Unity&Shader案例篇—膨胀效果

原文链接 ： http://www.manew.com/thread-99195-1-1.html

效果：
 


Shader "CgInUnity/Glow"
{
Properties{
_Color("Object's Color", Color) = (0, 1, 0, 1)
_GlowColor("Glow's Color", Color) = (1, 0, 0, 0)
_Strength("Glow Strength", Range(5.0, 1.0)) = 2.0
_GlowRange("GlowRange",Range(0.1,1))=0.3
}
SubShader{
Pass{
Tags{ "LightMode" = "ForwardBase" }

CGPROGRAM

#pragma vertex vert
#pragma fragment frag

float4 _Color;

float4 vert(float4 vertexPos : POSITION) : SV_POSITION{
return mul(UNITY_MATRIX_MVP, vertexPos);
}

float4 frag(void) : COLOR{
return _Color;
}

ENDCG
}

Pass{
Tags{"LightMode" = "ForwardBase" "Queue" = "Transparent" "RenderType" = "Transparent"}
// Cull Front
ZWrite Off

Blend SrcAlpha OneMinusSrcAlpha

CGPROGRAM

#pragma vertex vert
#pragma fragment frag
#include "UnityCG.cginc"

float4 _GlowColor;
float _Strength;;
float _GlowRange;
struct vInput {
float4 vertex : POSITION;
float4 normal : NORMAL;
};

struct v2f {
float4 position : SV_POSITION;
float4 col:COLOR;
};

v2f vert(vInput i) {
v2f o;

float4x4 modelMatrix = _Object2World;
float4x4 modelMatrixInverse = _World2Object;

float3 normalDirection = normalize(mul(i.normal, modelMatrixInverse)).xyz;
float3 viewDirection = normalize(_WorldSpaceCameraPos - mul(modelMatrix, i.vertex).xyz);

float4 pos = i.vertex + (i.normal * _GlowRange);

o.position = mul(UNITY_MATRIX_MVP, pos);

float3 normalDirectionT = normalize(normalDirection);
float3 viewDirectionT = normalize(viewDirection);
float strength = abs(dot(viewDirectionT, normalDirectionT));
float opacity = pow(strength, _Strength);

float4 col = float4(_GlowColor.xyz, opacity);

o.col = col;

return o;
}

float4 frag(v2f i) : COLOR{

return i.col;
}

ENDCG
}
}
}

控制部分的C#代码：
using UnityEngine;
using System.Collections;

public class GlowControl : MonoBehaviour {
private Material mat;
private float value;
[SerializeField]
float speed=1;

// Use this for initialization
void Start () {
mat = GetComponent<MeshRenderer>().sharedMaterial;

}

// Update is called once per frame
void Update () {

value = Mathf.PingPong(Time.time * speed, 5);
/// Debug.Log(value);
mat.SetFloat("_Strength", value);

}
}