TerraPrimitive Class Reference

Primitives. More...

#include <archestree.h>

Inheritance diagram for TerraPrimitive:

Public Member Functions
	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 ScalarAlpha	ElevationAlpha (const Vector2 &) const
	Compute the elevation and weight.
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.
virtual int	Memory () const
	Compute the size of a node.
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.
virtual void	Draw (QGraphicsScene &) const
	Renders the node into a QGraphicsScene.

Protected Attributes
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

Primitives.

Virtual class grouping primitives in the inheritance hierarchy.

Member Function Documentation

Alpha()

double TerraPrimitive::Alpha ( const double & d ) const

inline

Compute the falloff function.

Parameters

d	Squared distance to the center.

References alpha, and Quadric::SmoothCompact().

Referenced by TerraBox::ElevationAlpha(), TerraDisc::ElevationAlpha(), TerraDiscNoise::ElevationAlpha(), TerraOcean::ElevationAlpha(), TerraVertex::ElevationAlpha(), TerraVertexNoise::ElevationAlpha(), TerraVertexNoiseRydge::ElevationAlpha(), and TerraQuadricCurveSet::Value().

Traversal()

int TerraPrimitive::Traversal ( const Vector2 & p ) const

virtual

Compute the number of nodes that are traversed when evaluating the tree.

Parameters

p

Point.

Reimplemented from TerraNode.

References TerraNode::box.