update taa readme

README.md

@@ -248,10 +248,38 @@ A ssao pass to add more realism to the scene. Use temporal accumulation to do de
 This pass calculates **direct lighting** and integrats it with **indirect and reflection** information that gathered from previous passes.  
 Information needed (material, world position, etc.) for Direct lighting was obtained and uncompressed/reconstructed from G-Buffer, then ray-query features was used to compute shading accordingly.
 
-|               Direct Lighting                |               Indirect Lighting                |                Reflection                |
-| :------------------------------------------: | :--------------------------------------------: | :--------------------------------------: |
-| ![](./docs/img/lightPass/directlighting.png) | ![](./docs/img/lightPass/indirectLighting.png) | ![](./docs/img/lightPass/reflection.png) |
+|                Combined                |               Direct Lighting                |               Indirect Lighting                |                Reflection                |
+| :------------------------------------: | :------------------------------------------: | :--------------------------------------------: | :--------------------------------------: |
+| ![](./docs/img/lightPass/combined.png) | ![](./docs/img/lightPass/directlighting.png) | ![](./docs/img/lightPass/indirectLighting.png) | ![](./docs/img/lightPass/reflection.png) |
 
 ### TAA Pass
 
+The TAA pass **jitters** the view frustum and strategically **averges** the color between multiple frames.
+
+Position Reconstruction: Reconstruct world position using depth buffer and screen uv.
+
+Previous Frame Reprojection: Using the view-projection matrix of last frame to calculate uv of world position of current pixel in last frame.
+
+|             Reprojection             |
+| :----------------------------------: |
+| ![](./docs/img/TAA/reprojection.png) |
+
+Neighbor Color Vector AABB: Sample the 3x3 neighbor color and adjacent neighbor color (surrounding pixels in "+" pattern), calculate aabb of color vector
+
+|              AABB              |
+| :----------------------------: |
+| ![](./docs/img/TAA/33plus.png) |
+
+Neighbor Color Clipping: clip the current color towards history color instead of just clamping it. In this way color from previous frame is trivially accepted to reduce ghost and smearing effect.
+
+|       Clamping and Clipping       |
+| :-------------------------------: |
+| ![](./docs/img/TAA/clampclip.png) |
+
+Blend and weigh history frames: Lerp between colors of past frame and this frame. Higher feedback factor will have a faster converge but will introduce artifacts.
+
+|             Blend             |
+| :---------------------------: |
+| ![](./docs/img/TAA/blend.png) |
+
 ### Tone Mapping Pass

src/main.cpp

@@ -61,10 +61,10 @@ int main(int argc, char **argv)
   InputParser parser(argc, argv);
 
   //std::string sceneFile   = parser.getString("-f", "Sponza/Sponza.gltf");
-   //std::string sceneFile = parser.getString("-f", "Street/scene.gltf");
-  std::string sceneFile = parser.getString("-f", "late_night_office.glb");
+   std::string sceneFile = parser.getString("-f", "Street/scene.gltf");
+  //std::string sceneFile = parser.getString("-f", "late_night_office.glb");
   //  std::string sceneFile = parser.getString("-f", "Hospital/scene.gltf");
-  // std::string sceneFile = parser.getString("-f", "station.glb");
+   //std::string sceneFile = parser.getString("-f", "station.glb");
   //std::string sceneFile = parser.getString("-f", "station/station_lowRough.glb");
   //std::string sceneFile = parser.getString("-f", "apocal/apocal.gltf");
    //std::string sceneFile = parser.getString("-f", "Street/scene.gltf");

src/sample_example.cpp

@@ -990,6 +990,25 @@ std::vector<vec2> SampleExample::hammersleySequence(int maxNumberPoints)
     std::mt19937 g(rd());
     std::shuffle(points.begin(), points.end(), g);
 
+    /*std::vector<vec2> points{
+    {0.500000f, 0.333333f},
+    {0.250000f, 0.666667f},
+    {0.750000f, 0.111111f},
+    {0.125000f, 0.444444f},
+    {0.625000f, 0.777778f},
+    {0.375000f, 0.222222f},
+    {0.875000f, 0.555556f},
+    {0.062500f, 0.888889f},
+    {0.562500f, 0.037037f},
+    {0.312500f, 0.370370f},
+    {0.812500f, 0.703704f},
+    {0.187500f, 0.148148f},
+    {0.687500f, 0.481481f},
+    {0.437500f, 0.814815f},
+    {0.937500f, 0.259259f},
+    {0.031250f, 0.592593f}
+    };*/
+
 	return points;
 }