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java.lang.Objectde.grogra.graph.impl.Edge
de.grogra.graph.impl.Node
de.grogra.imp3d.objects.Null
de.grogra.imp3d.objects.ColoredNull
de.grogra.imp3d.objects.SensorNode
public class SensorNode
Nested Class Summary |
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Nested classes/interfaces inherited from class de.grogra.graph.impl.Node |
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Node.AccessorBridge, Node.FieldAttributeAccessor, Node.NType |
Nested classes/interfaces inherited from interface de.grogra.util.Map |
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Map.Chain |
Field Summary | |
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static Node.NType |
$TYPE
|
protected float |
exponent
|
static Node.NType.Field |
exponent$FIELD
|
protected float |
radius
|
static Node.NType.Field |
radius$FIELD
|
protected boolean |
twoSided
|
static Node.NType.Field |
twoSided$FIELD
|
Fields inherited from class de.grogra.imp3d.objects.ColoredNull |
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color, color$FIELD |
Fields inherited from class de.grogra.imp3d.objects.Null |
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transform, transform$FIELD, TRANSFORMING_MASK, transforming$FIELD, USED_BITS |
Fields inherited from class de.grogra.graph.impl.Node |
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ADDITIONAL_FIELDS, bits, DELETED, EXTENT_BIT, EXTENT_MASK, extentIndex$FIELD, extentTail$FIELD, HAS_OBSERVERS, IS_INTERPRETIVE, isInterpretive$FIELD, LAST_EXTENT_INDEX, layer$FIELD, MARK, mark$FIELD, MIME_TYPE, MIN_UNUSED_SPECIAL_OF_SOURCE, MIN_UNUSED_SPECIAL_OF_TARGET, name$FIELD |
Fields inherited from interface de.grogra.ray.physics.Scattering |
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DELTA_FACTOR, IS_NON_OPAQUE, MIN_UNUSED_FLAG, NEEDS_NORMAL, NEEDS_POINT, NEEDS_TANGENTS, NEEDS_TRANSFORMATION, NEEDS_UV, RANDOM_RAYS_GENERATE_ORIGINS |
Fields inherited from interface de.grogra.util.Map |
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DEFAULT_VALUE, EMPTY_MAP |
Constructor Summary | |
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SensorNode()
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Method Summary | |
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double |
completeRay(Environment env,
Point3d vertex,
Ray out)
|
float |
computeBSDF(Environment env,
Vector3f in,
Spectrum specIn,
Vector3f out,
boolean adjoint,
Spectrum bsdf)
Evaluates bidirectional scattering distribution function for given input. |
double |
computeExitance(Environment env,
Spectrum exitance)
Evaluates the exitance function for given input. |
void |
draw(java.lang.Object object,
boolean asNode,
RenderState rs)
|
void |
generateRandomOrigins(Environment env,
RayList out,
java.util.Random rnd)
Pseudorandomly generates, for the given input, a set of origins for this emitter. |
void |
generateRandomRays(Environment env,
Vector3f out,
Spectrum specOut,
RayList rays,
boolean adjoint,
java.util.Random rnd)
Pseudorandomly generates, for the given input, a set of scattered rays. |
int |
getAverageColor()
Returns an average color for the scattering entity. |
float |
getExponent()
|
int |
getFlags()
|
protected Node.NType |
getNTypeImpl()
This method returns the Node.NType which describes the managed
fields of the class of this node. |
float |
getRadius()
|
float[] |
getUVForVertex(Environment env,
Point3d vertex)
|
boolean |
isTwoSided()
|
protected Node |
newInstance()
This method returns a new instance of the class of this node. |
void |
pick(java.lang.Object object,
boolean asNode,
Point3d origin,
Vector3d direction,
Matrix4d t,
PickList list)
Computes intersections of a given ray with this shape. |
void |
setExponent(float value)
|
void |
setRadius(float value)
|
void |
setTwoSided(boolean value)
|
Methods inherited from class de.grogra.imp3d.objects.ColoredNull |
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getColor, setColor, setColor, setColor |
Methods inherited from class de.grogra.imp3d.objects.Null |
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getLocalTransformation, getTransform, getTranslation, isTransforming, postTransform, preTransform, setRotation, setScale, setTransform, setTransform, setTransform, setTransform, setTransform, setTransform, setTransform, setTransform, setTransforming, setTranslation |
Methods inherited from class de.grogra.graph.impl.Edge |
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addEdgeBits, getBitMark, getEdgeBits, getObjectMark, getSpecialEdgeDescriptor, parseEdgeKeys, remove, removeEdgeBits, setBitMark, setEdgeBits, setObjectMark, testEdgeBits |
