artisynth.core.mfreemodels

Class MFreeModel3d.MFreeRestNode3d

java.lang.Object

artisynth.core.mfreemodels.MFreeModel3d.MFreeRestNode3d

All Implemented Interfaces:

Boundable

Enclosing class:

MFreeModel3d

public static class MFreeModel3d.MFreeRestNode3d
extends java.lang.Object
implements Boundable

Wrapper boundable class around MFreeNode3d that considers the node at rest, as well as its influence radius.

Constructor Summary

Constructors

Constructor and Description
MFreeRestNode3d(MFreeNode3d node)

Method Summary

Modifier and Type	Method and Description
void	computeCentroid(Vector3d centroid) Computed the centroid of this element.
double	computeCovariance(Matrix3d C) Computes the covariance of the element, assuming a uniform density of one.
MFreeNode3d	getNode()
Point3d	getPoint(int idx) Returns the idx-th point associated with this element.
int	numPoints() Returns the number of points associated with this element, if any, or zero otherwise.
void	updateBounds(Vector3d min, Vector3d max) Updates the axis-aligned bounds of this element.

Methods inherited from class java.lang.Object

equals, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

MFreeRestNode3d

public MFreeRestNode3d(MFreeNode3d node)

Method Detail

numPoints

public int numPoints()

Description copied from interface: Boundable

Returns the number of points associated with this element, if any, or zero otherwise. If the element has points, then it's spatial extent is assumed to be enclosed within their convex hull. At present, elements that do not have points cannot be enclosed within oriented bounding box (OBB) trees.

Specified by:

numPoints in interface Boundable

Returns:

number of points associated with this element

getPoint

public Point3d getPoint(int idx)

Description copied from interface: Boundable

Returns the idx-th point associated with this element.

Specified by:

getPoint in interface Boundable

Parameters:

idx - index of the point (must be on the range 0 to Boundable.numPoints()).

Returns:

idx-th point associated with this element. Must not be modified.

computeCentroid

public void computeCentroid(Vector3d centroid)

Description copied from interface: Boundable

Computed the centroid of this element.

Specified by:

computeCentroid in interface Boundable

Parameters:

centroid - returns the computed centroid value.

updateBounds

public void updateBounds(Vector3d min,
                         Vector3d max)

Description copied from interface: Boundable

Updates the axis-aligned bounds of this element. The value in min and max should be decreased or increased, respectively, so that all spatial points associated with this element lie within the axis-aligned box defined by min and max.

Specified by:

updateBounds in interface Boundable

Parameters:

min - minimum values to be updated

max - maximum values to be updated

computeCovariance

public double computeCovariance(Matrix3d C)

Description copied from interface: Boundable

Computes the covariance of the element, assuming a uniform density of one. The covariance is defined as

 int_V \rho x x^T dV,
 

where \rho is the density, x is any spatial point within the element, and the integral is evaluated over the element's spatial extent. The method returns the element's spatial size, which for elements of dimension 3, 2, 1, or 0 will be a volume, area, length, or discrete value.

Implementation of this method is optional, with non-implementation indicated by having the method return -1. Non-implementation may prevent the element from being enclosed within certain types of oriented bounding box (OBB) constructions.

Specified by:

computeCovariance in interface Boundable

Parameters:

C - returns the covariance

Returns:

spatial size of the element, or -1 if this method is not implemented.

getNode

public MFreeNode3d getNode()