rlaramee
Class MarchingCubesCases

java.lang.Object
  |
  +--rlaramee.MarchingCubesCases

public class MarchingCubesCases

extends java.lang.Object

Description: Marching Cubes Cases is a case table for generating isosurfaces. The marching cubes algorithm assumes that a contour can only pass through a cell in a finite number of ways. A case table is constructed enumerates all possible topoligical states of a cell, given combinations of scalar values at the cell points. The number of topological states depends on the number of cell vertices, and the number of inside/outside relationships a vertex can have with respect to the contour value. A vertex is considered inside[outside] a contour if its scalar value is larger[smaller] than the scalar value of the contour line. There are 256 different combinations of scalar value, given that there are eight points in a cubical cell [i.e., 2 exp(8) combinations]. For more information refer to page 147 of The Visualization Toolkit.

start date Sat 01 May 1999

Version:

1.0

Author:

Robert S Laramee

See Also:

MarchingCubes

Field Summary

(package private) static byte[][]

triangleCases "Edges to intersect.

Constructor Summary

MarchingCubesCases()

Method Summary

static byte[]

getEdges(short index) Returns a set of cube edges

Methods inherited from class java.lang.Object

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

Field Detail

triangleCases

static byte[][] triangleCases

"Edges to intersect. Three at a time form a triangle." Each of these unit-less numbers identifies an edge e.g. 0 means edge 0 The edges come in sets of three because we are generating triangles.

 Here's a edge to vertex pair mapping:
  Edge          Vertex Pair
  ----          -----------
   0             0,1
   1             1,2
   2             2,3
   3             3,0
   4             4,5
   5             5,6
   6             6,7
   7             7,4
   8             0,4
   9             1,5
  10             3,7
  11             2,6
 

Constructor Detail

MarchingCubesCases

public MarchingCubesCases()

Method Detail

getEdges

public static byte[] getEdges(short index)

Returns a set of cube edges

Parameters:

index - an index into the case table

Returns:

edges -a list of cube edges