Display::IsoSurface Class Reference

#include <isosurface.h>

List of all members.

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Detailed Description

Mesh generator with the marching cube algorithm.

Display an isosurface of a 3D image. It uses the marching cube algorithm to display the isosurface mesh.

To compute the normal of the mesh two options are available. The first method uses the triangle normals. The resulting mesh is blocky as the normal is identical on the whole triangle. The second method uses the data gradient. The resulting mesh is smoother as the normal is different on the triangle. The default is to use the gradient method as it gives a nicer mesh.

It the isosurface to be displayed is showing a darker region, the surface normals must be changed as they normally points from bright to dark regions.

For better results use the following OpenGL initialization:

   glShadeModel(GL_SMOOTH);
   glEnable(GL_DEPTH_TEST);
   glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);

The Marching Cube code is adapted from Paul Bourke code which can be found at: http://local.wasp.uwa.edu.au/~pbourke/modelling/polygonise/

Public Member Functions
	IsoSurface ()
	~IsoSurface ()
void	display () const
template<typename DataType>
void	update (const DataType *data, unsigned int width, unsigned int height, unsigned depth, float isovalue, bool from_bright_to_dark=true, bool use_gradient=true)
Classes
struct	GRIDCELL
struct	TRIANGLE
struct	XYZ

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Constructor & Destructor Documentation

Display::IsoSurface::IsoSurface

(

)

Display::IsoSurface::~IsoSurface

(

)

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Member Function Documentation

void Display::IsoSurface::display

(

)

const

display the isosurface mesh

template<typename DataType>

void Display::IsoSurface::update	(	const DataType *	data,
		unsigned int	width,
		unsigned int	height,
		unsigned	depth,
		float	isovalue,
		bool	from_bright_to_dark = true,
		bool	use_gradient = true
	)			[inline]

create a new mesh

Parameters:

	data	3D image to extract the isovalue
	width	width of the data
	height	height of the data
	depth	depth of the data
	isovalue	isovalue to extract
	from_bright_to_dark	is the surface enclosing a bright (true) or dark (false) surface
	use_gradient	compute the surface normals from the image gradient (smoother) rather than using triangle normals (produces facets)

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The documentation for this class was generated from the following file:

• isosurface.h