TerraDiscNoise Class Reference

Procedural noise over a disc. More...

#include <archestree.h>

Inheritance diagram for TerraDiscNoise:

Public Member Functions
	TerraDiscNoise (const Disc2 &, const double &, const double &, const double &, const double &, const double &=1.0)
	Create a noise disc primitive. More...
virtual ScalarAlpha	ElevationAlpha (const Vector2 &) const
	Compute material at a given point. More...
virtual int	Memory () const
	Compute the size of the node.
Public Member Functions inherited from TerraDisc
	TerraDisc (const Disc2 &, const double &, const double &, const double &=1.0)
	Create a flat disc primitive. More...
void	Draw (QGraphicsScene &) const
	Renders the node into a QGraphicsScene. More...
Public Member Functions inherited from TerraSkeleton
	TerraSkeleton (const double &, const double &)
	Create a primitive with a radial falloff function. More...
double	Alpha (const double &) const
	Compute the falloff function. 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...

Protected Attributes
double	a
	Amplitude of the noise.
double	lambda
	Fundamental wavelength.
double	t0
	Reference noise at the center, internal parameter to speedup computations.
Protected Attributes inherited from TerraDisc
Disc2	disc
	Disc.
double	z
	Elevation.
Protected Attributes inherited from TerraSkeleton
double	alpha
	Weight.
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

Procedural noise over a disc.

Constructor & Destructor Documentation

TerraDiscNoise()

TerraDiscNoise::TerraDiscNoise ( const Disc2 &  d, const double &  z, const double &  a, const double &  lambda, const double &  r, const double &  al = 1.0  )

explicit

Create a noise disc primitive.

Parameters

d	Disc.
z	Base elevation.
a	Amplitude of the noise.
lambda	Fundamental wavelength.
r	Radius.
al	Alpha.

References TerraNode::box, Circle2::Center(), Box2::Extended(), Circle2::GetBox(), lambda, t0, SimplexTurbulence2::Value(), and TerraDisc::z.

Referenced by Memory().

Member Function Documentation

ElevationAlpha()

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

virtual

Compute material at a given point.

Parameters

p

Point.

Reimplemented from TerraDisc.

References a, TerraSkeleton::Alpha(), TerraNode::box, TerraDisc::disc, Box2::Inside(), lambda, Disc2::R(), t0, SimplexTurbulence2::Value(), and TerraDisc::z.