update readme

README.md

@@ -11,29 +11,22 @@ Create a [Shadertoy account](https://www.shadertoy.com/). Either fork this shade
 https://www.shadertoy.com/view/M3fcD2
 
 
+<p align="center">
+  <img src="https://github.com/yiliu1237/lab02-debugging/shader_result.gif?raw=true"/>
+</p>
 
 
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-# Bug1: Syntax Error 
+## Bug1: Syntax Error 
 - Issue: The variable uv2 was declared as vec instead of vec2.
 - Fix: Change the type of uv2 to vec2.
 - How It Was Found: The Shadertoy editor highlighted this as a syntax error upon running the shader.
 
-# Bug2 Incorrect Input to raycast Function
+## Bug2 Incorrect Input to raycast Function
 - Issue: The uv variable was incorrectly used when calling the raycast function.
 - Fix: Use uv2 instead of uv when calling raycast to ensure proper coordinates are passed.
 - How It Was Found: The rendered output was distorted, leading to inspection of how coordinates were handled.
 
-# Bug3: Reflection Calculation Error
+## Bug3: Reflection Calculation Error
 - Issue: The reflection was not computed correctly due to the misuse of the reflect function.
 - Fix: Update the reflect function call to use the correct vector inputs:
 
@@ -43,7 +36,7 @@ dir = reflect(dir, nor);
 
 - How It Was Found: The reflection on objects appeared incorrect, leading a deeper look into the reflection calculation. 
 
-# Bug4: Scene Aspect Ratio Distortion
+## Bug4: Scene Aspect Ratio Distortion
 - Issue: The rendered scene was stretched along the x-axis, showing ellipsoids instead of spheres.
 - Fix: Adjust the scene's aspect ratio to prevent distortion.
 
@@ -55,7 +48,7 @@ uv2.x /= iResolution.y;
 - How It Was Found: Comparing the reference Shadertoy to the current output revealed the ratio issue.
 
 
-# Bug5: Insufficient Iterations in march Function
+## Bug5: Insufficient Iterations in march Function
 - Issue: The march function was not iterating through enough steps, causing the scene to render incorrectly.
 - Fix: Increase the number of iterations in the march function to allow sufficient steps for ray marching: