fr.cnes.sirius.patrius.bodies.mesh

Class GeodeticMeshLoader

java.lang.Object

fr.cnes.sirius.patrius.bodies.mesh.GeodeticMeshLoader

All Implemented Interfaces:

MeshProvider, Serializable

public class GeodeticMeshLoader
extends Object
implements MeshProvider

Loader for mesh defined by geodetic coordinates. This reader assumes the mesh is defined by coronas with a north pole and a south pole.

The file format is column text file following format for each line: [latitude (deg) longitude (deg) altitude (m)].

Example:
-90.0000 0.0000 8.3726
-90.0000 2.0000 8.3726
-90.0000 4.0000 8.3726
...

Note about the convention used by loaded files: they follow the cartographic convention meaning that, in the case of Phobos or Deimos for instance, longitudes are increasing toward West (from +X_body to -Y_body). This convention is used by NASA and is recommended by the IAU working group (Report of the IAU Working Group on Cartographic Coordinates and Rotational Elements: 2009): "Thus, west longitudes (i.e., longitudes measured positively to the west) will be used when the rotation is direct, i.e. the sign of the second term in the expression for W is positive. East longitudes (i.e., longitudes measured positively to the east) will be used when the rotation is retrograde, i.e. the sign of the second term in the expression for W is negative. The origin is the center of mass. Also because of tradition, the Earth, Sun, and Moon do not conform with this definition. Their rotations are direct and longitudes run both east and west 180°, or east 360°"
Once a body is loaded and instantiated as a FacetBodyShape its longitudes follow the more intuitive mathematical convention. In this case, longitudes are increasing counter-clockwise toward East (from +X_body to +Y_body).

Since:

4.6

Author:

Emmanuel Bignon

See Also:

Serialized Form

Constructor Summary

Constructors

Constructor and Description
GeodeticMeshLoader(String modelFileName) Constructor.

Method Summary

Modifier and Type	Method and Description
Triangle[]	getTriangles() Returns the list of triangles of the mesh.
Map<Integer,Vertex>	getVertices() Returns the list of vertices of the mesh.
void	toObjFile(String fileName) Convert file to .obj file format.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

GeodeticMeshLoader

public GeodeticMeshLoader(String modelFileName)
                   throws PatriusException

Constructor.

Parameters:

modelFileName - mesh model .tab file name

Throws:

PatriusException - thrown if loading failed

Method Detail

getTriangles

public Triangle[] getTriangles()

Returns the list of triangles of the mesh.

Specified by:

getTriangles in interface MeshProvider

Returns:

list of triangles of the mesh

toObjFile

public void toObjFile(String fileName)
               throws PatriusException

Convert file to .obj file format.

Parameters:

fileName - Output file name

Throws:

PatriusException - if writing failed

getVertices

public Map<Integer,Vertex> getVertices()

Returns the list of vertices of the mesh.

Specified by:

getVertices in interface MeshProvider

Returns:

list of vertices of the mesh