de.jreality.tutorial.projects.ksurfaces

Class R3

java.lang.Object

de.jreality.tutorial.projects.ksurfaces.R3

public class R3
extends Object

This class provides simple static methods to do verctor calculation in R³. The vectors of R³ are represented by array of 3 doubles.

Constructor Summary

Constructors

Constructor and Description
R3()

Method Summary

Modifier and Type	Method and Description
static void	copy(double[] a, double[] target) target = a, copy the entries of a into target
static void	cross(double[] a, double[] b, double[] target) target = a x b, i.e., the cross product or vector product WARNING: This method fails when the target is same as one of its arguments.
static double	dot(double[] a, double[] b) <a,b>, i.e., the dot product or inner product
static void	minus(double[] a, double[] b, double[] target) target = a-b
static double	norm(double[] a) |a|, the length of a vector.
static double	normSquared(double[] a) |a|^2, the square of the length of a vector.
static void	plus(double[] a, double[] b, double[] target) target = a + b
static void	times(double s, double[] a, double[] target) target = s * a, product of a real with a vector
static void	zero(double[] target) target = 0, reset the three entries of target to 0

Methods inherited from class java.lang.Object

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

Constructor Detail

R3

public R3()

Method Detail

plus

public static final void plus(double[] a,
                              double[] b,
                              double[] target)

target = a + b

Parameters:

a - array of 3 doubles

b - array of 3 doubles

target - array of 3 doubles

minus

public static final void minus(double[] a,
                               double[] b,
                               double[] target)

target = a-b

Parameters:

a - array of 3 doubles

b - array of 3 doubles

target - array of 3 doubles

cross

public static final void cross(double[] a,
                               double[] b,
                               double[] target)

target = a x b, i.e., the cross product or vector product
WARNING: This method fails when the target is same as one of its arguments.

Parameters:

a - array of 3 doubles

b - array of 3 doubles

target - array of 3 doubles

copy

public static final void copy(double[] a,
                              double[] target)

target = a, copy the entries of a into target

Parameters:

a - array of 3 doubles

target - array of 3 doubles

zero

public static final void zero(double[] target)

target = 0, reset the three entries of target to 0

Parameters:

target - array of 3 doubles

dot

public static final double dot(double[] a,
                               double[] b)

<a,b>, i.e., the dot product or inner product

Parameters:

a - array of 3 doubles

b - array of 3 doubles

Returns:

the value of the dot product

times

public static final void times(double s,
                               double[] a,
                               double[] target)

target = s * a, product of a real with a vector

Parameters:

s - the scalar real

a - array of 3 doubles

target - array of 3 doubles

norm

public static double norm(double[] a)

|a|, the length of a vector.

Parameters:

a - array of 3 doubles

Returns:

the length of a

normSquared

public static double normSquared(double[] a)

|a|^2, the square of the length of a vector.

Parameters:

a - array of 3 doubles

Returns:

the square of the length of a