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 SimplexTurbulence2 &, const double &=1.0)
	Create a noise disc primitive.
	TerraVertexNoise (const Vector &, const Vector &, const double &, const SimplexTurbulence2 &, const double &=1.0)
	Create a noise disc primitive.
virtual ScalarAlpha	ElevationAlpha (const Vector2 &) const
	Compute the elevation and weight.
virtual int	Memory () const
	Compute the size of a node.
Public Member Functions inherited from TerraVertex
	TerraVertex (const Vector &, const double &, const double &=1.0)
	Create a flat point primitive.
	TerraVertex (const Vector &, const Vector &, const double &, const double &=1.0)
	Create a disc primitive.
	TerraVertex (const Vector &, const Vector2 &, const double &, const double &=1.0)
	Create a disc primitive.
virtual 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 TerraVertex
Vector	c
	Center, includes elevation.
Vector2	slope
	Slope along x and y directions.
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

TerraVertexNoise() [1/2]

TerraVertexNoise::TerraVertexNoise ( const Vector & c, const double & r, const SimplexTurbulence2 & t, 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, TerraVertex::TerraVertex(), and turbulence.

Referenced by Memory().

TerraVertexNoise() [2/2]

TerraVertexNoise::TerraVertexNoise ( const Vector & c, const Vector & n, const double & r, const SimplexTurbulence2 & t, 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, TerraVertex::TerraVertex(), and turbulence.

Member Function Documentation

ElevationAlpha()

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

virtual

Compute the elevation and weight.

Parameters

p

Point.

Reimplemented from TerraVertex.

References TerraPrimitive::Alpha(), TerraNode::box, TerraVertex::c, TerraVertex::slope, t0, and turbulence.

Memory()

int TerraVertexNoise::Memory ( ) const

virtual

Compute the size of a node.

Reimplemented from TerraVertex.

References TerraVertexNoise().