TerraBlendGrid Class Reference

The blending node. More...

#include <archestree.h>

Inheritance diagram for TerraBlendGrid:

Public Member Functions
	TerraBlendGrid (QVector< TerraNode * >, int)
	Create a blending operator.
	~TerraBlendGrid ()
	Destroy the node.
virtual ScalarAlpha	ElevationAlpha (const Vector2 &) const
	Compute material at given point.
Public Member Functions inherited from TerraBlend
	TerraBlend (QVector< TerraNode * >)
	Create a blending node.
	TerraBlend (TerraNode *, TerraNode *, TerraNode *=nullptr, TerraNode *=nullptr)
	Create a blending node.
	~TerraBlend ()
	Empty.
virtual void	Draw (QGraphicsScene &) const
	Draw the sub-tree.
virtual int	Traversal (const Vector2 &) const
	Compute the number of nodes that are traversed when evaluating the tree.
virtual void	writeJson (QJsonObject &)
	Compute the Json Document of the subtree.
Public Member Functions inherited from TerraOperator
	TerraOperator (const QVector< TerraNode * > &)
	Create a generic operator.
	TerraOperator (TerraNode *, TerraNode *=nullptr, TerraNode *=nullptr, TerraNode *=nullptr)
	Create a node with several children nodes.
	~TerraOperator ()
	Recursively destroys the complete sub-tree.
virtual int	Memory () const
	Compute the size of a node.
Public Member Functions inherited from TerraNode
	TerraNode (const Box2 &=Box2::Infinity)
	Create a node.
virtual Box2	GetBox () const
	Returns the bouding box of a node.
virtual double	Elevation (const Vector2 &) const
	Compute the elevation at a given position.
virtual double	Alpha (const Vector2 &) const
	Compute the alpha mask at a given position.
virtual Vector2	Gradient (const Vector2 &) const
	Compute the gradient at a given position.
virtual Vector	Normal (const Vector2 &) const
	Compute the normal at a given position.
ScalarField2	Sample (const Array2 &) const
	Create a discrete scalar field by sampling the elevation over a given domain.
ScalarField2	Alpha (const Array2 &) const
	Create a discrete scalar field by sampling the elevation over a given domain.
void	Blend (HeightField &) const
	Blend a given node with an existing terrain over an input heightfield.
void	Add (HeightField &) const
	Add a given node with an existing heightfield.

Protected Attributes
ArrayIndex2	agrid
	Array of nodes.
Protected Attributes inherited from TerraOperator
QVector< TerraNode * >	nodes
	Array of nodes that will be combined.
Protected Attributes inherited from TerraNode
Box2	box = Box2::Infinity
	Bounding box.

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

Detailed Description

The blending node.

The blending node computes the weighted average of the children nodes.

Constructor & Destructor Documentation

TerraBlendGrid()

TerraBlendGrid::TerraBlendGrid ( QVector< TerraNode * > v, int n )

explicit

Create a blending operator.

Parameters

v	Set of nodes.
n	Subdivison.

References agrid, TerraNode::box, TerraOperator::nodes, and TerraBlend::TerraBlend().

Member Function Documentation

ElevationAlpha()

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

virtual

Compute material at given point.

Parameters

p

Point.

Reimplemented from TerraBlend.

References agrid, ScalarAlpha::Alpha(), TerraNode::box, TerraOperator::nodes, and ScalarAlpha::Value().