Shader "sliceSahder"
{Properties{_facadeColor("FacadeColor", Color) = (1,1,1,1)_backColor("BackColor", Color) = (1,1,1,1)_height("Height", Range(-1,1)) = 0.0}SubShader{Tags{"DisableBatching" = "True""Queue" = "Transparent""RenderType" = "Transparent"}Pass{Tags {"RenderType" = "Opaque" "Queue" = "Geometry"}Zwrite OnCull Off AlphaToMask On //改善AlphaTest抗锯齿CGPROGRAM#pragma vertex vert#pragma fragment frag#include "UnityCG.cginc"struct appdata{float4 vertex : POSITION;};struct v2f{float4 vertex : SV_POSITION;float3 worldPos : TEXCOORD0;};float _height;float4 _backColor, _facadeColor;float4 _SliceObjectPos;v2f vert(appdata v){v2f o = (v2f)0;o.vertex = UnityObjectToClipPos(v.vertex);float3 wPos = mul(unity_ObjectToWorld, v.vertex.xyz);//_SliceObjectPos是模型的世界空间位置,我们要控制切片范围在box内o.worldPos = wPos + _SliceObjectPos .xyz;return o;}float4 frag(v2f i, fixed facing : VFACE) : SV_Target{float4 heightResult = step(i.worldPos.y + _height,0);float4 facade = heightResult * _facadeColor;float4 back = heightResult * _backColor;float4 finalColor = 0;if (facing > 0){finalColor = facade;}else{finalColor = back;}clip(finalColor.a - 0.5);return finalColor;}ENDCG}}
}

    private void OnDrawGizmos(){Gizmos.color = boxColor * new Color(0.5f, 0.5f, 0.5f, 0.5f);Gizmos.DrawWireCube(transform.position, transform.localScale);}

public Camera CreateCamera(){controlBox controlFun = (controlBox)target;if (controlGameObject != null){return xRayCamera;}else{controlGameObject = new GameObject("SliceCam");controlGameObject.transform.SetParent(controlFun.transform);controlGameObject.hideFlags = HideFlags.DontSave;Vector3 LocalScale = controlFun.transform.localScale;float CamPos = LocalScale.y / 2;//保正相机在box 顶部向下看controlGameObject.transform.position = controlFun.transform.position + new Vector3(0, CamPos, 0);controlGameObject.transform.localEulerAngles = new Vector3(90, 0, 0);xRayCamera = controlGameObject.AddComponent<Camera>();xRayCamera.clearFlags = CameraClearFlags.SolidColor;xRayCamera.backgroundColor = Color.black;//背景要设置黑色xRayCamera.orthographic = true;xRayCamera.orthographicSize = CamPos;xRayCamera.nearClipPlane = 0;//box最顶面xRayCamera.farClipPlane = LocalScale.y;//box最底面xRayCamera.enabled = true;xRayCamera.renderingPath = RenderingPath.Forward;int maskLayer = 1 << 31;//设置一个专用层xRayCamera.cullingMask = maskLayer;return xRayCamera;}}

float RamapValue(float original, float oldMinVal, float oldMaxVal, float newMinVal, float newMaxVal){float calculate = (original - oldMinVal) * (newMaxVal - newMinVal) / (oldMaxVal - oldMinVal) + newMinVal;return calculate;}private void CreateTextureArray(bool Blur){controlBox controlFun = (controlBox)target;int sliceCount = controlFun.SliceCountLayer;Texture3DArray = new Texture2D[sliceCount];for (int i = 0; i < sliceCount; i++){serializedObject.Update();//如果是Editor的类一定要加这个,否则不刷新//使用 Alpha8 减少贴图大小RenderTexture xRayLayer = new RenderTexture(sliceCount, sliceCount, 24, RenderTextureFormat.R8);// 重映射值，如设置128层,shader中(-0.5，0.5) 那么每层步进 0.007813 float setLayer = RamapValue(i, 0, sliceCount(128), controlFun.MinMax.x(-0.5), controlFun.MinMax.y(0.5));if (Blur){controlFun.BlurMaterial.SetTexture("_VolumeTex", BuildTexture3D);controlFun.BlurMaterial.SetFloat("_offset", setLayer);}else{controlFun.SliceMaterial.SetFloat("_height", setLayer);//设置每层偏移参数}xRayCamera.targetTexture = xRayLayer;xRayCamera.Render();Texture2D texture2D = new Texture2D(sliceCount, sliceCount, TextureFormat.R8, false);RenderTexture.active = xRayLayer;texture2D.ReadPixels(new Rect(0, 0, sliceCount, sliceCount), 0, 0);texture2D.Apply();Texture3DArray[i] = texture2D;//这时也可以保存每层出来看一下//bytes = texture2D.EncodeToPNG();//File.WriteAllBytes("Assets/Texture3DTemp/My3DTexture" + i + ".png", bytes);serializedObject.ApplyModifiedProperties();}//AssetDatabase.ImportAsset("Assets/Texture3DTemp");}

