unity shader - 毛发渲染，飘逸的毛发_unity 头发shader

//表面皮肤渲染
Pass
{
    CGPROGRAM
               
    #pragma vertex vert_surface//点着色器 ， 对应引用cginc中的方法
    #pragma fragment frag_surface// 片段着色器 ， 对应引用cginc中的方法
    #define FURSTEP 0.0 
    #include "FurHelper.cginc" // 引用的shader
               
    ENDCG
               
}
// 毛的渲染
Pass
{
    CGPROGRAM
               
    #pragma vertex vert_base //点着色器 ， 对应引用cginc中的方法
    #pragma fragment frag_base // 片段着色器 ， 对应引用cginc中的方法
    #define FURSTEP 0.05 // 皮毛的长度
    #include "FurHelper.cginc" // 引用的shader
               
    ENDCG
               
}

            v2f vert(a2v v)
            {
                v2f o;
                float3 OffetVertex = v.vertex.xyz + v.normal * _LayerOffset *_FurLength;//顶点外扩
                OffetVertex += mul(unity_WorldToObject, _FurOffset);//顶点受力偏移【加一个方向上的偏移，看起来更自然，例如向下垂】
            }

fixed3 noise = tex2D(_FurTex, i.uv.zw ).rgb; 
fixed alpha = saturate(noise - (_LayerOffset * _LayerOffset + _LayerOffset * _FurDensity));

// 生成， material赋值， shader赋值
void CreateShell()
{
    CheckParent();
    layers = new GameObject[LayerCount];
    float furOffset = 1.0f/ LayerCount;
    for (int i = 0; i< LayerCount; i++)
    {
        //复制渲染的原模型一遍
        GameObject layer = Instantiate(Target.gameObject, Target.transform.position, Target.transform.rotation);
        layer.transform.parent = _parent;
        layer.GetComponent<Renderer>().sharedMaterials = new Material[1];
        layer.GetComponent<Renderer>().sharedMaterial = ResetSharedMaterials(i, furOffset);
        layers[i] = layer;
    }
}
 
// shader 赋值
Material ResetSharedMaterials(int index, float furOffset)
{
    Material special = new Material(ShellShader);
    if (special != null)
    {
        special.SetTexture("_MainTex", Target.sharedMaterial.GetTexture("_MainTex"));
        special.SetColor("_Color", FurColor);
        special.SetColor("_RootColor", FurRootColor);
        special.SetColor("_RimColor", FurRimColor);
        special.SetColor("_Specular", FurSpecularColor);
        special.SetFloat("_Shininess", Shininess);
        special.SetFloat("_RimPower", RimPower);
        special.SetFloat("_FurShadow", FurShadow);
        special.SetTexture("_FurTex",FurPattern);
        special.SetFloat("_FurLength", FurLength);
        special.SetFloat("_FurDensity", FurDensity);
        special.SetFloat("_FurThinness", FurThinness);
        special.SetFloat("_LayerOffset", index * furOffset);            //不同Shell的偏移参数不一样
        special.SetVector("_FurOffset", FurForce* Mathf.Pow(  index*furOffset,FurTenacity));//计算受力、层数和硬度共同影响的Shell偏移
        special.renderQueue = 3000 + index;//由于在单通道渲染半透明材质,进行了深度写入，为了防止被深度剔除，所以要手动更改渲染队列
    }
    return special;
}
 
 
// 移动
void UpdateShellTrans()
{
    if (layers == null || layers.Length == 0)
    {
        return;
    }
    for (int i = 0; i < layers.Length; i++)
    {
        //位置和旋转Lerp到目标模型
        layers[i].gameObject.transform.position = Vector3.Lerp(layers[i].gameObject.transform.position, Target.transform.position, lerpSpeed * Time.deltaTime *20);
        layers[i].gameObject.transform.rotation = Quaternion.Lerp(layers[i].gameObject.transform.rotation, Target.transform.rotation, lerpSpeed * Time.deltaTime *10);
    }
}