Open-source alternatives to Extrude

libigl is a C++ geometry processing library used for analyzing and manipulating 3D triangle and tetrahedral meshes. It functions as a numerical linear algebra suite and a mesh manipulation framework, integrating a geometric deformation engine to implement rigid and polyharmonic transformations. The project is distinguished by its header-only library design and its implementation of specialized deformation techniques, including rigid-as-possible and polyharmonic shape deformation. It also provides a visualization tool for rendering surfaces and scalar fields with interactive scene controls and

GeometronLib - Basic Geometry Library for 2D/3D Apps in modern C++

A generic programming header only C++ library for processing polygonal and polyhedral meshes

Bunch of credits must go to David for inventing such beautiful algorithm (Newton Apple Wrapper):

The Polygon Mesh Processing Library is a modern C++ open-source library for processing and visualizing polygon surface meshes. Its main features are:

RecastNavigation is a navigation mesh toolset and game AI pathfinding library used to generate and query walkable surfaces in 3D environments. It functions as a runtime navigation mesh generator and spatial query library, transforming raw 3D geometry into simplified surfaces to enable AI movement. The project includes a crowd simulation engine that manages steering and collision avoidance for large numbers of agents. It provides capabilities for group movement coordination and the simulation of many agents simultaneously using scalable navigation techniques. The system covers mesh generation

A really fast C++ library for Delaunay triangulation of 2D points.

This project implements the seam-aware decimation portion of our SIGGRAPH Asia 2017 paper Seamless: Seam erasure and seam-aware decoupling of shape from mesh resolution. Seam-aware decimater simplifies a mesh while preserving its UV's boundary. It allows the same texture to be used across all…

When graphics programmers face the problem of creating a mesh for a sphere, trade-offs must be made between quality and construction, memory and rendering costs. This document introduces four different methods and analyzes their characteristics and compares them allowing programmers to make an…

meshoptimizer is a 3D mesh optimization library designed to compress geometry and animation data, reduce memory usage, and improve rendering performance. It functions as a geometry simplification tool, a mesh compression codec, and a utility for preparing data for mesh shaders and raytracing acceleration. The library provides specialized toolsets for partitioning meshes into clusters and meshlets to optimize hardware-accelerated rendering pipelines. It also includes helpers for generating opacity micromaps and spatial clusters to increase the speed of hardware ray-triangle intersection tests.