vl::BezierPatch Class Reference

Defines one or more concatenated bicubic Bézier patches to be used with the BezierSurface class. More...

#include <BezierSurface.hpp>

Inheritance diagram for vl::BezierPatch:

List of all members.

Public Types
typedef std::vector < std::vector< dvec3 > >	Points
	The control points grid defining the bicubic Bézier patch(es).
Public Member Functions
virtual const char *	className ()
	Returns the name of the class.
	BezierPatch ()
	Constructor.
	BezierPatch (int x, int y)
	Constructor.
void	resize (int x, int y)
	Defines the x and y dimensions of the control point grid defining the patch.
int	x () const
	Returns the x dimension of the patch as specified by resize().
int	y () const
	Returns the y dimension of the patch as specified by resize().
Points &	points ()
	The control points grid defining the bicubic Bézier patch(es).
const Points &	points () const
	The control points grid defining the bicubic Bézier patch(es).
Protected Attributes
Points	mControlPoints
int	mX
int	mY

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Detailed Description

Defines one or more concatenated bicubic Bézier patches to be used with the BezierSurface class.

See also:

• Bézier Patches and Surfaces Tutorial for a practical example on how to use the BezierSurface class.
• BezierSurface

---

Member Typedef Documentation

typedef std::vector< std::vector<dvec3> > vl::BezierPatch::Points

The control points grid defining the bicubic Bézier patch(es).

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Constructor & Destructor Documentation

vl::BezierPatch::BezierPatch

(

)

[inline]

Constructor.

vl::BezierPatch::BezierPatch	(	int	x,
		int	y
	)		[inline]

Constructor.

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Member Function Documentation

virtual const char* vl::BezierPatch::className

(

)

[inline, virtual]

Returns the name of the class.

Reimplemented from vl::Object.

void BezierPatch::resize	(	int	x,
		int	y
	)

Defines the x and y dimensions of the control point grid defining the patch.

The x and y parameters must be of the form 3*n+1 with n integer positive, i.e 4 (n=1), 7 (n=2), 10 (n=3) and so on.

- The simplest bicubic Bézier patch requires 4x4 = 16 control points: A, B, C, D, E, F, G, H, I, L, M, N, O, P, Q, R
- The Bézier surface is guaranteed to touch only the 4 corner control points A, D, O and R.

A---B---C---D
|   |   |   |
E---F---G---H
|   |   |   |
I---L---M---N
|   |   |   |
O---P---Q---R

In this case we would call "resize(4,4)"

- You can concatenate two bicubic Bézier patches to form a larger suface by sharing their control points like this:

   patch 1     patch 2
A---+---+---B---+---+---G
|   |   |   |   |   |   |
+---+---+---C---+---+---+
|   |   |   |   |   |   |
+---+---+---D---+---+---+
|   |   |   |   |   |   |
F---+---+---E---+---+---H

In this case we would call "resize(7,4)"

- In this case the two patches share the control points B, C, D and E.
- As we can see the total control points needed are 28 = (2 (patches along x) * 3 + 1) * (1 (patches along y) * 3 + 1)
- Also in this case the Bézier surface is guaranteed to touch only the 6 corner control points A, B, E, F, G and H.

int vl::BezierPatch::x

(

)

const [inline]

Returns the x dimension of the patch as specified by resize().

int vl::BezierPatch::y

(

)

const [inline]

Returns the y dimension of the patch as specified by resize().

Points& vl::BezierPatch::points

(

)

[inline]

The control points grid defining the bicubic Bézier patch(es).

const Points& vl::BezierPatch::points

(

)

const [inline]

The control points grid defining the bicubic Bézier patch(es).

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Member Data Documentation

Points vl::BezierPatch::mControlPoints [protected]

int vl::BezierPatch::mX [protected]

int vl::BezierPatch::mY [protected]

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

• C:/VL/BuildSystem/VL_DISTRO/Visualization_Library_SDK/src/vl/BezierSurface.hpp
• C:/VL/BuildSystem/VL_DISTRO/Visualization_Library_SDK/src/vl/BezierSurface.cpp