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java.lang.Objectde.grogra.vecmath.geom.VolumeBase
de.grogra.vecmath.geom.TransformableVolume
de.grogra.vecmath.geom.FrustumBase
de.grogra.vecmath.geom.Cylinder
public class Cylinder
This class represents the geometry of a cylinder. In local object coordinates, the center is located at the origin, the axis points in the z-direction, the radius is 1, and the cylinder's z-coordinates extend from -1 to +1.
Field Summary | |
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boolean |
baseOpen
|
boolean |
topOpen
|
Fields inherited from class de.grogra.vecmath.geom.FrustumBase |
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BASE, LATERAL, scaleV, TOP |
Fields inherited from class de.grogra.vecmath.geom.TransformableVolume |
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m00, m01, m02, m10, m11, m12, m20, m21, m22, t0, t1, t2 |
Constructor Summary | |
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Cylinder()
|
Method Summary | |
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boolean |
computeIntersections(Line line,
int which,
IntersectionList list,
Intersection excludeStart,
Intersection excludeEnd)
Computes intersections between the boundary surface of this object and the specified line . |
void |
computeNormal(Intersection is,
Vector3d normal)
This method computes the unit normal vector of an intersection is which has been computed previously by the invocation
of Volume.computeIntersections(de.grogra.vecmath.geom.Line, int, de.grogra.vecmath.geom.IntersectionList, de.grogra.vecmath.geom.Intersection, de.grogra.vecmath.geom.Intersection) on this volume. |
void |
computeTangents(Intersection is,
Vector3d dpdu,
Vector3d dpdv)
This method computes the derivatives of the surface point (as function of the uv-coordinates, see Volume.computeUV(de.grogra.vecmath.geom.Intersection, javax.vecmath.Vector2d) )
with respect to u and v at the intersection point. |
void |
computeUV(Intersection is,
Vector2d uv)
This method computes the uv-coordinates of an intersection point is which has been computed previously by the invocation
of Volume.computeIntersections(de.grogra.vecmath.geom.Line, int, de.grogra.vecmath.geom.IntersectionList, de.grogra.vecmath.geom.Intersection, de.grogra.vecmath.geom.Intersection) on this volume. |
boolean |
contains(Tuple3d point,
boolean open)
Determines if the given point lies within this object. |
void |
getExtent(Tuple3d min,
Tuple3d max,
Variables temp)
Computes the extent of this volume, i.e., an axis-aligned bounding box between min and max . |
Methods inherited from class de.grogra.vecmath.geom.FrustumBase |
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boxContainsBoundary, intersect |
Methods inherited from class de.grogra.vecmath.geom.TransformableVolume |
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getDiscExtent, getDiscsExtent, getFrobeniusNorm, getObjectToWorldRotationScale, getTransformation, invalidate, invTransformPoint, scale, setTransformation, setTransformation, transformPoint, transformTranspose, transformVector, translate |
Methods inherited from class de.grogra.vecmath.geom.VolumeBase |
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addConvexIntersections, getId, operator$and, operator$com, operator$or, operator$sub, setId |
Methods inherited from class java.lang.Object |
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clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait |
Field Detail |
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public boolean baseOpen
public boolean topOpen
Constructor Detail |
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public Cylinder()
Method Detail |
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public boolean computeIntersections(Line line, int which, IntersectionList list, Intersection excludeStart, Intersection excludeEnd)
Volume
line
. The intersections are added
to list
in ascending order of distance
(i.e., of Intersection.parameter
), where the
parameter
has to lie between line.start
and line.end
.
Implementations of this method must not
clear or modify the existing intersections in list
.
The parameter which
has to be one of
Intersection.ALL
, Intersection.CLOSEST
,
Intersection.ANY
. It determines if all intersections
have to be added to the list, only the closest (minimal
value of Intersection.parameter
), or an arbitrary
of the set of all intersections. Only in case of ALL
,
the return value of this method is precise.
If specific intersection points should be excluded from the list
of computed intersections, they have to be specified in
excludeStart
and excludeEnd
.
The intersection point of excludeStart
has to be the
starting point of line
, the intersection point of
excludeEnd
has to be the end point of line
.
The exclusion of intersections is a useful feature for
ray-tracing, e.g., when a ray is re-emitted at an intersection point
in another direction.
line
- a linewhich
- one of Intersection.ALL
,
Intersection.CLOSEST
, Intersection.ANY
, this
determines which intersections have to be added to list
list
- the intersections are added to this listexcludeStart
- intersection at start point which shall be excluded, or null
excludeEnd
- intersection at end point which shall be excluded, or null
true
iff the beginning of the line lies
within the volume (i.e., if the line starts within the volume or
enters the volume at the starting point); however note that the returned
value is valid only if which == Intersection.ALL
public void computeNormal(Intersection is, Vector3d normal)
Volume
is
which has been computed previously by the invocation
of Volume.computeIntersections(de.grogra.vecmath.geom.Line, int, de.grogra.vecmath.geom.IntersectionList, de.grogra.vecmath.geom.Intersection, de.grogra.vecmath.geom.Intersection)
on this volume.
is
- a previously computed intersectionnormal
- resulting unit vector is placed in herepublic void computeTangents(Intersection is, Vector3d dpdu, Vector3d dpdv)
Volume
Volume.computeUV(de.grogra.vecmath.geom.Intersection, javax.vecmath.Vector2d)
)
with respect to u and v at the intersection point.
is
- a previously computed intersectiondpdu
- resulting derivative with respect to udpdv
- resulting derivative with respect to vpublic void computeUV(Intersection is, Vector2d uv)
Volume
is
which has been computed previously by the invocation
of Volume.computeIntersections(de.grogra.vecmath.geom.Line, int, de.grogra.vecmath.geom.IntersectionList, de.grogra.vecmath.geom.Intersection, de.grogra.vecmath.geom.Intersection)
on this volume.
is
- a previously computed intersectionuv
- resulting uv-coordinates are placed in herepublic boolean contains(Tuple3d point, boolean open)
Volume
point
lies within this object.
If open
is true
, the interior of the volume
is considered (the largest open set contained in the volume,
i.e., excluding the boundary), otherwise the closure of the volume.
point
- a point in global world coordinatesopen
- consider open or closed set
true
iff point
is an element of the setpublic void getExtent(Tuple3d min, Tuple3d max, Variables temp)
Volume
min
and max
.
min
- minimum coordinates of bounding box are placed in heremax
- maximum coordinates of bounding box are placed in heretemp
- has to be provided by the invoker, may be used in implementations
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