Menu: Files->Import->Vtk voxels...
GiD can import a mesh from a file with Vtk structured data point format (http://www.vtk.org/pdf/file-formats.pdf). This format represent a scalar field over a rectilinear 3D grid.
In the "Vtk voxels read" dialog box we can specify the isosurface value for the boundary of the body we want to extract from the volume. Besides we can choose among 3 different methods:
- Marching cube: the well known method
for isosurface extraction is applied an the result is a triangle mesh on the boundary of the body. marching cube
- Uniform Hexahedra: an uniform mesh of hexahedra fited to the boundary is generated applying a dual
. contour method
- Orthogonal Hexahedra: an orthogonal mesh of cubes is extracted from the volume selecting all the voxels withing the body bounded by the isosurface value.