TRIANGULATION_ORDER1_DISPLAY
Plot Triangulated Piecewise Constant Data

TRIANGULATION_ORDER1_DISPLAY is a MATLAB program which can make a 3D plot of piecewise constant data defined on a triangulation.

The input from the user includes:

NODE_XY(1:2,1:NODE_NUM), a list of the coordinates of nodes;
TRIANGLE_NODE(1:3,1:TRIANGLE_NUM), a list of the nodes that make up each triangle in the triangulation;
VALUE(1:TRIANGLE_NUM), the value associated with each triangle;

Usage:

triangulation_order1_display ( 'prefix' )

where 'prefix' is the common file prefix:

'prefix'_nodes.txt, lists the node coordinates;
'prefix'_elements.txt lists the indices of nodes that form elements.
'prefix'_values.txt lists the value to be assigned each triangle.

reads the data and makes a plot.

Licensing:

The computer code and data files described and made available on this web page are distributed under the GNU LGPL license.

Related Data and Programs:

BEZIER_SURFACE_DISPLAY, a MATLAB program which reads two files defining a Bezier surface and displays it within MATLAB.

MESH_DISPLAY, a MATLAB program which reads data defining a polygonal mesh and displays it, with optional numbering.

OBJ_DISPLAY, a MATLAB program which reads an OBJ file defining a 3D object and displays it within MATLAB.

POLYGONAL_SURFACE_DISPLAY, a MATLAB program which reads two files defining a polygonal surface and displays it within MATLAB.

QUAD_SURFACE_DISPLAY, a MATLAB program which reads files defining a 3D quadrilateral mesh surface and displays it within MATLAB.

STLA_DISPLAY, a MATLAB program which reads an ASCII STL file defining a 3D object and displays it within MATLAB.

TET_MESH_DISPLAY, a MATLAB program which reads files defining a tet mesh and displays an image within MATLAB.

TRI_SURFACE_DISPLAY, a MATLAB program which reads data defining a triangular mesh of a 3D surface and displays it.

TRIANGULATION, a MATLAB library of routines for carrying out various operations on order 3 ("linear") or order 6 ("quadratic") triangulations.

TRIANGULATION_CORNER, a MATLAB program which patches triangulations so that no triangle has two sides on the boundary.

TRIANGULATION_DELAUNAY_DISCREPANCY, a MATLAB program which measures the amount by which a triangulation fails the local Delaunay test;

TRIANGULATION_HISTOGRAM, a MATLAB program which computes histograms of data over a triangulation.

TRIANGULATION_MASK, a MATLAB program which takes an existing triangulation and deletes triangles and their corresponding nodes as requested by the user.

TRIANGULATION_ORDER3_CONTOUR, a MATLAB library which makes a contour plot of a scalar quantity that is defined on a finite element mesh of three-node triangles.

TRIANGULATION_ORDER6_CONTOUR, a MATLAB library which makes a contour plot of a scalar quantity that is defined on a finite element mesh of six-node triangles.

TRIANGULATION_ORIENT, a MATLAB program that reads data defining a triangulation, makes sure that every triangle has positive orientation, and if not, writes a corrected triangle file.

TRIANGULATION_PLOT, a MATLAB library which plots the nodes and triangles that make up a finite element mesh.

TRIANGULATION_QUAD, a MATLAB program which estimates the integral of a function over a triangulated region.

TRIANGULATION_REFINE, a MATLAB program which reads data defining a triangulation, replaces each triangle by four congruent smaller ones, and writes the new triangulation information to a file.

Source Code:

triangulation_order1_display.m, displays a 3D plot of piecewise data on a triangulation.

Examples and Tests:

EXAMPLE1 is a set of node, triangle and value data. Files you may copy include:

example1_nodes.txt, the coordinates of the nodes.
example1_elements.txt, the indices of nodes that make the triangles.
example1_values.txt, the value associated with each triangle.
example1.png, a PNG image of the MATLAB plot.

EXAMPLE2 is a set of node, triangle and value data. Files you may copy include:

example2_nodes.txt, the coordinates of the nodes.
example2_elements.txt, the indices of nodes that make the triangles.
example2_values.txt, the value associated with each triangle.
example2.png, a PNG image of the MATLAB plot.

You can go up one level to the MATLAB source codes.