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 SimplexTurbulence2 &=SimplexTurbulence2(0.0, 1.0, 1.0, 0.5, 0.5, 4), const double &=1.0)
	Create a noise disc primitive.
virtual ScalarAlpha	ElevationAlpha (const Vector2 &) const
	Compute material at a given point.
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.
void	Draw (QGraphicsScene &) const
	Renders the node into a QGraphicsScene.
Public Member Functions inherited from TerraPrimitive
	TerraPrimitive (const double &=1.0, const double &=1.0)
	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.
double	Alpha (const double &) const
	Compute the falloff function.
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.
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.
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
double	t0
	Reference noise at the center, internal parameter to speedup computations.
SimplexTurbulence2	turbulence
	Turbulence.
Protected Attributes inherited from TerraDisc
Disc2	disc
	Disc.
double	z
	Elevation.
Protected Attributes inherited from TerraPrimitive
double	alpha = 1.0
	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 & r, const SimplexTurbulence2 & tu = SimplexTurbulence2(0.0, 1.0, 1.0, 0.5, 0.5, 4), 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(), t0, TerraDisc::TerraDisc(), turbulence, 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 TerraPrimitive::Alpha(), TerraNode::box, TerraDisc::disc, t0, turbulence, and TerraDisc::z.