Instant Meshes is a free and open source automatic retopology tool, enabling you to quickly take your high resolution meshes and create low polygon versions with almost zero effort. It implements Instant Field-Aligned Meshes and is the realtime algorithm powering modern version of Modo.
Links
github.com/wjakob/instant-meshes
igl.ethz.ch/projects/instant-m...
www.gamefromscratch.com/post/...
2 ноя 2018