #pragma fragment frag

            struct v2f
            {
                float2 uv : TEXCOORD0;
                float4 pos : SV_POSITION;
            };

            float4x4 _TextureRotation;

            v2f vert (float4 pos : POSITION, float2 uv : TEXCOORD0)
            {
                v2f o;
                o.pos = UnityObjectToClipPos(pos);
                o.uv = mul(_TextureRotation, float4(uv,0,1)).xy;
                return o;
            }

            sampler2D _MainTex;
            fixed4 frag (v2f i) : SV_Target
            {
                return tex2D(_MainTex, i.uv);
            }
            ENDCG
        }
    }
}