Unity3D Shader实现动态星空

本文实例为大家分享了unity3d shader实现动态星空的具体代码，供大家参考，具体内容如下

shader "unlit/test"
{
properties
{
[gamma][header(cubemap)]_maincolor("maincolor",color)=(0.5,0.5,0.5,1)
_spec("spec",range(1,8))=1
[noscaleoffset]_tex("cubemap",cube)="black"{}
[header(rotation)][toggle(_enablerotation_on)]_enablerotation("enable rotation",float)=0
[intrange]_rotation("rotation",range(0,360))=0
_rotationspeed("rotationspeed",float)=1
[header(fog)][toggle(_enablefog_on)]_enablefog("enable fog",float)=0
_fogheight("fogheight",range(0,1))=1
_fogsmooth("fogsmooth",range(0.01,1))=0.01
_foghill("foghill",range(0,1))=0.5
 
 
}
subshader
{
tags { "rendertype"="background" "queue"="background" "ignoreprojector"="true" "forcenoshadowcasting"="true"}
lod 100
cull off
zwrite off
cgprogram
#include "unityshadervariables.cginc"
#include "unitycg.cginc"
#pragma target 3.0
#pragma shader_feature _enablerotation_on
#pragma shader_feature _enablefog_on
#pragma surface surf lint keepalpha noshadow noambient novertexlights nolightmap nodynlightmap nodirlightmap nofog nometa noforwardadd vertex:vertexro
 
 
struct input
{
float3 worldpos;
float3 vertextofrag;
};
 
 
uniform float4 _maincolor;
uniform float _spec;
uniform samplercube _tex;
uniform half _rotation;
uniform half _rotationspeed;
uniform half _fogheight;
uniform half _fogsmooth;
uniform half _foghill;
uniform half4 _tex_hdr;
 
 
half3 decode_hdr(half4 data)
{
return decodehdr(data,_tex_hdr);
}
void vertexro(inout appdata_full v,out input o)
{
unity_initialize_output(input,o);
float3 _worldpos=mul(unity_objecttoworld,v.vertex);
float _lerpresult=lerp(1.0,(unity_orthoparams.y/unity_orthoparams.x),unity_orthoparams.w);
float3 _append=float3(_worldpos.x,_worldpos.y*_lerpresult,_worldpos.z);
float3 _nor_append=normalize(_append);
float _timemove=_time.y;
float3 _timemove1=float3(cos(radians(_rotation+_timemove*_rotationspeed)),0,sin(radians(_rotation+_timemove*_rotationspeed))*-1);
float3 _timemove2=float3(0,_lerpresult,0);
float3 _timemove3=float3(sin(radians(_rotation+_timemove*_rotationspeed)),0,cos(radians(_rotation+_timemove*_rotationspeed)));
float3 _nor_worldpos=normalize(_worldpos);
#ifdef _enablerotation_on 
o.vertextofrag=mul(float3x3(_timemove1,_timemove2,_timemove3),_nor_worldpos);
#else
o.vertextofrag=_nor_append;
#endif
 
 
}
fixed4 lightinglint(surfaceoutput s,float3 lightdir,float atten)
{
return fixed4(0,0,0,s.alpha);
}
void surf(input i,inout surfaceoutput o)
{
half4 cubedata=texcube(_tex,i.vertextofrag);
half3 cubedatahdr=decode_hdr(cubedata);
float4 cubecolor=(float4(cubedatahdr,0))*_maincolor*_spec*unity_colorspacedouble;
float3 _nor_worldpos=normalize(i.worldpos);
float _lerpfog=lerp(saturate(pow(_nor_worldpos.y/_fogheight,1-_fogsmooth)),0,_foghill);
float4 finalcolor=lerp(unity_fogcolor,cubecolor,_lerpfog);
#ifdef _enablefog_on
o.emission=finalcolor.rgb;
#else
o.emission=cubecolor.rgb;
#endif
o.alpha=1;
 
 
}
endcg
}
 
}

spec：亮度

rotation：开始旋转角度，可以调节

rotationspeed：旋转速度

fog开头：雾化效果，可以看算法实现

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。