jwo.landserf.gui3d
Class SurfNormals

java.lang.Object
  jwo.landserf.gui3d.SurfNormals

public class SurfNormals
extends Object

Calculates the surface normals of a gridded array. Adapted from Appendix F in the OpenGL Programming Guide ('the red book'), Neider, Davis and Woo (1993).

Version:

2.3, 23rd November, 2003.

Author:

Jo Wood

Constructor Summary

SurfNormals()

Method Summary

static float[][][]

findNormals(float[][] rast, int nRows, int nCols, float zScale) Finds the normals of a given raster surface.

Methods inherited from class java.lang.Object

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

Constructor Detail

SurfNormals

public SurfNormals()

Method Detail

findNormals

public static float[][][] findNormals(float[][] rast,
                                      int nRows,
                                      int nCols,
                                      float zScale)

Finds the normals of a given raster surface.

Parameters:

rast - Raster to calculate normals from.

nRows - Number of rows in the raster.

nCols - Number of columns in the raster.

zScale - Relative scale of z values in planimetric units.

Returns:

normal Matrix containing the 3 normal components for each raster cell.