TerraVertexNoise Class Reference

Procedural noise over a disc. More...

#include <archestree.h>

Inheritance diagram for TerraVertexNoise:

Public Member Functions
	TerraVertexNoise (const Vector &, const double &, const double &, int, const double &, const double &=1.0)
	Create a noise disc primitive. More...
	TerraVertexNoise (const Vector &, const double &, const SimplexTurbulence2 &, const double &=1.0)
	Create a noise disc primitive. 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 TerraVertex
	TerraVertex (const Vector &, const double &, const double &=1.0)
	Create a point primitive. More...
virtual 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	t0
	Reference noise at the center, internal parameter to speedup computations.
SimplexTurbulence2	turbulence
	Turbulence.
Protected Attributes inherited from TerraVertex
Vector	c
	Center, includes 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

TerraVertexNoise() [1/2]

TerraVertexNoise::TerraVertexNoise ( const Vector &  c, const double &  a, const double &  lambda, int  oc, const double &  r, const double &  al = 1.0  )

explicit

Create a noise disc primitive.

Parameters

c	Center.
a	Amplitude of the noise.
lambda	Fundamental wavelength.
oc	Octaves.
r	Radius.
al	Alpha.

Referenced by Memory().

TerraVertexNoise() [2/2]

TerraVertexNoise::TerraVertexNoise ( const Vector &  cc, const double &  r, const SimplexTurbulence2 &  s, const double &  al = 1.0  )

explicit

Create a noise disc primitive.

Parameters

c	Center.
r	Radius.
s	Simplex turbulence.
al	Alpha.

References TerraVertex::c, t0, turbulence, and SimplexTurbulence2::Value().

Member Function Documentation

ElevationAlpha()

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

virtual

Compute the elevation and weight.

Parameters

p

Point.

Reimplemented from TerraVertex.

References TerraSkeleton::Alpha(), TerraNode::box, TerraVertex::c, Box2::Inside(), t0, turbulence, and SimplexTurbulence2::Value().

Memory()

int TerraVertexNoise::Memory ( ) const

virtual

Compute the size of a node.

Reimplemented from TerraVertex.

References TerraVertexNoise().