add vcglib

vcglib/README.md

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+The **_Visualization and Computer Graphics Library_** (VCGlib for short) is an open source, portable, and templated library written in C++, with no external dependencies, for manipulation, processing, cleaning, and simplifying triangle meshes.
+
+[![BuildExamples](https://github.com/cnr-isti-vclab/vcglib/actions/workflows/BuildExamples.yml/badge.svg)](https://github.com/cnr-isti-vclab/vcglib/actions/workflows/BuildExamples.yml)
+
+The library, composed by more than 100k lines of code, is released under the GPL license, and it is the base of most of the software tools of the [Visual Computing Lab](http://vcg.isti.cnr.it) of the Italian National Research Council Institute - ISTI, like [MeshLab](http://www.meshlab.net/), [Metro](http://vcg.isti.cnr.it/vcglib/metro.html) and many others.
+
+The VCG library is tailored to mostly manage triangular meshes: The library is fairly large and offers many state-of-the-art capabilities for processing meshes, such as:
+
+- high quality quadric-error edge-collapse based simplfication
+- efficient spatial query structures (uniform grids, hashed grids, kdtree, etc)
+- advanced smoothing and fairing algorithms
+- computation of curvature
+- optimization of texture coordinates
+- Hausdorff distance computation
+- geodesic paths
+- mesh repairing capabilities
+- isosurface extraction and advancing front meshing algorithms
+- Poisson Disk sampling and other tools to sample point distributions over meshes
+- subdivision surfaces
+
+## Notable Applications
+
+A number of applications have been developed using the VCGlib:
+
+- MeshLab: the renowed open source mesh processing software
+- Metro, the tool for measuring differences between meshes
+- The first high quality out-of-core mesh simplifier that was used by the Stanford Digital Michelangelo project to process their huge 3D scanned models.
+
+## Contacts
+
+For any info about licensing (portions of) the library please contact us:
+Paolo Cignoni (p.cignoni@isti.cnr.it)
+Visual Computing Lab of the Italian National Research Council - ISTI
+
+In case of bugs please report them [here](https://github.com/cnr-isti-vclab/vcglib/issues).