回复：【伪直播】看完星际穿越，迫不及待想做一个虫洞演示程序

这是最终天空盒的shader
这个shader利用了之前的光谱。。
Shader "Zhouxun/Universe/Skybox (wormhole)"
{
Properties
{
_SkyboxA ("Space A skybox", CUBE) = "" {}
_SkyboxB ("Space B skybox", CUBE) = "" {}
_Spectrum ("Wormhole Spectrum", 2D) = "" {}
_CamPos ("Camera Position", Vector) = (100,0,0,0)
}
SubShader
{
Tags
{
"RenderType" = "Opaque"
"Queue" = "Background"
}
Fog { Mode Off }
Pass
{
Cull Off
CGPROGRAM
#pragma vertex vert
#pragma fragment frag
#pragma target 3.0
#include "UnityCG.cginc"
samplerCUBE _SkyboxA;
samplerCUBE _SkyboxB;
sampler2D _Spectrum;
float4 _CamPos;
struct appdata_skybox
{
float4 vertex : POSITION;
};
struct v2f
{
float3 wp : TEXCOORD0;
float4 pos : POSITION0;
};
half4 FinalColor (float4 photon)
{
return lerp (texCUBE(_SkyboxB, normalize(photon.yzx)),
texCUBE(_SkyboxA, normalize(photon.xyz)),
saturate((photon.w + 1) * 0.5));
}
#define PI (3.141592654)
#define SPEC_SIZE (2048)
#define SPEC_PIXEL (0.00048828125)
#define SPEC_HALF_PIXEL (0.000244140625)
float2 OutputAngle2D (float input_angle, float input_space, float dist)
{
float2 tc = 0;
tc.x = (input_angle / PI) * (SPEC_SIZE - 1);
tc.y = sqrt(max(0,dist-10))*111.1111111;
float2 frac_tc = float2(frac(tc.x), frac(tc.y));
float2 tc00 = float2(tc.x, tc.y) * SPEC_PIXEL;
float2 tc10 = float2(tc.x + 1, tc.y) * SPEC_PIXEL;
float2 tc01 = float2(tc.x, tc.y) * SPEC_PIXEL;
float2 tc11 = float2(tc.x + 1, tc.y + 1) * SPEC_PIXEL;
float3 c00 = tex2D(_Spectrum, tc00).rgb;
float output_angle00 = ((round(c00.r * 255) + round(c00.b * 255) * 256) - 32768) * 0.0001;
float output_space00 = ((c00.g - 0.25) * 4) * input_space;
float3 c10 = tex2D(_Spectrum, tc10).rgb;
float output_angle10 = ((round(c10.r * 255) + round(c10.b * 255) * 256) - 32768) * 0.0001;
float output_space10 = ((c10.g - 0.25) * 4) * input_space;
float3 c01 = tex2D(_Spectrum, tc01).rgb;
float output_angle01 = ((round(c01.r * 255) + round(c01.b * 255) * 256) - 32768) * 0.0001;
float output_space01 = ((c01.g - 0.25) * 4) * input_space;
float3 c11 = tex2D(_Spectrum, tc11).rgb;
float output_angle11 = ((round(c11.r * 255) + round(c11.b * 255) * 256) - 32768) * 0.0001;
float output_space11 = ((c11.g - 0.25) * 4) * input_space;
float output_angle = lerp(lerp(output_angle00, output_angle10, frac_tc.x),
lerp(output_angle01, output_angle11, frac_tc.x), frac_tc.y);
float output_space = lerp(lerp(output_space00, output_space10, frac_tc.x),
lerp(output_space01, output_space11, frac_tc.x), frac_tc.y);
return float2(output_angle, output_space);
}
v2f vert (appdata_skybox v)
{
v2f o;
o.wp.xyz = v.vertex.xyz;
o.pos = mul(UNITY_MATRIX_MVP, v.vertex);
return o;
}
half4 frag (v2f i) : COLOR
{
float input_space = _CamPos.w;
float3 dir = normalize(i.wp);
//dir.x *= input_space;
float3 elem = -_CamPos.xyz;
float3 n_elem = normalize(elem);
float input_angle = acos(clamp(dot(dir, n_elem), -1, 1));
float dist = length(elem);
float2 output2d = OutputAngle2D(input_angle, input_space, dist);
float3 axis = normalize(cross(dir, n_elem));
float3 curv = normalize(cross(n_elem, axis));
float _x = cos(output2d.x);
float _y = sin(output2d.x);
float3 output_dir = _x * n_elem + _y * curv;
return pow(FinalColor(float4(output_dir, output2d.y)),1.7);
}
ENDCG
}
}
}