Procedural River Bed Tool

On Lays of Althas Sundered Order we wanted to find a way to procedurally create riverbeds in the Kingdom of Thenodar. These had originally been placed by hand in the old heightmap, but after running the heightmap through Gaea the riverbeds were eroded away entirely. Rather than placing them by hand again, I decided to build a workflow in Houdini to procedurally generate riverbeds based on an input spline. This workflow follows The Horizon Zero Dawn process by Ben Schrijvers as detailed here: https://vimeo.com/216727778 Heightmap work and landscape shader by Kevin Eriksen