Mesh Class Reference

Mesh class. More...

#include <mesh.h>

Public Member Functions
	Mesh ()
	Constructor for mesh.
	~Mesh ()
	Destructor for mesh.
void	GenerateGrid (int resX, int resY, float x0, float x1, float y0, float y1, bool vertical)
	Generates a grid.
bool	LoadHeightMap (const char *filename, float x0, float x1, float y0, float y1, float h0, float h1)
	Generate grid from heightmap texture.
void	CreateVBO ()
	Creates a Vertex Buffer Object (VBO).
void	DeleteVBO ()
	Deletes a Vertex Buffer Object (VBO).
void	DrawOpenGL ()
	Draws the grid in OpenGL.
void	DrawVBO ()
	Draws the grid as a Vertex Buffer Object (VBO).
unsigned int	GetNumTriangles ()
	Calculates the number of triangles (faces) in the grid.
Data Fields
float	hmin
float	hmax
Private Member Functions
void	m_AddVertex (float x, float y, float z, Vec3f &normal)
	Adds a vertex in the list of vertices.
void	m_Clear ()
	Clears the vertex list and the face list.
void	m_ReadHeight (int x, int z, float dx, float dz, float h0, float h1, unsigned char *data, int bytesPerPixel, int width, int height, float &h, Vec3f &n)
	Convert pixel values to a height value and a normal.
Private Attributes
int	m_numVertices
int	m_numFaces
GLfloat *	m_vertArray
GLuint *	m_faceArray
GLuint	m_vertexVBO
GLuint	m_indexVBO

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Detailed Description

Mesh class.

Defines a horizontal or vertical grid. Support for VBO also included.

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Constructor & Destructor Documentation

Mesh::Mesh

(

)

Constructor for mesh.

Mesh::~Mesh

(

)

Destructor for mesh.

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Member Function Documentation

void Mesh::GenerateGrid	(	int	resX,
		int	resY,
		float	x0,
		float	x1,
		float	y0,
		float	y1,
		bool	vertical
	)

Generates a grid.

Generates a rectangular grid between (x0,y0) and (x1,y1). If vertical is TRUE the grid will be in the xy-plane, otherwise it will be in the xz-plane.

Parameters:

	resX	the resolution in the x direction.
	resY	the resolution in the y(z) direction.
	x0	the x component of the starting point.
	x1	the x component of the ending point.
	y0	the y component of the starting point.
	y1	the y component of the ending point.
	vertical	decides if the grid is vertical or horizontal.

See also:

m_AddVertex()

bool Mesh::LoadHeightMap	(	const char *	filename,
		float	x0,
		float	x1,
		float	z0,
		float	z1,
		float	h0,
		float	h1
	)

Generate grid from heightmap texture.

Load a TGA-image and create a mesh with the same resolution and set the gray-scale values as height.

Parameters:

	filename	filename
	x0	x lower bound
	x1	x upper bound
	z0	z lower bound
	z1	z upper bound
	h0	y lower bound
	h1	y upper bound

Returns:

TRUE if mesh is successfully loaded

void Mesh::CreateVBO

(

)

Creates a Vertex Buffer Object (VBO).

void Mesh::DeleteVBO

(

)

Deletes a Vertex Buffer Object (VBO).

void Mesh::DrawOpenGL

(

)

Draws the grid in OpenGL.

void Mesh::DrawVBO

(

)

Draws the grid as a Vertex Buffer Object (VBO).

unsigned int Mesh::GetNumTriangles

(

)

Calculates the number of triangles (faces) in the grid.

Returns:

the number of triangles.

void Mesh::m_AddVertex	(	float	x,
		float	y,
		float	z,
		Vec3f &	normal
	)			[private]

Adds a vertex in the list of vertices.

Parameters:

	x	x position
	y	y position
	z	z position
	normal	normal vector

void Mesh::m_Clear

(

)

[private]

Clears the vertex list and the face list.

void Mesh::m_ReadHeight	(	int	x,
		int	z,
		float	dx,
		float	dz,
		float	h0,
		float	h1,
		unsigned char *	data,
		int	bytesPerPixel,
		int	width,
		int	height,
		float &	h,
		Vec3f &	n
	)			[private]

Convert pixel values to a height value and a normal.

Parameters:

	x	x position
	z	z position
	dx	x scale
	dz	z scale
	h0	lower bound for mesh
	h1	upper bound for mesh
	data	pointer to pixel data
	bytesPerPixel	format of pixel data
	width	width of height texture
	height	height of height texture
	h	height at given point
	n	normal at given point

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Field Documentation

float Mesh::hmin

float Mesh::hmax

int Mesh::m_numVertices [private]

Number of vertices

int Mesh::m_numFaces [private]

Number of triangles

GLfloat* Mesh::m_vertArray [private]

List of vertices

GLuint* Mesh::m_faceArray [private]

List of faces

GLuint Mesh::m_vertexVBO [private]

Identification for VBO

GLuint Mesh::m_indexVBO [private]

Identification for VBO

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

• C:/Kod/testshell/utils/mesh.h
• C:/Kod/testshell/utils/mesh.cpp

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