QUAD_SURFACE_DISPLAY
Display a 3D Surface Defined by a Quadrilateral Mesh

QUAD_SURFACE_DISPLAY is a MATLAB program which can display a 3D surface that is defined by a mesh of quadrilaterals.

The input from the user includes:

• NODE_NUM, the number of nodes;
• NODE_XY(1:2,1:NODE_NUM), a list of the coordinates of nodes;
• QUAD_NODE(1:4,1:QUAD_NUM), a list of the nodes that make up each quadrilateral in the mesh;
• VALUE_XY(1:NODE_NUM), the value associated with each node;

Usage:

quad_surface_display ( node_num, node_xy, quad_num, quad_node, value )

• node_num, the number of nodes.
• node_xy, the coordinates of the nodes.
• quad_num, the number of quadrilaterals.
• quad_node, the nodes of each quadrilateral.
• value, the value assigned to each node.

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:

BALL_AND_STICK_DISPLAY, a MATLAB program which demonstrates the creation of a 3D "ball and stick" image;

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.

MPAS_GRID_DISPLAY, MATLAB programs which can read an MPAS NETCDF grid file and display the primary polygonal mesh or the dual triangular mesh.

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

PLY_DISPLAY, a MATLAB program which displays an image of a 3D graphics file in PLY format;

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

QUAD_SURFACE, a data directory which contains a description and examples of 3D surfaces defined by a quadrilateral mesh.

TET_MESH_DISPLAY, an 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 which carries out various operations on order 3 ("linear") or order 6 ("quadratic") triangulations.

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

TRIANGULATION_ORDER1_DISPLAY, a MATLAB program which reads files defining a piecewise constant triangulation of data, and displays a corresponding 3D surface.

TRIANGULATION_ORDER3_CONTOUR, a MATLAB library which can make 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 can make 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 can make plot the nodes and triangles that make up a finite element mesh.

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:

• quad_surface_display.m, displays a 3D plot of Z(X,Y) data associated with a quadrilateral mesh.

Examples and Tests:

QUAD_SURFACE_DISPLAY_TEST reads node, quadrilateral and value data from files, and calls QUAD_SURFACE_DISPLAY to plot it. Files you may copy include:

• quad_surface_display_test, the test code.
• node_xy.txt, the coordinates of the nodes.
• quad_node.txt, the indices of nodes that make the quadrilaterals.
• value_xy.txt, the value associated with each node.
• pool_depth.png, a PNG image of the MATLAB plot.

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