java.lang.Object
- org.sunflow.core.light.SunSkyLight

All Implemented Interfaces:: LightSource, PrimitiveList, RenderObject, Shader

public class SunSkyLight
extends java.lang.Object
implements LightSource, PrimitiveList, Shader

Field Summary

Fields
Modifier and Type	Field	Description
`private OrthoNormalBasis`	`basis`
`private float[]`	`colHistogram`
`private Color`	`groundColor`
`private boolean`	`groundExtendSky`
`private float[][]`	`imageHistogram`
`private float`	`jacobian`
`private static float[]`	`k_gAmplitudes`
`private static IrregularSpectralCurve`	`k_gCurve`
`private static float[]`	`k_gWavelengths`
`private static float[]`	`k_oAmplitudes`
`private static IrregularSpectralCurve`	`k_oCurve`
`private static float[]`	`k_oWavelengths`
`private static float[]`	`k_waAmplitudes`
`private static IrregularSpectralCurve`	`k_waCurve`
`private static float[]`	`k_waWavelengths`
`private int`	`numSkySamples`
`private double[]`	`perezx`
`private double[]`	`perezy`
`private double[]`	`perezY`
`private static float[]`	`solAmplitudes`
`private static RegularSpectralCurve`	`solCurve`
`private Color`	`sunColor`
`private Vector3`	`sunDir`
`private Vector3`	`sunDirWorld`
`private SpectralCurve`	`sunSpectralRadiance`
`private float`	`sunTheta`
`private float`	`turbidity`
`private double`	`zenithx`
`private double`	`zenithy`
`private double`	`zenithY`

Constructor Summary

Constructors
Constructor Description

SunSkyLight()

Method Summary

All Methods Instance Methods Concrete Methods
Modifier and Type	Method	Description
`private SpectralCurve`	`computeAttenuatedSunlight(float theta, float turbidity)`
`Instance`	`createInstance()`	Create an instance which represents the geometry of this light source.
`PrimitiveList`	`getBakingPrimitives()`	Create a new `PrimitiveList` object suitable for baking lightmaps.
`private Vector3`	`getDirection(float u, float v)`
`int`	`getNumPrimitives()`	Returns the number of individual primtives in this aggregate object.
`int`	`getNumSamples()`	Get the maximum number of samples that can be taken from this light source.
`Color`	`getOpacity(ShadingState state)`	Returns how much light is blocked by this shader.
`void`	`getPhoton(double randX1, double randY1, double randX2, double randY2, Point3 p, Vector3 dir, Color power)`	Gets a photon to emit from this light source by setting each of the arguments.
`float`	`getPower()`	Get the total power emitted by this light source.
`float`	`getPrimitiveBound(int primID, int i)`	Retrieve the bounding box component of a particular primitive in object space.
`Color`	`getRadiance(ShadingState state)`	Gets the radiance for a specified rendering state.
`void`	`getSamples(ShadingState state)`	Samples the light source to compute direct illumination.
`private Color`	`getSkyRGB(Vector3 dir)`
`Color`	`getSunColor()`
`BoundingBox`	`getWorldBounds(Matrix4 o2w)`	Compute a bounding box of this object in world space, using the specified object-to-world transformation matrix.
`private void`	`initSunSky()`
`void`	`intersectPrimitive(Ray r, int primID, IntersectionState state)`	Intersect the specified primitive in local space.
`boolean`	`isOpaque()`	Returns `true` if this shader is fully opaque.
`private double`	`perezFunction(double[] lam, double theta, double gamma, double lvz)`
`void`	`prepareShadingState(ShadingState state)`	Prepare the specified `ShadingState` by setting all of its internal parameters.
`void`	`scatterPhoton(ShadingState state, Color power)`	Scatter a photon with the specied power.
`boolean`	`update(ParameterList pl, SunflowAPI api)`	Update this object given a list of parameters.

Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

- Field Detail
  - numSkySamples
```
private int numSkySamples
```
  - basis
```
private OrthoNormalBasis basis
```
  - groundExtendSky
```
private boolean groundExtendSky
```
  - groundColor
```
private Color groundColor
```
  - sunDirWorld
```
private Vector3 sunDirWorld
```
  - turbidity
```
private float turbidity
```
  - sunDir
```
private Vector3 sunDir
```
  - sunSpectralRadiance
```
private SpectralCurve sunSpectralRadiance
```
  - sunColor
```
private Color sunColor
```
  - sunTheta
```
private float sunTheta
```
  - zenithY
```
private double zenithY
```
  - zenithx
```
private double zenithx
```
  - zenithy
```
private double zenithy
```
  - perezY
```
private final double[] perezY
```
  - perezx
```
private final double[] perezx
```
  - perezy
```
private final double[] perezy
```
  - jacobian
```
private float jacobian
```
  - colHistogram
```
private float[] colHistogram
```
  - imageHistogram
```
private float[][] imageHistogram
```
  - solAmplitudes
```
private static final float[] solAmplitudes
```
  - solCurve
```
private static final RegularSpectralCurve solCurve
```
  - k_oWavelengths
```
private static final float[] k_oWavelengths
```
  - k_oAmplitudes
```
private static final float[] k_oAmplitudes
```
  - k_gWavelengths
```
private static final float[] k_gWavelengths
```
  - k_gAmplitudes
```
private static final float[] k_gAmplitudes
```
  - k_waWavelengths
```
private static final float[] k_waWavelengths
```
  - k_waAmplitudes
```
private static final float[] k_waAmplitudes
```
  - k_oCurve
```
private static final IrregularSpectralCurve k_oCurve
```
  - k_gCurve
```
private static final IrregularSpectralCurve k_gCurve
```
  - k_waCurve
```
private static final IrregularSpectralCurve k_waCurve
```
- Constructor Detail
  - SunSkyLight
```
public SunSkyLight()
```
- Method Detail
  - computeAttenuatedSunlight
```
private SpectralCurve computeAttenuatedSunlight(float theta,
                                                float turbidity)
```
  - perezFunction
```
private double perezFunction(double[] lam,
                             double theta,
                             double gamma,
                             double lvz)
```
  - initSunSky
```
private void initSunSky()
```
  - update
```
public boolean update(ParameterList pl,
                      SunflowAPI api)
```
    Description copied from interface: RenderObject
    
    Update this object given a list of parameters. This method is guarenteed to be called at least once on every object, but it should correctly handle empty parameter lists. This means that the object should be in a valid state from the time it is constructed. This method should also return true or false depending on whether the update was succesfull or not.
    
    Specified by:
    
    update in interface RenderObject
    
    Parameters:
    
    pl - list of parameters to read from
    
    api - reference to the current scene
    
    Returns:
    
    true if the update is succesfull, false otherwise
  - getSkyRGB
```
private Color getSkyRGB(Vector3 dir)
```
  - getNumSamples
```
public int getNumSamples()
```
    Description copied from interface: LightSource
    
    Get the maximum number of samples that can be taken from this light source. This is currently only used for statistics reporting.
    
    Specified by:
    
    getNumSamples in interface LightSource
    
    Returns:
    
    maximum number of samples to be taken from this light source
  - getPhoton
```
public void getPhoton(double randX1,
                      double randY1,
                      double randX2,
                      double randY2,
                      Point3 p,
                      Vector3 dir,
                      Color power)
```
    Description copied from interface: LightSource
    
    Gets a photon to emit from this light source by setting each of the arguments. The two sampling parameters are points on the unit square that can be used to sample a position and/or direction for the emitted photon.
    
    Specified by:
    
    getPhoton in interface LightSource
    
    Parameters:
    
    randX1 - sampling parameter
    
    randY1 - sampling parameter
    
    randX2 - sampling parameter
    
    randY2 - sampling parameter
    
    p - position to shoot the photon from
    
    dir - direction to shoot the photon in
    
    power - power of the photon
  - getPower
```
public float getPower()
```
    Description copied from interface: LightSource
    
    Get the total power emitted by this light source. Lights that have 0 power will not emit any photons.
    
    Specified by:
    
    getPower in interface LightSource
    
    Returns:
    
    light source power
  - getSamples
```
public void getSamples(ShadingState state)
```
    Description copied from interface: LightSource
    
    Samples the light source to compute direct illumination. Light samples can be created using the LightSample class and added to the current ShadingState. This method is responsible for the shooting of shadow rays which allows for non-physical lights that don't cast shadows. It is recommended that only a single shadow ray be shot if ShadingState.getDiffuseDepth() is greater than 0. This avoids an exponential number of shadow rays from being traced.
    
    Specified by:
    
    getSamples in interface LightSource
    
    Parameters:
    
    state - current state, including point to be shaded
    
    See Also:
    
    LightSample
  - getBakingPrimitives
```
public PrimitiveList getBakingPrimitives()
```
    Description copied from interface: PrimitiveList
    
    Create a new PrimitiveList object suitable for baking lightmaps. This means a set of primitives laid out in the unit square UV space. This method is optional, objects which do not support it should simply return null.
    
    Specified by:
    
    getBakingPrimitives in interface PrimitiveList
    
    Returns:
    
    a list of baking primitives
  - getNumPrimitives
```
public int getNumPrimitives()
```
    Description copied from interface: PrimitiveList
    
    Returns the number of individual primtives in this aggregate object.
    
