1.shader代码

// Upgrade NOTE: replaced '_Object2World' with 'unity_ObjectToWorld'

Shader "Custom/OpaVertColor"
{
    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
            {
                float4 vertex : SV_POSITION;
                fixed4 vcol : COLOR;
            };


            v2f vert (appdata v)
            {
                v2f o;
                float4 wpos = mul(unity_ObjectToWorld,v.vertex);
                if(wpos.x > 0){
                    o.vcol = fixed4(1,0,0,1);
                }else{
                    o.vcol = fixed4(0,0,1,1);
                }
                o.vertex = UnityObjectToClipPos(v.vertex);
                return o;
            }

            fixed4 frag (v2f i) : SV_Target
            {

                return i.vcol;
            }
            ENDCG
        }
    }
}

2.c#代码

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

public class MoveCube : MonoBehaviour
{
    void Start()
    {

    }
    void Update()
    {
        transform.position = new Vector3(Mathf.Sin(Time.realtimeSinceStartup * 2.0f) * 2.0f, 0, 0);
    }
}

3.效果: