Inigo Quilez | The SDF of a Line Segment @InigoQuilez | Uploaded 4 years ago | Updated 2 hours ago
How to derive formula of the SDF of a Line Segment, a common shape in procedural modeling.
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Tutorials on maths , art, SDFs and computer graphics: http://iquilezles.org. The article that includes information about the Elongation operator is here (half way down the article): iquilezles.org/articles/distfunctions

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0:00 Introduction
0:32 Math derivation
5:38 Implementation
6:12 Interpretation as Elongation
6:53 End