我要评论unity shader学习：相交算法实现简易防能量盾
主要思路：对比物体和场景深度图在观察空间下的深度差值，深度差越小表示相交，颜色越深，在加上边缘光勾出轮廓。
shader部分:
shader "unlit/depthoutline"
{
properties{
_maintex("maintex",2d) = "white"{}
_rimfactor("rimfactor",range(0.0,5.0))=1.0
_distancefactor("distancefactor",range(0.0,10.0))=1.0
_rimcolor("rimcolor",color)=(1,0,0,1)
_distancefactor2("distancefactor2",range(0.0,10.0))=1.0
_distancefactor3("distancefactor3",range(0.0,5.0)) = 1.0
}
subshader{
tags{"queue" = "transparent" "rendertype" = "transparent" "ignoreprojector"="true"}
pass{
blend srcalpha oneminussrcalpha
zwrite off
cull off
cgprogram
#include "unitycg.cginc"
#pragma vertex vert
#pragma fragment frag
sampler2d _maintex;
float4 _maintex_st;
sampler2d _cameradepthtexture;
float _rimfactor;
float _distancefactor;
float4 _rimcolor;
float _distancefactor2;
float _distancefactor3;
struct a2v {
float4 vertex:position;
float2 uv:texcoord0;
float3 normal:normal;
};
struct v2f {
float2 uv:texcoord0;
float4 pos:sv_position;
float4 screenpos:texcoord1;
float3 worldnormal:texcoord2;
float3 worldviewdir:texcoord3;
};
v2f vert(a2v v) {
v2f o;
o.pos = unityobjecttoclippos(v.vertex);
//computescreenpos函数，得到归一化前的视口坐标xy
//z分量为裁剪空间的z值，范围[-near,far]
o.screenpos = computescreenpos(o.pos);
o.uv = transform_tex(v.uv,_maintex);
//compute_eyedepth函数，将z分量范围[-near,far]转换为[near,far]
compute_eyedepth(o.screenpos.z);
o.worldnormal = unityobjecttoworldnormal(v.normal);
o.worldviewdir = worldspaceviewdir(v.vertex).xyz;
return o;
}
float4 frag(v2f i):sv_target {
float3 maintex = 1-tex2d(_maintex,i.uv).xyz;
//获取深度纹理,通过lineareyedepth函数将采样的深度纹理值转换为对应的深度范围[near~far]
float scenez = lineareyedepth(sample_depth_texture_proj(_cameradepthtexture,unity_proj_coord(i.screenpos)));
//观察空间深度差,值越小颜色值越大
float distance =1 - saturate(scenez - i.screenpos.z);
//消除内部深度变化较大时产生的锯齿
if (distance>0.999999)
{
distance = 0;
}
//调整深度差值的变化曲线
distance = pow(saturate(_distancefactor * log(distance) + _distancefactor3), _distancefactor2);
//角度越大边缘光越亮
float rim =1 - abs(dot(normalize(i.worldnormal), normalize(i.worldviewdir)));
rim = pow(rim, _rimfactor);
float4 col = float4(0,0,0,0);
col = lerp(col, float4(_rimcolor.rgb,0.3), maintex.r);
//根据边缘光以及深度差渐变
col = float4(_rimcolor.rgb,lerp(col.a,_rimcolor.a, distance));
col = lerp(col, _rimcolor, rim);
return col;
}
endcg
}
}
}
以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持移动技术网。
您可能感兴趣的文章:
如您对本文有疑问或者有任何想说的，请点击进行留言回复，万千网友为您解惑！
网友评论