Unity Shader Example 17 (Skybox)

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cs脚本，挂到Camera上

using UnityEngine;using System.Collections;public class Test : MonoBehaviour {    public Material skybox;// Will be called after all regular rendering is done//public void OnRenderObject ()    // OnPostRender is called after a camera has finished rendering the scene.    public void OnRenderObject(){// Apply the line material        Camera cam = GetComponent<Camera>();        GL.PushMatrix();// Set transformation matrix for drawing to// match our transform        //GL.MultMatrix( cam.worldToCameraMatrix);        //GL.LoadProjectionMatrix(cam.projectionMatrix);                // 前        Vector3 vft0 = new Vector3(-1.0f, 1.0f, -1.0f);        Vector3 vft3 = new Vector3(1.0f, 1.0f, -1.0f);        Vector3 vft2 = new Vector3(1.0f, -1.0f, -1.0f);        Vector3 vft1 = new Vector3(-1.0f, -1.0f, -1.0f);        // 后        Vector3 vbk0 = new Vector3(-1.0f, 1.0f, 1.0f);        Vector3 vbk1 = new Vector3(-1.0f, -1.0f, 1.0f);        Vector3 vbk2 = new Vector3(1.0f, -1.0f, 1.0f);        Vector3 vbk3 = new Vector3(1.0f, 1.0f, 1.0f);        // 左        Vector3 vlf0 = new Vector3(-1.0f, 1.0f, -1.0f);        Vector3 vlf1 = new Vector3(-1.0f, -1.0f, -1.0f);        Vector3 vlf2 = new Vector3(-1.0f, -1.0f, 1.0f);        Vector3 vlf3 = new Vector3(-1.0f, 1.0f, 1.0f);        // 右        Vector3 vrt0 = new Vector3(1.0f, 1.0f, -1.0f);        Vector3 vrt1 = new Vector3(1.0f, -1.0f, -1.0f);        Vector3 vrt2 = new Vector3(1.0f, -1.0f, 1.0f);        Vector3 vrt3 = new Vector3(1.0f, 1.0f, 1.0f);        //上        Vector3 vup0 = new Vector3(-1.0f, 1.0f, -1.0f);        Vector3 vup1 = new Vector3(1.0f, 1.0f, -1.0f);        Vector3 vup2 = new Vector3(1.0f, 1.0f, 1.0f);        Vector3 vup3 = new Vector3(-1.0f, 1.0f, 1.0f);        // 下        Vector3 vdn0 = new Vector3(-1.0f, -1.0f, -1.0f);        Vector3 vdn1 = new Vector3(1.0f, -1.0f, -1.0f);        Vector3 vdn2 = new Vector3(1.0f, -1.0f, 1.0f);        Vector3 vdn3 = new Vector3(-1.0f, -1.0f, 1.0f);        // 立方体先转到相机位置，再变换到相机空间(没有根据相机来旋转立方体)        Matrix4x4 m = Matrix4x4.TRS(cam.transform.position, Quaternion.identity, Vector3.one);        skybox.SetMatrix("view", cam.worldToCameraMatrix * m);        // 前        skybox.SetPass(1);        GL.Begin(GL.QUADS);        //1        GL.TexCoord(new Vector3(0, 1, 0));        GL.Vertex(vft0);        //2        GL.TexCoord(new Vector3(0, 0, 0));        GL.Vertex(vft1);        //3        GL.TexCoord(new Vector3(1, 0, 0));        GL.Vertex(vft2);        //4        GL.TexCoord(new Vector3(1, 1, 0));        GL.Vertex(vft3);        GL.End();                        // 左        skybox.SetPass(2);        GL.Begin(GL.QUADS);        //1        GL.TexCoord(new Vector3(1, 1, 0));        GL.Vertex(vlf0);        //2        GL.TexCoord(new Vector3(1, 0, 0));        GL.Vertex(vlf1);        //3        GL.TexCoord(new Vector3(0, 0, 0));        GL.Vertex(vlf2);        //4        GL.TexCoord(new Vector3(0, 1, 0));        GL.Vertex(vlf3);        GL.End();                //后        skybox.SetPass(0);        GL.Begin(GL.QUADS);        //1        GL.TexCoord(new Vector3(1, 1, 0));        GL.Vertex(vbk0);        //2        GL.TexCoord(new Vector3(1, 0, 0));        GL.Vertex(vbk1);        //3        GL.TexCoord(new Vector3(0, 0, 0));        GL.Vertex(vbk2);        //4        GL.TexCoord(new Vector3(0, 1, 0));        GL.Vertex(vbk3);        GL.End();                // 右        skybox.SetPass(3);        GL.Begin(GL.QUADS);        //1        GL.TexCoord(new Vector3(0, 1, 0));        GL.Vertex(vrt0);        //2        GL.TexCoord(new Vector3(0, 0, 0));        GL.Vertex(vrt1);        //3        GL.TexCoord(new Vector3(1, 0, 0));        GL.Vertex(vrt2);        //4        GL.TexCoord(new Vector3(1, 1, 0));        GL.Vertex(vrt3);        GL.End();        // 上        skybox.SetPass(4);        GL.Begin(GL.QUADS);        //1        GL.TexCoord(new Vector3(0, 1, 0));        GL.Vertex(vup0);        //2        GL.TexCoord(new Vector3(0, 0, 0));        GL.Vertex(vup1);        //3        GL.TexCoord(new Vector3(1, 0, 0));        GL.Vertex(vup2);        //4        GL.TexCoord(new Vector3(1, 1, 0));        GL.Vertex(vup3);        GL.End();        // 下        skybox.SetPass(5);        GL.Begin(GL.QUADS);        //1        GL.TexCoord(new Vector3(0, 0, 0));        GL.Vertex(vdn0);        //2        GL.TexCoord(new Vector3(0, 1, 0));        GL.Vertex(vdn1);        //3        GL.TexCoord(new Vector3(1, 1, 0));        GL.Vertex(vdn2);        //4        GL.TexCoord(new Vector3(1, 0, 0));        GL.Vertex(vdn3);        GL.End();                GL.PopMatrix ();}    }

