Image-based height field nodes. More...

#include <archestree.h>

Inheritance diagram for TerraQuadrangleImage:

Public Member Functions
	TerraQuadrangleImage (const QString &, const QString &, const Quadrangle &, const double &, const double &, const double &, const double &, const double &=0.5)
	Create the node. More...

	TerraQuadrangleImage (const QString &, const Quadrangle &, const double &, const double &, const double &, const double &, const double &=0.5)
	Create the node. More...

virtual ScalarAlpha	ElevationAlpha (const Vector2 &) const
	Compute the elevation and weight. More...

virtual int	Memory () const
	Compute the size of a node. More...

Public Member Functions inherited from TerraImages
	TerraImages (const QString &)
	Create the node. More...

	TerraImages (const QString &, const QString &)
	Create an image primitive. More...

Public Member Functions inherited from TerraPrimitive
	TerraPrimitive ()
	Create a primitive.

	~TerraPrimitive ()
	Recusively destroy the sub-trees.

int	Traversal (const Vector2 &) const
	Compute the number of nodes that are traversed when evaluating the tree. More...

Public Member Functions inherited from TerraNode
	TerraNode (const Box2 &=Box2::Infinity)
	Create a node. More...

virtual Box2	GetBox () const
	Returns the bouding box of a node.

virtual double	Elevation (const Vector2 &) const
	Compute the elevation at a given position. More...

virtual double	Alpha (const Vector2 &) const
	Compute the alpha mask at a given position. More...

virtual Vector2	Gradient (const Vector2 &) const
	Compute the gradient at a given position. More...

virtual Vector	Normal (const Vector2 &) const
	Compute the normal at a given position. More...

virtual void	writeJson (QJsonObject &)
	Compute the Json Document of the subtree.

ScalarField2	Sample (const Array2 &) const
	Create a discrete scalar field by sampling the elevation over a given domain. More...

ScalarField2	Alpha (const Array2 &) const
	Create a discrete scalar field by sampling the elevation over a given domain. More...

void	Blend (HeightField &) const
	Blend a given node with an existing terrain over an input heightfield. More...

void	Add (HeightField &) const
	Add a given node with an existing heightfield. More...

virtual void	Draw (QGraphicsScene &) const
	Renders the node into a QGraphicsScene. More...

Protected Attributes
Quadrangle	q
	Location of quad where the image maps.

double	zd
	Scaling of the elevation at the corners.

Protected Attributes inherited from TerraImages
int	ref
	Index storing the reference to the field.

int	alf
	Index storing the reference to the field.

Protected Attributes inherited from TerraNode
Box2	box = Box2::Infinity
	Bounding box.

Additional Inherited Members
Static Public Member Functions inherited from TerraImages
static void	Store (const ScalarField2 &, const QString &)
	Store an image in the set of image instances. More...

static void	Store (const QImage &, const QString &)
	Store an image in the set of image instances. More...

static void	Store (const QString &, const QString &)
	Store an image in the set of image instances. More...

Protected Member Functions inherited from TerraImages
const ScalarField2 &	GetImage (int) const
	Get the reference to the k-th image in the atlas. More...

Static Protected Member Functions inherited from TerraImages
static bool	ExistsInStorage (const QString &)
	Checks if an image exists in the atlas. More...

static int	IndexInStorage (const QString &)
	Checks if an image exists in the atlas, and returns its index. More...

Static Protected Attributes inherited from TerraImages
static QVector< ScalarField2 >	images
	Set of images that will be shared by the instances of TerraImages.

static QVector< QString >	aliases
	Identifier as names of the images.

Static Protected Attributes inherited from TerraNode
static const double	epsilon = 1e-2
	Epsilon value for gradient computations.

Detailed Description

Image-based height field nodes.

Constructor & Destructor Documentation

◆ TerraQuadrangleImage() [1/2]

TerraQuadrangleImage::TerraQuadrangleImage	(	const QString &	image,
		const QString &	alias,
		const Quadrangle &	q,
		const double &	ha,
		const double &	hb,
		const double &	hc,
		const double &	hd,
		const double &	beta = `0.5`
	)

Create the node.

Parameters

image,alias	The image, its alpha channel is used to compute the weight mask.
q	Quadrangle.
ha,hb,hc,hd	Elevation.
beta	Importance.

References TerraNode::box, q, and zd.

Referenced by Memory().

◆ TerraQuadrangleImage() [2/2]

TerraQuadrangleImage::TerraQuadrangleImage	(	const QString &	alias,
		const Quadrangle &	q,
		const double &	ha,
		const double &	hb,
		const double &	hc,
		const double &	hd,
		const double &	beta = `0.5`
	)

Create the node.

Parameters

alias	The image, its alpha channel is used to compute the weight mask.
q	Quadrangle.
ha,hb,hc,hd	Elevation.
beta	Importance.

References TerraNode::box, q, and zd.

Member Function Documentation

◆ ElevationAlpha()

ScalarAlpha TerraQuadrangleImage::ElevationAlpha ( const Vector2 & p ) const

virtual

Compute the elevation and weight.

Parameters

p Point.

Implements TerraImages.

References TerraImages::alf, Math::BiCubic(), TerraNode::box, TerraImages::GetImage(), Box2::Inside(), Quadrangle2::InverseBilinear(), q, TerraImages::ref, ScalarField2::Value(), Quadrangle::Vertex(), and zd.

◆ Memory()

int TerraQuadrangleImage::Memory ( ) const

virtual

Compute the size of a node.

Reimplemented from TerraNode.

References TerraQuadrangleImage().

Public Member Functions

Protected Attributes

Additional Inherited Members

Detailed Description

Constructor & Destructor Documentation

◆ TerraQuadrangleImage() [1/2]

◆ TerraQuadrangleImage() [2/2]

Member Function Documentation

◆ ElevationAlpha()

◆ Memory()