Methods inherited from class java.lang.Object |
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equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait |
Methods inherited from interface de.grogra.persistence.PersistenceCapable |
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getBitMark, getObjectMark, setBitMark, setObjectMark |
Field Detail |
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public static final Node.NType $TYPE
protected float exponent
public static final Node.NType.Field exponent$FIELD
protected float radius
public static final Node.NType.Field radius$FIELD
protected boolean twoSided
public static final Node.NType.Field twoSided$FIELD
Constructor Detail |
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public SensorNode()
Method Detail |
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public double completeRay(Environment env, Point3d vertex, Ray out)
completeRay
in interface Emitter
public float computeBSDF(Environment env, Vector3f in, Spectrum specIn, Vector3f out, boolean adjoint, Spectrum bsdf)
Scattering
The computed spectrum is an integral over the spectrum of the following product:
env.point
,
ωi the (negated) direction of the incoming light ray,
νi the frequency where the incoming ray is sampled,
ωo the direction of the outgoing light ray,
νo the frequency where the outgoing ray is sampled,
and θ the angle between the surface normal and out
.
If adjoint
is false
, in
and
out
describe true light rays from light sources to sensors.
In this case, ωi = in
,
ωo = out
, and the integral is
bsdf
(ν) = |cos θ| ∫ BSDF(in
, νi;
out
, ν) specIn
(νi) dνi
adjoint
is true
. in
and
out
then describe importance rays (inverse light rays
from sensors to light sources). In this case,
ωi = out
,
ωo = in
, and the integral is
bsdf
(ν) = |cos θ| ∫
BSDF(out
, ν;
in
, νo) specIn
(νo) dνo
If this Scattering
instance is in fact a
Light
source, adjoint
is false
,
and the BSDF is defined as BSDF(in
, μ; ω, ν)
= L1(ω, ν) δ(μ - ν),
i.e., the directional distribution
of the emitted radiance at env.point
, see Emitter
.
In this case, in
is not used.
If this Scattering
instance is in fact a
Sensor
, adjoint
is true
,
and the BSDF is defined as BSDF(ω, ν; in
, μ)
= W1(ω, ν) δ(μ - ν),
i.e., the directional distribution
of the emitted importance at env.point
, see Emitter
.
In this case, in
is not used.
The computation should be physically valid. This excludes, e.g., ambient or emissive light contributions.
The returned value
is the value of the probability density pω
that would be calculated by Scattering.generateRandomRays(de.grogra.ray.physics.Environment, javax.vecmath.Vector3f, de.grogra.ray.physics.Spectrum, de.grogra.ray.util.RayList, boolean, java.util.Random)
if
the ray happened to be one of the randomly generated rays.
computeBSDF
in interface Scattering
env
- the environment for scatteringin
- the (negated) direction unit vector of the incoming ray
(i.e., pointing away from the surface)specIn
- the spectrum of the incoming rayout
- the direction unit vector of the outgoing ray
(i.e., pointing away from the surface)adjoint
- light ray or importance ray?bsdf
- the computed spectrum of the outgoing ray will be placed in here
public double computeExitance(Environment env, Spectrum exitance)
Emitter
env.point
in case of light sources, or the
corresponding function W0j(x, ν) in case
of sensors.
The returned value
is the value of the probability density px
that would be calculated by Emitter.generateRandomOrigins(de.grogra.ray.physics.Environment, de.grogra.ray.util.RayList, java.util.Random)
if
env.point
happened to be one of the randomly generated
origins.
computeExitance
in interface Emitter
env
- the environment for scatteringexitance
- the exitance values will be placed in here
public void draw(java.lang.Object object, boolean asNode, RenderState rs)
draw
in interface Renderable
public void generateRandomOrigins(Environment env, RayList out, java.util.Random rnd)
Emitter
At first, we consider the case where the emitter is in fact a light source. Let L(x, ω, ν) be the emitted spectral radiance for the frequency ν at the light's surface point x in direction ω. The radiant exitance (emitted spectral power per area) at x is defined as
rays.size
). Then
for a function f(x, ν) which is to be
integrated over the light surface, the sum
Now if the emitter is a sensor, let W(x, ω, ν) be the emitted spectral importance for frequency ν at the sensors's surface point x in direction ω. The quantities W0(x, ν) and W1(x, ω, ν) are defined similarly to the case of light sources:
Let px be the probability density used for the ray
origin, then the field originDensity
is set to px(oi) for each ray.
