SDFHeightField Class Reference

Heightfields. More...

#include <sdf.h>

Inheritance diagram for SDFHeightField:

Public Member Functions
	SDFHeightField (const ScalarField2 &)
	Create a heightfield.
	SDFHeightField (const ScalarField2 &, const double &)
	Create a heightfield.
virtual	~SDFHeightField ()
	Destructor.
virtual double	Signed (const Vector &) const
	Compute the signed distance.
virtual int	Memory () const
	Return the size of a sub-tree.
virtual SDFNode *	Copy () const
	Deep copy.
Public Member Functions inherited from SDFPrimitive
	SDFPrimitive ()
	Create a primitive.
virtual	~SDFPrimitive ()
	Destructor.
virtual void	ComputeCostSigned (const Vector &)
	Compute the number of reccursive calls to Signed().
virtual QString	GetCostShader (PrimitiveManager *, std::list< QString > *, bool *) const
	Compute the GLSL code to compute the cost of a call to sdf.
virtual QString	GetMaterialShader (PrimitiveManager *, std::list< QString > *, bool *) const
	Compute the GLSL code to compute the material of the object.
void	setShaderMaterial (ShaderMaterial *)
	Set the material of the primitive for the glsl code.
Public Member Functions inherited from SDFNode
	SDFNode ()
	Create a generic node.
virtual	~SDFNode ()
	Destructor.
virtual double	BID (const Vector &) const
	Compute a lower bound of the signed distance.
virtual Vector	Gradient (const Vector &) const
	Compute the gradient of the field.
virtual bool	Inside (const Vector &) const
	Check if a point is inside or outside.
virtual Color	GetColor (const Vector &) const
	Computes the color.
virtual double	K () const
	Return the Lipschitz constant of the node.
virtual double	K (const Box &) const
	Return the local Lipschitz constant.
Box	GetBox () const
	Return the bounding box of the node.
virtual int	Nodes () const
	Compute the number of nodes in the sub-tree.
virtual QString	GetShader (PrimitiveManager *, std::list< QString > *, bool *=nullptr) const
	Compute the GLSL code to render the node.
virtual QString	GetGradientShader (PrimitiveManager *, std::list< QString > *, bool *=nullptr) const
	Compute the GLSL code to compute the gradient the sdf.
virtual void	ComputeCostBID (const Vector &)
	Compute the number of reccursive calls to BID() and Signed().

Protected Attributes
ScalarField2	hf
	Elevation data, we simply rely on a ScalarField2 for storage purposes, as we do not need specific Heightfield functions.
Protected Attributes inherited from SDFNode
Box	box = Box::Infinity
	Box bounding the surface.
double	k = 1.0
	Lipschitz constant.
int	cost = 1
	Relative computation cost.

Additional Inherited Members
Static Public Member Functions inherited from SDFNode
static void	ResetReccursiveCalls ()
	Reset the reccursive call property of the tree.
static int	ReccursiveCalls ()
	Returns the number of reccursive calls to Value() and BID().
static void	addReccursiveCalls (int)
	Add a nulber to the nbreccursiveCalls.
static SDFNode *	Stalactite (const Vector &p, const double &h, const double &r, bool noise=true, Random &random=Random::R239, const double &largeur=0.25, const double &espacement=0.61)
	Procedural parameterized stalactite.
static SDFNode *	SpherePieces ()
	Sphere carved, placed on a cylinder. Nice scene for testing sharp features reconstruction.
Static Protected Attributes inherited from SDFNode
static constexpr double	Epsilon = 0.01
	Small constant used for bounding volumes.
static int	reccursiveCalls = 0
	Recursive calls to BID or Value.

Detailed Description

Heightfields.

Heightfield primitives are defined as the intersection of a vertical box with the half-space delimited by the surface of the heightfield.

Constructor & Destructor Documentation

SDFHeightField() [1/2]

SDFHeightField::SDFHeightField ( const ScalarField2 & h )

explicit

Create a heightfield.

The box is computed from the range of elevations of the heightfield.

Parameters

h	Heightfield.

SDFHeightField() [2/2]

SDFHeightField::SDFHeightField ( const ScalarField2 & h, const double & z )

explicit

Create a heightfield.

Parameters

h	Heightfield.
z	Minimum elevation.

Member Function Documentation

Memory()

int SDFHeightField::Memory ( ) const

virtual

Return the size of a sub-tree.

Reimplemented from SDFNode.

Signed()

double SDFHeightField::Signed ( const Vector & p ) const

virtual

Compute the signed distance.

Parameters

p

Point.

This function uses the bi-cubic interpolation for computing the elevation of the heightfield.

Reimplemented from SDFPrimitive.