TerraCrater Class Reference

Craters. More...

#include <archestree.h>

Inheritance diagram for TerraCrater:

Public Member Functions
	TerraCrater (const Vector2 &, const double &, const double &, const double &, const double &)
	Create a crater. More...
	~TerraCrater ()
	Empty.
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 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 Member Functions
double	CrestAlpha (const double &) const
	Compute the noise dampening as a function of the distance to the center. More...

Protected Attributes
Vector2	m_center
	Center.
double	rc
	Crest radius.
double	re
	Radius of a point based footprint.
double	m_depth
	Hole depth.
double	m_uplift
	Ridge elevation.
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

Craters.

Constructor & Destructor Documentation

TerraCrater()

TerraCrater::TerraCrater ( const Vector2 &  c, const double &  r, const double &  e, const double &  depth, const double &  uplift  )

explicit

Create a crater.

Parameters

c	Center.
r	Crest radius.
e	External radius.
depth	Depth of the crater.
uplift	Crest height.

References TerraNode::box, m_center, m_depth, m_uplift, rc, and re.

Referenced by Memory().

Member Function Documentation

CrestAlpha()

double TerraCrater::CrestAlpha ( const double &  d ) const

protected

Compute the noise dampening as a function of the distance to the center.

Parameters

d

Distance

References Linear::Affine(), rc, and re.

Referenced by ElevationAlpha().

ElevationAlpha()

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

virtual

Compute the elevation and weight.

Parameters

p

Point.

Reimplemented from TerraNode.

References TerraNode::box, CrestAlpha(), ScalarAlpha::Empty, Box2::Inside(), m_center, Disc2::R(), rc, re, Cubic::SmoothCompact(), Math::Sqr(), and SimplexTurbulence2::Value().

Memory()

int TerraCrater::Memory ( ) const

virtual

Compute the size of a node.

Reimplemented from TerraNode.

References TerraCrater().