New Version 1.6

New 125 balls & powerups.
Improved graphics.

Gutterball 3/Assets/MirrorReflection/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 || !GetComponent<Renderer>() || !GetComponent<Renderer>().sharedMaterial || !GetComponent<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 = GetComponent<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.GetComponent<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;
+    }
+}