Raymarching and SDFs

A list of signed distance functions

In this shadertoy the epsilon used to calculate the normals is 5 times bigger than min_dist to SDF to stop raymarching (1e-4 and 5e-4).

• Raymarching visualizer

• Ray Marching for Dummies video
• Inigo Quilez YouTube channel

• Calculating normals in Raymarching

• SDF subtraction doesn’t return the real distance to the resulting object. As well as max function in general. See this. If the object being subtracted is fully inside another object, then the distance is correct. Also see this shadertoy by IQ and the article.
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• Raytracing