public void Create3DTexture(bool blur, bool save){CreateCamera();CreateTextureArray(blur);int width = Texture3DArray[0].width;int height = Texture3DArray[0].height;int depth = Texture3DArray.Length;BuildTexture3D = new Texture3D(width, height, depth, TextureFormat.R8, true);var color3d = new Color[width * height * depth];int idx = 0;for (int z = depth-1; z >= 0; z--) //反向读取 写入3D贴图{UIProgressBar(true, blur, (int)RamapValue(z, depth,0,0, depth));//进度条显示Texture2D loadedtexture = Texture3DArray[z];for (int y = 0; y < height; ++y){for (int x = 0; x < width; ++x, ++idx){color3d[idx] = loadedtexture.GetPixel(x, y);}}}UIProgressBar(false, blur);BuildTexture3D.SetPixels(color3d);BuildTexture3D.Apply();if (save)// 如果进行模糊,第一遍不用保存到硬盘{AssetDatabase.CreateAsset(BuildTexture3D, "Assets/My3DTexture.asset");DestroyImmediate(controlGameObject);Texture3DArray = null;BuildTexture3D = null;xRayCamera = null;controlGameObject = null;}}

Shader "Unlit/sliceBlurShader"
{Properties{_clearColor("ClearColor",Color) = (1,1,1,1)_VolumeTex("VolumeTex",3D) = "black"{}_offset("Offset", float) = 0_stepSize("StepSize",range(0,2)) = 1_transparency("Transparency",float) = 1_opacityCorrection ("OpacityCorrection",float) = 1}SubShader{Tags { "RenderType"="Transparent" }Pass{ZWrite OffBlend One OneMinusSrcAlphaCull OffCGPROGRAM#pragma vertex vert#pragma fragment frag#include "UnityCG.cginc"struct appdata{float4 vertex : POSITION;float2 uv : TEXCOORD0;};struct v2f{float2 uv : TEXCOORD0;float4 posW :  TEXCOORD1;float4 vertex : SV_POSITION;};Texture3D<float4> _VolumeTex;SamplerState  sampler_VolumeTex;float _offset;float _stepSize;float _opacityCorrection;float4 _clearColor;float _transparency;v2f vert (appdata v){v2f o;o.vertex = UnityObjectToClipPos(float4(v.vertex.xyz, 1.0));o.uv = v.uv;o.posW = mul(unity_ObjectToWorld, float4(v.vertex.xyz, 1.0));return o;}fixed4 frag(v2f i) : SV_Target{       float3 tex3DUvw = float3(i.posW.x,i.posW.y + _offset,i.posW.z );float colorSample = 0;float colAcc = 0;float dx = 0.5;//偏移UVfloat3 vTAR = float3(dx, dx, dx) * _stepSize;float3 vTAL = float3(dx, dx, -dx) * _stepSize;float3 vTPR = float3(dx, -dx, dx) * _stepSize;float3 vTPL = float3(dx, -dx, -dx) * _stepSize;float3 vBAR = float3(-dx, dx, dx) * _stepSize;float3 vBAL = float3(-dx, dx, -dx) * _stepSize;float3 vBPR = float3(-dx, -dx, dx) * _stepSize;float3 vBPL = float3(-dx, -dx, -dx) * _stepSize;//利用mipmap 代替downSamplefor (int mipLevel = 0; mipLevel <5; mipLevel++){colorSample += _VolumeTex.SampleLevel(sampler_VolumeTex, tex3DUvw + vTAR, mipLevel);colorSample += _VolumeTex.SampleLevel(sampler_VolumeTex, tex3DUvw + vTAL, mipLevel);colorSample += _VolumeTex.SampleLevel(sampler_VolumeTex, tex3DUvw + vTPR, mipLevel);colorSample += _VolumeTex.SampleLevel(sampler_VolumeTex, tex3DUvw + vTPL, mipLevel);colorSample += _VolumeTex.SampleLevel(sampler_VolumeTex, tex3DUvw + vBAR, mipLevel);colorSample += _VolumeTex.SampleLevel(sampler_VolumeTex, tex3DUvw + vBAL, mipLevel);colorSample += _VolumeTex.SampleLevel(sampler_VolumeTex, tex3DUvw + vBPR, mipLevel);colorSample += _VolumeTex.SampleLevel(sampler_VolumeTex, tex3DUvw + vBPL, mipLevel);colorSample *= 0.125;colAcc = (1.0 - colAcc.r) * colorSample + colAcc;}return saturate(pow(colAcc.r * _transparency, _opacityCorrection));}ENDCG}}
}

using UnityEngine;public class LoadTexture3D : MonoBehaviour
{public Material sliceMaterial;//使用模糊shader 创建一个材质球指引到这public int textureLength = 64;private MeshRenderer[] meshRenders;private GameObject gameObject;private GameObject planeObject;void Start(){meshRenders = new MeshRenderer[textureLength - 1];gameObject = GameObject.CreatePrimitive(PrimitiveType.Quad);gameObject.GetComponent<MeshRenderer>().sharedMaterial = sliceMaterial;gameObject.transform.position = transform.position;gameObject.transform.SetParent(transform);gameObject.transform.rotation = Quaternion.Euler(90, 0, 0);for (int i = 0; i < textureLength - 1; i++){Vector3 pos = new Vector3(transform.position.x, transform.position.y + i * (1f / textureLength) - 0.5f, transform.position.z );planeObject = Instantiate(gameObject);planeObject.transform.position = pos;planeObject.transform.SetParent(transform);meshRenders[i] = planeObject.GetComponent<MeshRenderer>();}sliceMaterial.SetFloat("_offset", 0);}}