BezierPatch Class Reference

A bezier surface with arbitrary dimensions. More...

#include <labelingmath.h>

List of all members.

Public Member Functions
	BezierPatch (bool useDisplayList=true)
	Default constructor.
	~BezierPatch ()
	Default destructor. Frees all allocated resources.
void	setCtrlPoints (tgt::vec3 *ctrlPoints, int degreeS, int degreeT)
	Sets the patch's control points.
int	getDegreeS ()
	Returns the patch's horizontal dimension (see constructor).
int	getDegreeT ()
	Returns the patch's vertical dimension (see constructor).
tgt::vec3 *	getCtrlPoints (int &degreeS, int &degreeT)
	Returns a pointer to the control point array and writes the patch's dimensions to ref parameters degreeS and degreeT.
tgt::vec3	getPoint (float s, float t)
	Returns the surface point at parameters s and t.
tgt::vec3	getTangentS (float s, float t)
	Returns the tangent in s-direction at the surface point at parameters s and t.
tgt::vec3	getTangentT (float s, float t)
	Returns the tangent in t-direction at the surface point at parameters s and t.
tgt::vec3	getNormal (float s, float t)
	Returns the normal at the surface point at parameters s and t.
void	render (int s_steps=10, int t_steps=10, bool genTexCoords=false, GLuint texUnit=0)
	Renders the whole patch (parameter range [0:1]^2) as a quad strip and optionally generates texture coordinates for an arbitrary texture unit.

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Detailed Description

A bezier surface with arbitrary dimensions.

The patch is determined by an array of control points with dimensions (degreeS+1)x(degreeT+1). The surface point at parameters s=t=0 is the lower left control point, the surface point at parameters s=t=1 is the upper right control point.

Definition at line 311 of file labelingmath.h.

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Member Function Documentation

vec3 * getCtrlPoints	(	int &	degreeS,
		int &	degreeT
	)

Returns a pointer to the control point array and writes the patch's dimensions to ref parameters degreeS and degreeT.

Definition at line 395 of file labelingmath.cpp.

vec3 getNormal	(	float	s,
		float	t
	)

Returns the normal at the surface point at parameters s and t.

Definition at line 434 of file labelingmath.cpp.

vec3 getTangentS	(	float	s,
		float	t
	)

Returns the tangent in s-direction at the surface point at parameters s and t.

Definition at line 412 of file labelingmath.cpp.

vec3 getTangentT	(	float	s,
		float	t
	)

Returns the tangent in t-direction at the surface point at parameters s and t.

Definition at line 423 of file labelingmath.cpp.

void render	(	int	s_steps = 10,
		int	t_steps = 10,
		bool	genTexCoords = false,
		GLuint	texUnit = 0
	)

Renders the whole patch (parameter range [0:1]^2) as a quad strip and optionally generates texture coordinates for an arbitrary texture unit.

Internally a display list is used to speed up rendering.

Parameters:

	s_steps	number of samplings in s-direction (horizontal)
	t_steps	number of samplings in t-direction (vertical)
	genTextureCoords	determines if texture coordinates are generated
	texUnit	texture unit the texture coordinates are generated for

Definition at line 442 of file labelingmath.cpp.

void setCtrlPoints	(	tgt::vec3 *	ctrlPoints,
		int	degreeS,
		int	degreeT
	)

Sets the patch's control points.

Parameters:

	ctrlPoints	control point array, ordered row-wise, beginning at the bottom row
	degreeS	patch's degree in "horizontal" direction: length of a row of the control point array = degreeS+1
	degreeT	patch's degree in "vertical" direction: length of a column of the control point array = degreeT+1

Definition at line 383 of file labelingmath.cpp.