For emitters which are concentrated at a single point
(e.g., point lights) px is not
a regular function, the value originDensity
will
be set to a multiple of Scattering.DELTA_FACTOR
.
The ray properties which are not mentioned in the given formulas are neither used nor modified. These are the direction and its density.
generateRandomOrigins
in interface Emitter
env
- the environmentout
- the outgoing rays to be generatedrnd
- pseudorandom generatorpublic void generateRandomRays(Environment env, Vector3f out, Spectrum specOut, RayList rays, boolean adjoint, java.util.Random rnd)
Scattering
adjoint
is false
,
out
= ωo describes
the direction of an outgoing light ray.
In this case, the integration is with respect to ωi.
Let g(ω, ν; out
, μ)
= BSDF(ω, ν; out
, μ)
adjoint
is true
. In this case,
out
= ωi describes
the direction of an outgoing importance ray (an inverse light ray).
Now the integration is with respect to ωo.
Let g(ω, ν; out
, μ)
= BSDF(out
, μ; ω, ν)
rays.size
). Then, for every
frequency ν the sum
out
, μ)
specOut
(μ) dμ dω
If this Scattering
instance is in fact a
Light
source, adjoint
is true
,
and the BSDF is defined as BSDF(out
, μ; ω, ν)
= L1(ω, ν) δ(μ - ν),
i.e., the directional distribution
of the emitted radiance at env.point
, see Emitter
.
In this case, out
is not used.
If this Scattering
instance is in fact a
Sensor
, adjoint
is false
,
and the BSDF is defined as BSDF(ω, ν; out
, μ)
= W1(ω, ν) δ(μ - ν),
i.e., the directional distribution
of the emitted importance at env.point
, see Emitter
.
In this case, out
is not used.
Let pω be the probability density
used for the ray direction (measured with respect to
solid angle ω),
then the field directionDensity
of the ray i
is set to pω(di).
For ideal specular reflection or transmission, or for directional
lights or sensors, pω is not
a regular function, the value directionDensity
will
be set to a multiple of Scattering.DELTA_FACTOR
.
The ray properties which are not mentioned in the given formulas are neither used nor modified. These are the origin and its density.
generateRandomRays
in interface Scattering
env
- the environment for scatteringout
- the direction unit vector of the outgoing ray
(i.e., pointing away from the surface)specOut
- the spectrum of the outgoing rayrays
- the rays to be generatedadjoint
- represents out
a light ray or an importance ray?rnd
- pseudorandom generatorScattering.computeBSDF(de.grogra.ray.physics.Environment, javax.vecmath.Vector3f, de.grogra.ray.physics.Spectrum, javax.vecmath.Vector3f, boolean, de.grogra.ray.physics.Spectrum)
public int getAverageColor()
Scattering
getAverageColor
in interface Scattering
public float getExponent()
public int getFlags()
getFlags
in interface Scattering
protected Node.NType getNTypeImpl()
Node
Node.NType
which describes the managed
fields of the class of this node. This method has to be implemented
in every concrete subclass.
getNTypeImpl
in class Null
public float getRadius()
public float[] getUVForVertex(Environment env, Point3d vertex)
getUVForVertex
in interface Sensor
public boolean isTwoSided()
protected Node newInstance()
Node
newInstance
in class Null
public void pick(java.lang.Object object, boolean asNode, Point3d origin, Vector3d direction, Matrix4d t, PickList list)
Pickable
pick
in interface Pickable
object
- the object of which this shape is an attributeasNode
- true
iff object is a nodeorigin
- the origin of the ray, in local coordinatesdirection
- the direction of the ray, in local coordinatest
- the transformation from local coordinates to world coordinateslist
- the list to which intersections have to be addedpublic void setExponent(float value)
public void setRadius(float value)
public void setTwoSided(boolean value)
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