This project presents a Rust code to generate triangle and tetrahedron meshes by calling Triangle and Tetgen (1.4).
A critical aspect of this crate is that all the data structures accessed by the C-code are allocated on the "C-side" by (carefully) using "malloc/new." 😅 We then make use of Valgrind and tests to make sure that all is (hopefully) well.
The code should work fine in multithreaded applications (not exhaustively verified, though!). See, for example, the comprehensive tests in memchecktrianglebuild.rs and memchecktetgenbuild.rs
The resulting Rust interface to Triangle and Tetgen is a lightweight, low-level set of functions. However, other projects could use this interface to make higher-level functions.
For example, this crate is used by Gemlab: Geometry, meshes, and numerical integration for finite element analyses.
Tritet documentation on docs.rs
Install some libraries:
bash
sudo apt install build-essential
👆 Check the crate version and update your Cargo.toml accordingly:
toml
[dependencies]
tritet = "*"
Note: set SAVE_FIGURE to true to generate the figures.
```rust use plotpy::Plot; use tritet::{StrError, Triangle};
const SAVE_FIGURE: bool = false;
fn main() -> Result<(), StrError> { // allocate data for 10 points let mut triangle = Triangle::new(10, None, None, None)?;
// set points
triangle
.set_point(0, 0.478554, 0.00869692)?
.set_point(1, 0.13928, 0.180603)?
.set_point(2, 0.578587, 0.760349)?
.set_point(3, 0.903726, 0.975904)?
.set_point(4, 0.0980015, 0.981755)?
.set_point(5, 0.133721, 0.348832)?
.set_point(6, 0.648071, 0.369534)?
.set_point(7, 0.230951, 0.558482)?
.set_point(8, 0.0307942, 0.459123)?
.set_point(9, 0.540745, 0.331184)?;
// generate Delaunay triangulation
triangle.generate_delaunay(false)?;
// draw triangles
if SAVE_FIGURE {
let mut plot = Plot::new();
triangle.draw_triangles(&mut plot, true, true, true, true, None, None, None);
plot.set_equal_axes(true)
.set_figure_size_points(600.0, 600.0)
.save("/tmp/tritet/doc_triangle_delaunay_1.svg")?;
}
Ok(())
} ```
```rust use plotpy::Plot; use tritet::{StrError, Triangle};
const SAVE_FIGURE: bool = false;
fn main() -> Result<(), StrError> { // allocate data for 10 points let mut triangle = Triangle::new(10, None, None, None)?;
// set points
triangle
.set_point(0, 0.478554, 0.00869692)?
.set_point(1, 0.13928, 0.180603)?
.set_point(2, 0.578587, 0.760349)?
.set_point(3, 0.903726, 0.975904)?
.set_point(4, 0.0980015, 0.981755)?
.set_point(5, 0.133721, 0.348832)?
.set_point(6, 0.648071, 0.369534)?
.set_point(7, 0.230951, 0.558482)?
.set_point(8, 0.0307942, 0.459123)?
.set_point(9, 0.540745, 0.331184)?;
// generate Voronoi tessellation
triangle.generate_voronoi(false)?;
// draw Voronoi diagram
if SAVE_FIGURE {
let mut plot = Plot::new();
triangle.draw_voronoi(&mut plot);
plot.set_equal_axes(true)
.set_figure_size_points(600.0, 600.0)
.save("/tmp/tritet/doc_triangle_voronoi_1.svg")?;
}
Ok(())
} ```
```rust use plotpy::Plot; use tritet::{StrError, Triangle};
const SAVE_FIGURE: bool = false;
fn main() -> Result<(), StrError> { // allocate data for 12 points, 10 segments, 2 regions, and 1 hole let mut triangle = Triangle::new(12, Some(10), Some(2), Some(1))?;
// set points
triangle
.set_point(0, 0.0, 0.0)?
.set_point(1, 1.0, 0.0)?
.set_point(2, 1.0, 1.0)?