    Specified by:
    
    getNumPrimitives in interface PrimitiveList
    
    Returns:
    
    number of primitives
  - getPrimitiveBound
```
public float getPrimitiveBound(int primID,
                               int i)
```
    Description copied from interface: PrimitiveList
    
    Retrieve the bounding box component of a particular primitive in object space. Even indexes get minimum values, while odd indexes get the maximum values for each axis.
    
    Specified by:
    
    getPrimitiveBound in interface PrimitiveList
    
    Parameters:
    
    primID - primitive index
    
    i - bounding box side index
    
    Returns:
    
    value of the request bound
  - getWorldBounds
```
public BoundingBox getWorldBounds(Matrix4 o2w)
```
    Description copied from interface: PrimitiveList
    
    Compute a bounding box of this object in world space, using the specified object-to-world transformation matrix. The bounds should be as exact as possible, if they are difficult or expensive to compute exactly, you may use Matrix4.transform(BoundingBox). If the matrix is null no transformation is needed, and object space is equivalent to world space.
    
    Specified by:
    
    getWorldBounds in interface PrimitiveList
    
    Parameters:
    
    o2w - object to world transformation matrix
    
    Returns:
    
    object bounding box in world space
  - intersectPrimitive
```
public void intersectPrimitive(Ray r,
                               int primID,
                               IntersectionState state)
```
    Description copied from interface: PrimitiveList
    
    Intersect the specified primitive in local space.
    
    Specified by:
    
    intersectPrimitive in interface PrimitiveList
    
    Parameters:
    
    r - ray in the object's local space
    
    primID - primitive index to intersect
    
    state - intersection state
    
    See Also:
    
    Ray.setMax(float), IntersectionState.setIntersection(int, float, float)
  - prepareShadingState
```
public void prepareShadingState(ShadingState state)
```
    Description copied from interface: PrimitiveList
    
    Prepare the specified ShadingState by setting all of its internal parameters.
    
    Specified by:
    
    prepareShadingState in interface PrimitiveList
    
    Parameters:
    
    state - shading state to fill in
  - getRadiance
```
public Color getRadiance(ShadingState state)
```
    Description copied from interface: Shader
    
    Gets the radiance for a specified rendering state. When this method is called, you can assume that a hit has been registered in the state and that the hit surface information has been computed.
    
    Specified by:
    
    getRadiance in interface Shader
    
    Parameters:
    
    state - current render state
    
    Returns:
    
    color emitted or reflected by the shader
  - getSunColor
```
public Color getSunColor()
```
  - scatterPhoton
```
public void scatterPhoton(ShadingState state,
                          Color power)
```
    Description copied from interface: Shader
    
    Scatter a photon with the specied power. Incoming photon direction is specified by the ray attached to the current render state. This method can safely do nothing if photon scattering is not supported or relevant for the shader type.
    
    Specified by:
    
    scatterPhoton in interface Shader
    
    Parameters:
    
    state - current state
    
    power - power of the incoming photon.
  - getDirection
```
private Vector3 getDirection(float u,
                             float v)
```
  - createInstance
```
public Instance createInstance()
```
    Description copied from interface: LightSource
    
    Create an instance which represents the geometry of this light source. This instance will be created just before and removed immediately after rendering. Non-area light sources can return null to indicate that no geometry needs to be created.
    
    Specified by:
    
    createInstance in interface LightSource
    
    Returns:
    
    an instance describing the light source
  - isOpaque
```
public boolean isOpaque()
```
    Description copied from interface: Shader
    
    Returns true if this shader is fully opaque. This gives a quick way to find out if a shader needs further processing when hit by a shadow ray.
    
    Specified by:
    
    isOpaque in interface Shader
  - getOpacity
```
public Color getOpacity(ShadingState state)
```
    Description copied from interface: Shader
    
    Returns how much light is blocked by this shader.
    
    Specified by:
    
    getOpacity in interface Shader

Class SunSkyLight

Field Summary

Constructor Summary

Method Summary

Methods inherited from class java.lang.Object

Field Detail

numSkySamples

basis

groundExtendSky

groundColor

sunDirWorld

turbidity

sunDir

sunSpectralRadiance

sunColor

sunTheta

zenithY

zenithx

zenithy

perezY

perezx

perezy

jacobian

colHistogram

imageHistogram

solAmplitudes

solCurve

k_oWavelengths

k_oAmplitudes

k_gWavelengths

k_gAmplitudes

k_waWavelengths

k_waAmplitudes

k_oCurve

k_gCurve

k_waCurve

Constructor Detail

SunSkyLight

Method Detail

computeAttenuatedSunlight

perezFunction

initSunSky

update

getSkyRGB

getNumSamples

getPhoton

getPower

getSamples

getBakingPrimitives

getNumPrimitives

getPrimitiveBound

getWorldBounds

intersectPrimitive

prepareShadingState

getRadiance

getSunColor

scatterPhoton

getDirection

createInstance

isOpaque

getOpacity