Unity Shader学习：皮毛渲染_unity shader毛发代码

Unity Shader学习：皮毛渲染

主要思路：将顶点延法线挤出，一层一层pass往外叠加形成毛发效果。
原文链接：https://blog.csdn.net/qq_24153371/article/details/81742337

噪声图：

cginc部分：

#include "Lighting.cginc"
#include "UnityCG.cginc"
#include "AutoLight.cginc"		

float4 _Color;
float4 _Specular;
float _Shininess;
sampler2D _MainTex;
float4 _MainTex_ST;
sampler2D _FurTex;
float4 _FurTex_ST;
float _FurLength;
float _FurDensity;
float _FurThinness;
float _FurShading;
float _RimPower;

struct v2f {
   
	float4 pos:SV_POSITION;
	float4 uv:TEXCOORD0;
	float3 worldNormal:TEXCOORD1;
	float3 worldPos:TEXCOORD2;
};

v2f vert_surface(appdata_base v) {
   
	v2f o;
	o.pos = UnityObjectToClipPos(v.vertex);
	o.uv.xy = TRANSFORM_TEX(v.texcoord, _MainTex);
	o.worldNormal = UnityObjectToWorldNormal(v.normal);
	o.worldPos = mul(unity_ObjectToWorld, v.vertex).xyz;
	return o;
}

//lambert+blinn-phone
float4 frag_surface(v2f i) :SV_Target{
   
	float3 worldNormal = normalize(i.worldNormal);
	float3 worldLight = normalize(_WorldSpaceLightPos0.xyz);
	float3 worldView = normalize(_WorldSpaceCameraPos.xyz - i.worldPos.xyz);
	float3 worldHalf = normalize(worldView + worldLight);
	float3 albedo = tex2D(_MainTex, i.uv.xy).rgb *_Color;	
	float3 ambient = UNITY_LIGHTMODEL_AMBIENT.xyz * albedo;
	float3 diffuse = _LightColor0.rgb*albedo*saturate(dot(worldNormal, worldLight));
	float3 specular = _LightColor0.rgb*_Specular.rgb*pow(saturate(dot(worldNormal, worldHalf)), _Shininess);
	float3 color = ambient + diffuse + specular;
	return float4(color, 1.0);
}

v2f vert_base(appdata_base v) {
   
	v2f o;
	//每个pass延法线挤出顶点
	float3 P = v.vertex.xyz + v.normal*_FurLength*FURSTEP;
	o.pos = UnityObjectToClipPos(float4(P, 1.0));
	o.uv.xy = TRANSFORM_TEX(v.texcoord, _MainTex);
	o.uv.<
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57