This is a demo of a procedural modeling project I worked on in Houdini, featuring the use of circular arcs. We have a look at custom ways to create arcs, using vex code, and their integration into various use-cases. Useful links: Some of my other videos: The closest point between two rays whitepaper: %20closest% Sidefx homepage: Chapters: 00:00 1 - Intro 01:00 2 - The Idea 01:19 3 - The Prerequisites 01:52 4 - Finding the Center 02:23 5 - First Simple Example 03:00 6 - Second Basic Example 03:52 7 - Example 3, expanding on the idea 04:51 8 - Example 4 - Gothic Style Ribbed Vault 06:17 9 - The Road Project - Start 06:52 10 - Curve topology issues 07:31 11 - The Road Project Custom Arc Tool 08:32 12 - The logic of how the custom road tool works 10:13 13 - Curve banking and flaring 10:52 14 - Road integration into height fields 11:55 15 - Imprinting the road on our height field - the steps 13:12 16 - Our solution is interactive 13:58 17 - Outro