Uinty3d 镜面反射代码

镜面反射代码

文件名MirrorReflection.cs

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using UnityEngine; using System.Collections;   // This is in fact just the Water script from Pro Standard Assets, // just with refraction stuff removed.   [ExecuteInEditMode] // Make mirror live-update even when not in play mode public class MirrorReflection : MonoBehaviour {      public bool m_DisablePixelLights = true;      public int m_TextureSize = 256;      public float m_ClipPlaneOffset = 0.07f;        public LayerMask m_ReflectLayers = -1;        private Hashtable m_ReflectionCameras = new Hashtable(); // Camera -> Camera table        private RenderTexture m_ReflectionTexture = null;      private int m_OldReflectionTextureSize = 0;        private static bool s_InsideRendering = false;        // This is called when it's known that the object will be rendered by some      // camera. We render reflections and do other updates here.      // Because the script executes in edit mode, reflections for the scene view      // camera will just work!      public void OnWillRenderObject()      {            if( !enabled || !renderer || !renderer.sharedMaterial || !renderer.enabled )                   return;              Camera cam = Camera.current;            if( !cam )                   return;              // Safeguard from recursive reflections.            if( s_InsideRendering )                   return;            s_InsideRendering = true;             Camera reflectionCamera;           CreateMirrorObjects( cam, out reflectionCamera );             // find out the reflection plane: position and normal in world space           Vector3 pos = transform.position;           Vector3 normal = transform.up;             // Optionally disable pixel lights for reflection           int oldPixelLightCount = QualitySettings.pixelLightCount;             if( m_DisablePixelLights )                  QualitySettings.pixelLightCount = 0;             UpdateCameraModes( cam, reflectionCamera );             // Render reflection           // Reflect camera around reflection plane           float d = -Vector3.Dot (normal, pos) - m_ClipPlaneOffset;           Vector4 reflectionPlane = new Vector4 (normal.x, normal.y, normal.z, d);             Matrix4x4 reflection = Matrix4x4.zero;           CalculateReflectionMatrix (ref reflection, reflectionPlane);           Vector3 oldpos = cam.transform.position;           Vector3 newpos = reflection.MultiplyPoint( oldpos );           reflectionCamera.worldToCameraMatrix = cam.worldToCameraMatrix * reflection;             // Setup oblique projection matrix so that near plane is our reflection           // plane. This way we clip everything below/above it for free.           Vector4 clipPlane = CameraSpacePlane( reflectionCamera, pos, normal, 1.0f );           Matrix4x4 projection = cam.projectionMatrix;           CalculateObliqueMatrix (ref projection, clipPlane);           reflectionCamera.projectionMatrix = projection;             reflectionCamera.cullingMask = ~(1<<4) & m_ReflectLayers.value; // never render water layer           reflectionCamera.targetTexture = m_ReflectionTexture;           GL.SetRevertBackfacing (true);           reflectionCamera.transform.position = newpos;           Vector3 euler = cam.transform.eulerAngles;           reflectionCamera.transform.eulerAngles = new Vector3(0, euler.y, euler.z);           reflectionCamera.Render();           reflectionCamera.transform.position = oldpos;           GL.SetRevertBackfacing (false);           Material[] materials = renderer.sharedMaterials;           foreach( Material mat in materials ) {                 if( mat.HasProperty("_ReflectionTex") )                         mat.SetTexture( "_ReflectionTex", m_ReflectionTexture );           }            // Set matrix on the shader that transforms UVs from object space into screen          // space. We want to just project reflection texture on screen.          Matrix4x4 scaleOffset = Matrix4x4.TRS(          new Vector3(0.5f,0.5f,0.5f), Quaternion.identity, new Vector3(0.5f,0.5f,0.5f) );          Vector3 scale = transform.lossyScale;          Matrix4x4 mtx = transform.localToWorldMatrix * Matrix4x4.Scale( new Vector3(1.0f/scale.x, 1.0f/scale.y, 1.0f/scale.z) );          mtx = scaleOffset * cam.projectionMatrix * cam.worldToCameraMatrix * mtx;          foreach( Material mat in materials ) {                mat.SetMatrix( "_ProjMatrix", mtx );          }            // Restore pixel light count          if( m_DisablePixelLights )                QualitySettings.pixelLightCount = oldPixelLightCount;            s_InsideRendering = false; }         // Cleanup all the objects we possibly have created     void OnDisable(){          if( m_ReflectionTexture ) {                DestroyImmediate( m_ReflectionTexture );                m_ReflectionTexture = null;          }          foreach( DictionaryEntry kvp in m_ReflectionCameras )          DestroyImmediate( ((Camera)kvp.Value).gameObject );          m_ReflectionCameras.Clear();     }         private void UpdateCameraModes( Camera src, Camera dest )     {          if( dest == null )                 return;          // set camera to clear the same way as current camera          dest.clearFlags = src.clearFlags;          dest.backgroundColor = src.backgroundColor;          if( src.clearFlags == CameraClearFlags.Skybox )          {                 Skybox sky = src.GetComponent(typeof(Skybox)) as Skybox;                 Skybox mysky = dest.GetComponent(typeof(Skybox)) as Skybox;                 if( !sky || !sky.material )                 {                       mysky.enabled = false;                 }                 else                {                      mysky.enabled = true;                      mysky.material = sky.material;                 }          }          // update other values to match current camera.          // even if we are supplying custom camera&projection matrices,          // some of values are used elsewhere (e.g. skybox uses far plane)          dest.farClipPlane = src.farClipPlane;          dest.nearClipPlane = src.nearClipPlane;          dest.orthographic = src.orthographic;          dest.fieldOfView = src.fieldOfView;          dest.aspect = src.aspect;          dest.orthographicSize = src.orthographicSize;      }        // On-demand create any objects we need      private void CreateMirrorObjects( Camera currentCamera, out Camera reflectionCamera )      {           reflectionCamera = null;             // Reflection render texture           if( !m_ReflectionTexture || m_OldReflectionTextureSize != m_TextureSize )           {                 if( m_ReflectionTexture )                      DestroyImmediate( m_ReflectionTexture );                 m_ReflectionTexture = new RenderTexture( m_TextureSize, m_TextureSize, 16 );                 m_ReflectionTexture.name = "__MirrorReflection" + GetInstanceID();                 m_ReflectionTexture.isPowerOfTwo = true;                 m_ReflectionTexture.hideFlags = HideFlags.DontSave;                 m_OldReflectionTextureSize = m_TextureSize;           }             // Camera for reflection           reflectionCamera = m_ReflectionCameras[currentCamera] as Camera;           if( !reflectionCamera ) // catch both not-in-dictionary and in-dictionary-but-deleted-GO          {                GameObject go = new GameObject( "Mirror Refl Camera id" + GetInstanceID() + " for " + currentCamera.GetInstanceID(), typeof(Camera), typeof(Skybox) );                reflectionCamera = go.camera;                reflectionCamera.enabled = false;                reflectionCamera.transform.position = transform.position;                reflectionCamera.transform.rotation = transform.rotation;                reflectionCamera.gameObject.AddComponent("FlareLayer");                go.hideFlags = HideFlags.HideAndDontSave;                m_ReflectionCameras[currentCamera] = reflectionCamera;           }      }        // Extended sign: returns -1, 0 or 1 based on sign of a      private static float sgn(float a)     {           if (a > 0.0f) return 1.0f;               if (a < 0.0f) return -1.0f;                    return 0.0f;     }       // Given position/normal of the plane, calculates plane in camera space.     private Vector4 CameraSpacePlane (Camera cam, Vector3 pos, Vector3 normal, float sideSign)     {           Vector3 offsetPos = pos + normal * m_ClipPlaneOffset;           Matrix4x4 m = cam.worldToCameraMatrix;           Vector3 cpos = m.MultiplyPoint( offsetPos );           Vector3 cnormal = m.MultiplyVector( normal ).normalized * sideSign;           return new Vector4( cnormal.x, cnormal.y, cnormal.z, -Vector3.Dot(cpos,cnormal) );     }       // Adjusts the given projection matrix so that near plane is the given clipPlane     // clipPlane is given in camera space. See article in Game Programming Gems 5.     private static void CalculateObliqueMatrix (ref Matrix4x4 projection, Vector4 clipPlane)     {           Vector4 q = projection.inverse * new Vector4(sgn(clipPlane.x),sgn(clipPlane.y),1.0f,1.0f );           Vector4 c = clipPlane * (2.0F / (Vector4.Dot (clipPlane, q)));           // third row = clip plane - fourth row           projection[2] = c.x - projection[3];           projection[6] = c.y - projection[7];           projection[10] = c.z - projection[11];           projection[14] = c.w - projection[15];     }       // Calculates reflection matrix around the given plane     private static void CalculateReflectionMatrix (ref Matrix4x4 reflectionMat, Vector4 plane)     {          reflectionMat.m00 = (1F - 2F*plane[0]*plane[0]);          reflectionMat.m01 = ( - 2F*plane[0]*plane[1]);          reflectionMat.m02 = ( - 2F*plane[0]*plane[2]);          reflectionMat.m03 = ( - 2F*plane[3]*plane[0]);            reflectionMat.m10 = ( - 2F*plane[1]*plane[0]);          reflectionMat.m11 = (1F - 2F*plane[1]*plane[1]);          reflectionMat.m12 = ( - 2F*plane[1]*plane[2]);          reflectionMat.m13 = ( - 2F*plane[3]*plane[1]);            reflectionMat.m20 = ( - 2F*plane[2]*plane[0]);          reflectionMat.m21 = ( - 2F*plane[2]*plane[1]);          reflectionMat.m22 = (1F - 2F*plane[2]*plane[2]);          reflectionMat.m23 = ( - 2F*plane[3]*plane[2]);            reflectionMat.m30 = 0F;          reflectionMat.m31 = 0F;          reflectionMat.m32 = 0F;          reflectionMat.m33 = 1F;     } }

文件名MirrorReflection.shader

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Shader "FX/Mirror Reflection" {       Properties {             _MainTex ("Base (RGB)", 2D) = "white" {}             _ReflectionTex ("Reflection", 2D) = "white" { TexGen ObjectLinear }       }         // two texture cards: full thing      Subshader {            Pass {                  SetTexture[_MainTex] { combine texture }                  SetTexture[_ReflectionTex] { matrix [_ProjMatrix] combine texture * previous }            }      }        // fallback: just main texture      Subshader {            Pass {                  SetTexture [_MainTex] { combine texture }            }      } }