.set_point(3, 0.0, 1.0)?
.set_point(4, 0.2, 0.2)?
.set_point(5, 0.8, 0.2)?
.set_point(6, 0.8, 0.8)?
.set_point(7, 0.2, 0.8)?
.set_point(8, 0.0, 0.5)?
.set_point(9, 0.2, 0.5)?
.set_point(10, 0.8, 0.5)?
.set_point(11, 1.0, 0.5)?;
// set segments
triangle
.set_segment(0, 0, 1)?
.set_segment(1, 1, 2)?
.set_segment(2, 2, 3)?
.set_segment(3, 3, 0)?
.set_segment(4, 4, 5)?
.set_segment(5, 5, 6)?
.set_segment(6, 6, 7)?
.set_segment(7, 7, 4)?
.set_segment(8, 8, 9)?
.set_segment(9, 10, 11)?;
// set regions
triangle
.set_region(0, 0.1, 0.1, 1, None)?
.set_region(1, 0.1, 0.9, 2, None)?;
// set holes
triangle.set_hole(0, 0.5, 0.5)?;
// generate o2 mesh without constraints
triangle.generate_mesh(false, true, None, None)?;
assert_eq!(triangle.ntriangle(), 14);
// draw mesh
if SAVE_FIGURE {
let mut plot = Plot::new();
triangle.draw_triangles(&mut plot, true, true, true, true, None, None, None);
plot.set_equal_axes(true)
.set_figure_size_points(600.0, 600.0)
.save("/tmp/tritet/doc_triangle_mesh_1.svg")?;
}
Ok(())
} ```
```rust use plotpy::Plot; use tritet::{StrError, Tetgen};
const SAVE_FIGURE: bool = false;
fn main() -> Result<(), StrError> { // allocate data for 8 points let mut tetgen = Tetgen::new(8, None, None, None)?;
// set points
tetgen
.set_point(0, 0.0, 0.0, 0.0)?
.set_point(1, 1.0, 0.0, 0.0)?
.set_point(2, 1.0, 1.0, 0.0)?
.set_point(3, 0.0, 1.0, 0.0)?
.set_point(4, 0.0, 0.0, 1.0)?
.set_point(5, 1.0, 0.0, 1.0)?
.set_point(6, 1.0, 1.0, 1.0)?
.set_point(7, 0.0, 1.0, 1.0)?;
// generate Delaunay triangulation
tetgen.generate_delaunay(false)?;
// draw edges of tetrahedra
if SAVE_FIGURE {
let mut plot = Plot::new();
tetgen.draw_wireframe(&mut plot, true, true, true, true, None, None, None);
plot.set_equal_axes(true)
.set_figure_size_points(600.0, 600.0)
.save("/tmp/tritet/example_tetgen_delaunay_1.svg")?;
}
Ok(())
} ```
Note: set SAVE_VTU_FILE to true to generate Paraview file.
```rust use plotpy::Plot; use tritet::{writetetvtu, StrError, Tetgen};
const SAVEVTUFILE: bool = false; const SAVE_FIGURE: bool = false;
fn main() -> Result<(), StrError> { // allocate data for 16 points and 12 facets // (one cube/hole inside another cube) let mut tetgen = Tetgen::new( 16, Some(vec![ 4, 4, 4, 4, 4, 4, // inner cube 4, 4, 4, 4, 4, 4, // outer cube ]), Some(1), Some(1), )?;
// inner cube
tetgen
.set_point(0, 0.0, 0.0, 0.0)?
.set_point(1, 1.0, 0.0, 0.0)?
.set_point(2, 1.0, 1.0, 0.0)?
.set_point(3, 0.0, 1.0, 0.0)?
.set_point(4, 0.0, 0.0, 1.0)?
.set_point(5, 1.0, 0.0, 1.0)?
.set_point(6, 1.0, 1.0, 1.0)?
.set_point(7, 0.0, 1.0, 1.0)?;
// outer cube
tetgen
.set_point(8, -1.0, -1.0, -1.0)?
