We are pleased to announce version 3.0 of the Polygon Mesh Processing Library! This is a major release with several additions and API changes. Highlights include: We integrated a polygon Laplacian that enables several algorithms to work on general polygon meshes, including smoothing, parameterization, fairing, and curvature computation. The geodesics in heat method has been added. The algorithms API has been revamped to use a simple function-based interface. New interactive online demos integrated into the algorithms guide. We no longer use git submodules for handling third-party dependencies. Upgrade C++ standard to C++17 ... a whole lot of smaller fixes, cleanups, and improvements See the changelog for a full summary of changes.