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Unity图形学之Shader顶点变化

article 2024/11/24 3:23:05

1.Unity3D 5.0 以后：Pass被隐藏起来，通过调节SurfaceOutputStandard 和 SurfaceOutputStandardSpecular的参数就能出现比较好的效果

#pragma surface surf Standard fullforwardshadows

void surf (Input IN, inout SurfaceOutputStandard o)

#pragma surface surf StandardSpecular  fullforwardshadows

void surf (Input IN, inout SurfaceOutputStandardSpecular o)

2.自定义灯光渲染接口：

#pragma surface surf Lambert finalcolor:mycolor vertex:myvert

（1）Vertex：定义顶点着色器的入口函数

（2）Surf：Surface 入口函数可以看成是片段着色器

（3）Lambert：定义灯光作用的入口函数

（4）Finalcolor：计算雾最后一次计算像素的入口函数

（5）Surface vertex：

3.Inout：表示即是输入也是输出

Float：精度是32

Half：精度是16

Fixed:精度是12

Shader "Custom/TestVertex"
{
    Properties
    {
        _Color ("Color", Color) = (1,1,1,1)
        _MainTex ("Albedo (RGB)", 2D) = "white" {}
        _Glossiness ("Smoothness", Range(0,1)) = 0.5
        _Metallic ("Metallic", Range(0,1)) = 0.0
        
        _ChangeRange ("Position",float) = 2.0
    }
    SubShader
    {
        Tags { "RenderType"="Opaque" }
        LOD 200
        CGPROGRAM
        // Physically based Standard lighting model, and enable shadows on all  light types
        #pragma surface surf Lambert  vertex:myvert
        // Use shader model 3.0 target, to get nicer looking lighting
        #pragma target 3.0
        sampler2D _MainTex;
        struct Input
        {
            float2 uv_MainTex;
        };
        half _Glossiness;
        half _Metallic;
        fixed4 _Color;
        // Add instancing support for this shader. You need to check 'Enable  Instancing' on materials that use the shader.
        // See https://docs.unity3d.com/Manual/GPUInstancing.html for more  information about instancing.
        // #pragma instancing_options assumeuniformscaling
        UNITY_INSTANCING_BUFFER_START(Props)
            // put more per-instance properties here
        UNITY_INSTANCING_BUFFER_END(Props)
        half _ChangeRange;
        //顶点着色器  一般是改变位置大小
        void myvert(inout appdata_base v){
            
            //v.vertex.xyz *=2;
            //v.vertex.xyz +=2;
            //v.vertex.xyz *=_ChangeRange;
            v.vertex.xyz += v.normal *_ChangeRange;
        }
        //SurfaceOutput 作为下一个流程的输入 传递给灯光Lambert
        void surf (Input IN, inout SurfaceOutput o)
        {
            //从_MainTex进行纹理采样
            o.Albedo = tex2D(_MainTex,IN.uv_MainTex).rgb;
            
        }
        ENDCG
    }
    FallBack "Diffuse"
}