.set_point(9, 2.0, -1.0, -1.0)?
.set_point(10, 2.0, 2.0, -1.0)?
.set_point(11, -1.0, 2.0, -1.0)?
.set_point(12, -1.0, -1.0, 2.0)?
.set_point(13, 2.0, -1.0, 2.0)?
.set_point(14, 2.0, 2.0, 2.0)?
.set_point(15, -1.0, 2.0, 2.0)?;
// inner cube
tetgen
.set_facet_point(0, 0, 0)?
.set_facet_point(0, 1, 4)?
.set_facet_point(0, 2, 7)?
.set_facet_point(0, 3, 3)?;
tetgen
.set_facet_point(1, 0, 1)?
.set_facet_point(1, 1, 2)?
.set_facet_point(1, 2, 6)?
.set_facet_point(1, 3, 5)?;
tetgen
.set_facet_point(2, 0, 0)?
.set_facet_point(2, 1, 1)?
.set_facet_point(2, 2, 5)?
.set_facet_point(2, 3, 4)?;
tetgen
.set_facet_point(3, 0, 2)?
.set_facet_point(3, 1, 3)?
.set_facet_point(3, 2, 7)?
.set_facet_point(3, 3, 6)?;
tetgen
.set_facet_point(4, 0, 0)?
.set_facet_point(4, 1, 3)?
.set_facet_point(4, 2, 2)?
.set_facet_point(4, 3, 1)?;
tetgen
.set_facet_point(5, 0, 4)?
.set_facet_point(5, 1, 5)?
.set_facet_point(5, 2, 6)?
.set_facet_point(5, 3, 7)?;
// outer cube
tetgen
.set_facet_point(6, 0, 8 + 0)?
.set_facet_point(6, 1, 8 + 4)?
.set_facet_point(6, 2, 8 + 7)?
.set_facet_point(6, 3, 8 + 3)?;
tetgen
.set_facet_point(7, 0, 8 + 1)?
.set_facet_point(7, 1, 8 + 2)?
.set_facet_point(7, 2, 8 + 6)?
.set_facet_point(7, 3, 8 + 5)?;
tetgen
.set_facet_point(8, 0, 8 + 0)?
.set_facet_point(8, 1, 8 + 1)?
.set_facet_point(8, 2, 8 + 5)?
.set_facet_point(8, 3, 8 + 4)?;
tetgen
.set_facet_point(9, 0, 8 + 2)?
.set_facet_point(9, 1, 8 + 3)?
.set_facet_point(9, 2, 8 + 7)?
.set_facet_point(9, 3, 8 + 6)?;
tetgen
.set_facet_point(10, 0, 8 + 0)?
.set_facet_point(10, 1, 8 + 3)?
.set_facet_point(10, 2, 8 + 2)?
.set_facet_point(10, 3, 8 + 1)?;
tetgen
.set_facet_point(11, 0, 8 + 4)?
.set_facet_point(11, 1, 8 + 5)?
.set_facet_point(11, 2, 8 + 6)?
.set_facet_point(11, 3, 8 + 7)?;
// set region and hole
tetgen.set_region(0, -0.9, -0.9, -0.9, 1, None)?;
tetgen.set_hole(0, 0.5, 0.5, 0.5)?;
// generate mesh
tetgen.generate_mesh(false, false, None, None)?;
// generate file for Paraview
if SAVE_VTU_FILE {
write_tet_vtu(&tetgen, "/tmp/tritet/example_tetgen_mesh_1.vtu")?;
}
// draw edges of tetrahedra
if SAVE_FIGURE {
let mut plot = Plot::new();
tetgen.draw_wireframe(&mut plot, true, true, true, true, None, None, None);
plot.set_equal_axes(true)
.set_figure_size_points(600.0, 600.0)
.save("/tmp/tritet/example_tetgen_mesh_1.svg")?;
}
Ok(())
} ```
