de.grogra.ray2

Interface Scene

All Known Implementing Classes:

SceneVisitor

public interface Scene

A Scene represents the complete geometry, shading, and lighting information which is needed for a raytracer. In addition, it defines the sensors within the scene for a radiation model.

Note that the methods are not thread-safe: For each additional thread, its own instance of Scene has to be created from the original instance via the method dup().

Author:

Ole Kniemeyer

Method Summary

Methods

Modifier and Type	Method and Description
void	appendStatistics(java.lang.StringBuffer stats) Appends some statistics information about the scene to stats.
boolean	computeIntersections(Line line, int which, IntersectionList list, Intersection excludeStart, Intersection excludeEnd) Computes intersections between the boundary surface of the objects of the scene and the specified line.
Spectrum	createSpectrum() This factory method creates a new spectrum which shall be used for light computations within the context of this scene.
Scene	dup() Returns a clone of this Scene.
BoundingBox	getBoundingBox() Returns a bounding box which contains all finite geometric objects of the scene.
java.lang.Object	getGraph() Returns an object identifying the underlying scene graph.
Interior	getInterior(Volume v) Returns the interior which is associated with volume v.
Matrix4d	getInverseLightTransformation(int light) Returns the affine light transformation from global world coordinates to local light coordinates for the light having index light in getLights().
Matrix4d	getInverseSensorTransformation(int sensor) Returns the affine sensor transformation from global world coordinates to local sensor coordinates for the sensor having index sensor in getSensors().
int	getLight(Volume v) Returns the index in getLights() of the light which is associated with volume v, or -1 if no such light exists.
Light[]	getLights() Returns an array of all lights in the scene.
Matrix4d	getLightTransformation(int light) Returns the affine light transformation from local light coordinates to global world coordinates for the light having index light in getLights().
OctreeUnion	getOctree()
int	getSensor(Volume v) Returns the index in getSensors() of the sensor which is associated with volume v, or -1 if no such sensor exists.
Sensor[]	getSensors() Returns an array of all sensors in the scene.
Matrix4d	getSensorTransformation(int sensor) Returns the affine sensor transformation from local sensor coordinates to global world coordinates for the sensor having index sensor in getSensors().
Shader	getShader(Volume v) Returns the shader which is associated with volume v.
int	getStamp() Returns a modification stamp for the underlying scene graph.
java.lang.String	getUniqueName() Returns a unique name for the current scene, so that the test whether two scenes are identical can be performed.
void	transform(Volume v, Tuple3d global, Tuple3d localOut) Transforms a point in global world coordinates to local object coordinates of the volume v.

Method Detail

appendStatistics

void appendStatistics(java.lang.StringBuffer stats)

Appends some statistics information about the scene to stats.

Parameters:

stats - buffer for statistics information

computeIntersections

boolean computeIntersections(Line line,
                           int which,
                           IntersectionList list,
                           Intersection excludeStart,
                           Intersection excludeEnd)

Computes intersections between the boundary surface of the objects of the scene and the specified line. For the precise behaviour and the meaning of the parameters, see Volume.computeIntersections(de.grogra.vecmath.geom.Line, int, de.grogra.vecmath.geom.IntersectionList, de.grogra.vecmath.geom.Intersection, de.grogra.vecmath.geom.Intersection).

Parameters:

line - a line

which - 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 list

excludeStart - intersection at start point which shall be excluded, or null

excludeEnd - intersection at end point which shall be excluded, or null

Returns:

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

See Also:

Volume.computeIntersections(de.grogra.vecmath.geom.Line, int, de.grogra.vecmath.geom.IntersectionList, de.grogra.vecmath.geom.Intersection, de.grogra.vecmath.geom.Intersection)

createSpectrum

Spectrum createSpectrum()

This factory method creates a new spectrum which shall be used for light computations within the context of this scene.

Returns:

new spectrum instance for use in computations

dup

Scene dup()

Returns a clone of this Scene. All constant variables which are related to the structure of the scene are copied shallowly, state variables are newly created without copying.

Returns:

clone of this scene

getBoundingBox

BoundingBox getBoundingBox()

Returns a bounding box which contains all finite geometric objects of the scene. The returned box must not be modified.

Returns:

bounding box of finite geometry

getGraph

java.lang.Object getGraph()

Returns an object identifying the underlying scene graph.

Returns:

scene graph

getInterior

Interior getInterior(Volume v)

Returns the interior which is associated with volume v.

Parameters:

v - a volume

Returns:

corresponding interior

getInverseLightTransformation

Matrix4d getInverseLightTransformation(int light)

Returns the affine light transformation from global world coordinates to local light coordinates for the light having index light in getLights().

Parameters:

light - index of light in getLights()

Returns:

inverse light transformation for light

See Also:

getLights()

getInverseSensorTransformation

Matrix4d getInverseSensorTransformation(int sensor)

Returns the affine sensor transformation from global world coordinates to local sensor coordinates for the sensor having index sensor in getSensors().

Parameters:

sensor - index of sensor in getSensors()

Returns:

inverse sensor transformation for sensor

See Also:

getSensors()

getLight

int getLight(Volume v)

Returns the index in getLights() of the light which is associated with volume v, or -1 if no such light exists.

Parameters:

v - a volume

Returns:

index of corresponding light in getLights()

getLights

Light[] getLights()

Returns an array of all lights in the scene. The returned array must not be modified. The corresponding coordinate transformations are obtained by getLightTransformation(int).

Returns:

array of all lights

getLightTransformation

Matrix4d getLightTransformation(int light)

Returns the affine light transformation from local light coordinates to global world coordinates for the light having index light in getLights().

Parameters:

light - index of light in getLights()

Returns:

light transformation for light

See Also:

getLights()

getOctree

OctreeUnion getOctree()

getSensor

int getSensor(Volume v)

Returns the index in getSensors() of the sensor which is associated with volume v, or -1 if no such sensor exists.

Parameters:

v - a volume

Returns:

index of corresponding sensor in getSensors()

getSensors

Sensor[] getSensors()

Returns an array of all sensors in the scene. The returned array must not be modified. The corresponding coordinate transformations are obtained by getSensorTransformation(int).

Returns:

array of all sensors

getSensorTransformation

Matrix4d getSensorTransformation(int sensor)

Returns the affine sensor transformation from local sensor coordinates to global world coordinates for the sensor having index sensor in getSensors().

Parameters:

sensor - index of sensor in getSensors()

Returns:

sensor transformation for sensor

See Also:

getSensors()

getShader

Shader getShader(Volume v)

Returns the shader which is associated with volume v.

Parameters:

v - a volume

Returns:

corresponding shader

getStamp

int getStamp()

Returns a modification stamp for the underlying scene graph. Each modification increments the value, so that the test whether some modification occured can be simply performed on values of the stamp.

Returns:

a stamp for the whole graph

getUniqueName

java.lang.String getUniqueName()

Returns a unique name for the current scene, so that the test whether two scenes are identical can be performed.

transform

void transform(Volume v,
             Tuple3d global,
             Tuple3d localOut)

Transforms a point in global world coordinates to local object coordinates of the volume v.

Parameters:

v - volume which defines the local object coordinates

global - input point in global world coordinates

localOut - output point in local object coordinates