de.grogra.vecmath.geom
Class FrustumBase

java.lang.Object
  de.grogra.vecmath.geom.VolumeBase
      de.grogra.vecmath.geom.TransformableVolume
          de.grogra.vecmath.geom.FrustumBase

All Implemented Interfaces:

Volume

Direct Known Subclasses:

Cone, Cylinder

public abstract class FrustumBase
extends TransformableVolume

This class represents the geometry of a cone. In local object coordinates, the tip is located at the origin, the axis points in the z-direction, and the half opening angle is 45 degrees.

Author:

Ole Kniemeyer

Field Summary

static int	BASE
static int	LATERAL
float	scaleV Scaling factor for v coordinate: v coordinates of lateral face range from 0 to scaleV.
static int	TOP

Fields inherited from class de.grogra.vecmath.geom.TransformableVolume

m00, m01, m02, m10, m11, m12, m20, m21, m22, t0, t1, t2

Constructor Summary

FrustumBase()

Method Summary

boolean	boxContainsBoundary(BoundingBox box, Tuple3d center, double radius, Variables temp) Returns true if the specified box contains (part of) the boundary surface of this volume.
boolean	intersect(Line line) Intersects this object with line.

Methods inherited from class de.grogra.vecmath.geom.TransformableVolume

getDiscExtent, getDiscsExtent, getFrobeniusNorm, getObjectToWorldRotationScale, getTransformation, invalidate, invTransformPoint, scale, setTransformation, setTransformation, transformPoint, transformTranspose, transformVector, translate

Methods inherited from class de.grogra.vecmath.geom.VolumeBase

addConvexIntersections, getId, operator$and, operator$com, operator$or, operator$sub, setId

Methods inherited from class java.lang.Object

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

Methods inherited from interface de.grogra.vecmath.geom.Volume

computeIntersections, computeNormal, computeTangents, computeUV, contains, getExtent

Field Detail

BASE

public static final int BASE

See Also:

Constant Field Values

LATERAL

public static final int LATERAL

See Also:

Constant Field Values

scaleV

public float scaleV

Scaling factor for v coordinate: v coordinates of lateral face range from 0 to scaleV.

TOP

public static final int TOP

See Also:

Constant Field Values

Constructor Detail

FrustumBase

public FrustumBase()

Method Detail

boxContainsBoundary

public boolean boxContainsBoundary(BoundingBox box,
                                   Tuple3d center,
                                   double radius,
                                   Variables temp)

Description copied from interface: Volume

Returns true if the specified box contains (part of) the boundary surface of this volume. Otherwise, if box and boundary do not overlap, this method should return false, but may also return true if an exact computation would be too expensive or complicated.

Note that a box contains the boundary of a closed set S iff both have a non-empty intersection and the box is not contained in the open set of S.

Parameters:

box - bounding box

center - center coordinates of box

radius - radius of enclosing sphere

temp - has to be provided by the invoker, may be used in implementations

Returns:

true if box contains (part of) the boundary of this volume

intersect

public boolean intersect(Line line)

Intersects this object with line. The result is will be written to line by a modification of Line.start and Line.end.

Parameters:

line - the line to intersect with

Returns:

true iff the computed intersection is valid and not empty