Package com.ijurnove.cpu3d

Class PointLight

java.lang.Object

com.ijurnove.cpu3d.Light

com.ijurnove.cpu3d.PointLight

All Implemented Interfaces:

Rotatable, Scalable, Translatable

public class PointLight
extends Light
implements Translatable, Rotatable, Scalable

PointLight extends the abstract class Light. A PointLight illuminates the area around it. Shadow calculations are significantly more expensive than DirectionalLights, as shadows must be calculated in all six directions.

PointLight have a decayPow field that specifies how fast the light should decay as it gets farther away from the source. For each illuminated point, the diffuse and specular light values are divided by the distance from the light source raised to the power of decayPow. The default value is 3. PointLights can be translated, rotated, and scaled.

Constructor Summary

Constructors

Constructor	Description
PointLight(Point3d pos, PhongComponents components)	Constructs a PointLight with a specified position and PhongComponents.

Method Summary

Modifier and Type	Method	Description
protected double	distance(Vector3d lightVec)
double	getDecay()	Returns the decay exponent.
Point3d	getPos()	Returns the position as a Point3d.
protected void	init()
protected Vector3d	lightVec(Point3d point)
void	rotate(int axis, double theta, Point3d point)	Rotates this object about a given point on a specified axis.
void	scale(double size, Point3d point)	Scales this object by a given amount from a point.
void	setDecay(double decay)	Sets the decay exponent.
protected double	shadowValue(Point3d point)
void	translate(double x, double y, double z)	Shifts this object's X, Y, and Z position by the given values.
protected void	updateShadowMap()

Methods inherited from class com.ijurnove.cpu3d.Light

getComponents, getParent, getType, setComponents, setParent

Methods inherited from class java.lang.Object

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

Methods inherited from interface com.ijurnove.cpu3d.Translatable

translate

Constructor Details

PointLight

public PointLight(Point3d pos,
 PhongComponents components)

Constructs a PointLight with a specified position and PhongComponents.

Parameters:

pos - the specified position

components - the specified PhongComponents

Method Details

getPos

public Point3d getPos()

Returns the position as a Point3d.

Returns:

the position of this PointLight

init

protected void init()

setDecay

public void setDecay(double decay)

Sets the decay exponent.

Parameters:

decay - the decay exponent

getDecay

public double getDecay()

Returns the decay exponent.

Returns:

the decay exponent

updateShadowMap

protected void updateShadowMap()

shadowValue

protected double shadowValue(Point3d point)

lightVec

protected Vector3d lightVec(Point3d point)

distance

protected double distance(Vector3d lightVec)

translate

public void translate(double x,
 double y,
 double z)

Description copied from interface: Translatable

Shifts this object's X, Y, and Z position by the given values.

Specified by:

translate in interface Translatable

Parameters:

x - how far the object should be translated along the X axis

y - how far the object should be translated along the Y axis

z - how far the object should be translated along the Z axis

rotate

public void rotate(int axis,
 double theta,
 Point3d point)

Description copied from interface: Rotatable

Rotates this object about a given point on a specified axis. 0 corresponds to the X axis, 1 corresponds to the Y axis, and 2 corresponds to the Z axis.

Specified by:

rotate in interface Rotatable

Parameters:

axis - the axis to rotate around

theta - the radians to rotate by

point - the center point to rotate around

scale

public void scale(double size,
 Point3d point)

Description copied from interface: Scalable

Scales this object by a given amount from a point.

Specified by:

scale in interface Scalable

Parameters:

size - the scale multiplier

point - the point that this object should be scaled from