1.原始的shader

Shader "Custom/MVP"
{
    SubShader
    {
        Tags { "RenderType"="Opaque" }
        LOD 100

        Pass
        {
            CGPROGRAM
            #pragma vertex vert
            #pragma fragment frag

            #include "UnityCG.cginc"

            struct appdata
            {
                float4 vertex : POSITION;
                float2 uv : TEXCOORD0;
            };

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

            float4x4 mvp;

            v2f vert (appdata v)
            {

                v2f o;
                //传入片段着色器的坐标值
                o.vertex = mul(mvp,v.vertex);
                o.uv = v.uv;
                return o;
            }

            fixed4 frag (v2f i) : SV_Target
            {
                return fixed4(1,0,0,1);
            }
            ENDCG
        }
    }
}

效果:

1.自定义的mvp矩阵，从脚本中传入
shader代码

Shader "Custom/MVP"
{
    SubShader
    {
        Tags { "RenderType"="Opaque" }
        LOD 100

        Pass
        {
            CGPROGRAM
            #pragma vertex vert
            #pragma fragment frag

            #include "UnityCG.cginc"

            struct appdata
            {
                float4 vertex : POSITION;
                float2 uv : TEXCOORD0;
            };

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

            float4x4 mvp;

            v2f vert (appdata v)
            {

                v2f o;
                //传入片段着色器的坐标值
                o.vertex = mul(mvp,v.vertex);
                o.uv = v.uv;
                return o;
            }

            fixed4 frag (v2f i) : SV_Target
            {
                return fixed4(1,0,0,1);
            }
            ENDCG
        }
    }
}

没传值

用C#代码传值进去,就能正常显示了,但是不推荐这样写。测试矩阵罢了。

using System.Collections;
using System.Collections.Generic;
using UnityEngine;

public class mvp : MonoBehaviour
{
    private MeshRenderer rend;
    private Material mat;
    void Start()
    {
        rend = GetComponent<MeshRenderer>();
        mat = rend.material;
    }

    // Update is called once per frame
    void Update()
    {
        Matrix4x4 m4 = Camera.main.projectionMatrix * Camera.main.worldToCameraMatrix * transform.localToWorldMatrix;
        mat.SetMatrix("mvp",m4);
    }
}