.shader

Shader "Skybox/6 Sided Custom" {Properties {_Tint ("Tint Color", Color) = (.5, .5, .5, .5)[Gamma] _Exposure ("Exposure", Range(0, 8)) = 1.0_Rotation ("Rotation", Range(0, 360)) = 0[NoScaleOffset] _FrontTex ("Front [+Z]   (HDR)", 2D) = "grey" {}[NoScaleOffset] _BackTex ("Back [-Z]   (HDR)", 2D) = "grey" {}[NoScaleOffset] _LeftTex ("Left [+X]   (HDR)", 2D) = "grey" {}[NoScaleOffset] _RightTex ("Right [-X]   (HDR)", 2D) = "grey" {}[NoScaleOffset] _UpTex ("Up [+Y]   (HDR)", 2D) = "grey" {}[NoScaleOffset] _DownTex ("Down [-Y]   (HDR)", 2D) = "grey" {}}SubShader {Tags { "Queue"="Background" "RenderType"="Background" "PreviewType"="Skybox" }Cull Off ZWrite OffCGINCLUDE#include "UnityCG.cginc"half4 _Tint;half _Exposure;float _Rotation;float4x4 view;float4 RotateAroundYInDegrees (float4 vertex, float degrees){float alpha = degrees * UNITY_PI / 180.0;float sina, cosa;sincos(alpha, sina, cosa);float2x2 m = float2x2(cosa, -sina, sina, cosa);return float4(mul(m, vertex.xz), vertex.yw).xzyw;}struct appdata_t {float4 vertex : POSITION;float2 texcoord : TEXCOORD0;};struct v2f {float4 vertex : SV_POSITION;float2 texcoord : TEXCOORD0;};v2f vert (appdata_t v){v2f o;// 立方体先转到相机位置，再变换到相机空间(没有根据相机来旋转立方体)v.vertex = mul(view, v.vertex);v.vertex = RotateAroundYInDegrees(v.vertex, _Rotation);o.vertex = mul(UNITY_MATRIX_P, v.vertex);// 设置深度值为1，最大o.vertex.z = o.vertex.w;o.texcoord = v.texcoord;return o;}half4 skybox_simply_frag(v2f i, sampler2D smp){half4 tex = tex2D (smp, i.texcoord);return tex;}ENDCGPass {CGPROGRAM#pragma vertex vert#pragma fragment fragsampler2D _FrontTex;half4 frag (v2f i) : SV_Target { return skybox_simply_frag(i,_FrontTex); }ENDCG }Pass{CGPROGRAM#pragma vertex vert#pragma fragment fragsampler2D _BackTex;half4 frag (v2f i) : SV_Target { return skybox_simply_frag(i,_BackTex); }ENDCG }Pass{CGPROGRAM#pragma vertex vert#pragma fragment fragsampler2D _LeftTex;half4 frag (v2f i) : SV_Target { return skybox_simply_frag(i,_LeftTex); }ENDCG}Pass{CGPROGRAM#pragma vertex vert#pragma fragment fragsampler2D _RightTex;half4 frag (v2f i) : SV_Target { return skybox_simply_frag(i,_RightTex); }ENDCG}Pass{CGPROGRAM#pragma vertex vert#pragma fragment fragsampler2D _UpTex;half4 frag (v2f i) : SV_Target { return skybox_simply_frag(i,_UpTex); }ENDCG}Pass{CGPROGRAM#pragma vertex vert#pragma fragment fragsampler2D _DownTex;half4 frag (v2f i) : SV_Target { return skybox_simply_frag(i,_DownTex); }ENDCG}}}

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