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@@ -1,5 +1,35 @@
 # lab02-debugging
 
+Name:
+
+Tianhong Zhou
+
+Link:
+
+[ShaderToy](https://www.shadertoy.com/view/wcfBWl)
+
+Bug:
+
+1. vec uv2 = 2.0 * uv - vec2(1.0); -> vec2 uv2 = 2.0 * uv - vec2(1.0);
+
+   There is a warning.
+
+2. raycast(uv, dir, eye, ref); -> raycast(uv2, dir, eye, ref);
+   
+   Before change this bug, it only shows 1/4 of the full scene, so it must be related to uv.
+
+3. H *= len * iResolution.x / iResolution.y; -> H *= len * iResolution.x / iResolution.x;
+   
+   Spheres become ellipsoids, must be some ratio error.
+
+4. dir = reflect(eye, nor); -> dir = reflect(dir, nor);
+   
+   Unable to see reflection, must be related to reflection part.
+   
+5. for(int i = 0; i < 64; ++i) -> for(int i = 0; i < 256; ++i)
+
+   Unable to see the full floor, must be realted to raymarching distance.
+
 # Setup 
 
 Create a [Shadertoy account](https://www.shadertoy.com/). Either fork this shadertoy, or create a new shadertoy and copy the code from the [Debugging Puzzle](https://www.shadertoy.com/view/flGfRc).