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Lab 2: Kevin Du #9

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kevinwd2401 Sep 17, 2025
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# lab02-debugging

https://www.shadertoy.com/view/tfsBDf

Syntax error: vec doesn't exist, should be vec2

Camera error: The line H *= len * iResolution.x / iResolution.x incorrectly calculates horizontal camera vector, causing image to stretch along x

Raycast bug: UV used to create camera rays is uv (0 to 1) instead of uv2 (-1 to 1), UV should be from -1 to 1, 0 to 1 only calculates rays in one camera quadrant

Raymarch for loop: requires more iterations to hit the floor behind the spheres, since raymarch steps are smaller when the ray is closer to sphere

Reflect error: dir = reflect(eye, nor) wrongly reflects the eye position instead of the ray direction when calculating reflection


# 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).
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