## CGAL: Area of Parallelogram And Volume Of Triple Vectors

We can get the third vector by cross product of two vectors, the new vector is perpendicular to the first vectors. We also know the geometry meaning of the determinant, it’s sign volumn value for three vectors.

## Find Closest Line Between Points In 2D By Least Squares

Let’s create a few random points and use algorithm library CGAL and the visualization toolkit (VTK) to find and draw the closest line by a demo.

## CGAL: Useful Properties Of Matrix

We defined three different matrix A(m x n), B(n x r), and C(n x r), they satisfy distributivity of multiplication over addtion: A(B+C) = AB + AC.

## Simple Demos About Using CGAL

Here are simple demos show how to use CGAL, the Computational Geometry Algorithms Library. I use cmake to manage these small projects.

## Surface Reconstruction By VTK And CGAL

Use vtkSurfaceReconstructionFilter to get mesh from the point coordinates.
I use the advancing front surface reconstruction way to get the mesh from point cloud information.

3D Files Converter: Support to write X3D file and VRML file.

X
A prohibited operation