Vec3D Functions

API functions that utilize the vec3d class are grouped here. For details of the class, including member functions, see vec3d.

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Functions
double	dist (const vec3d &in a, const vec3d &in b)
double	dist_squared (const vec3d &in a, const vec3d &in b)
double	dot (const vec3d &in a, const vec3d &in b)
vec3d	cross (const vec3d &in a, const vec3d &in b)
double	angle (const vec3d &in a, const vec3d &in b)
double	signed_angle (const vec3d &in a, const vec3d &in b, const vec3d &in ref)
vec3d	RotateArbAxis (const vec3d &in p, double theta, const vec3d &in axis)

Detailed Description

Function Documentation

angle()

double angle	(	const vec3d &in	a,
		const vec3d &in	b
	)

Calculate the angle between two vec3d inputs (dot product divided by their magnitudes multiplied)

//==== Test Vec3d ====//
vec3d a(), b();                                // Default Constructor

//==== Test Angle ====//
a.set_xyz( 1.0, 1.0, 0.0 );
b.set_xyz( 1.0, 0.0, 0.0 );

if ( abs( angle( a, b ) - PI / 4 ) > 1e-6 )                    { Print( "---> Error: Vec3d Angle " ); }

Parameters

[in]	a	First vec3d
[in]	b	Second vec3d

Returns

Angle in Radians

cross()

vec3d cross	(	const vec3d &in	a,
		const vec3d &in	b
	)

Calculate the cross product between two vec3d inputs

//==== Test Vec3d ====//
vec3d a(), b(), c();                                // Default Constructor

//==== Test Cross ====//
a.set_xyz( 4.0, 0.0, 0.0 );
b.set_xyz( 0.0, 3.0, 0.0 );

c = cross( a, b );

c.normalize();

Parameters

[in]	a	First vec3d
[in]	b	Second vec3d

Returns

Cross product

dist()

double dist	(	const vec3d &in	a,
		const vec3d &in	b
	)

Calculate the distance between two vec3d inputs

//==== Test Vec3d ====//
vec3d a(), b();                                // Default Constructor

//==== Test Dist ====//
a.set_xyz( 2.0, 2.0, 2.0 );
b.set_xyz( 3.0, 4.0, 5.0 );

double d = dist( a, b );

if ( abs( d - sqrt( 14 ) ) > 1e-6 )    { Print( "---> Error: Vec3d Dist " ); }

See also

dist_squared

Parameters

[in]	a	First vec3d
[in]	b	Second vec3d

Returns

Distance

dist_squared()

double dist_squared	(	const vec3d &in	a,
		const vec3d &in	b
	)

Calculate distance squared between two vec3d inputs

//==== Test Vec3d ====//
vec3d a(), b();                                // Default Constructor

//==== Test Dist ====//
a.set_xyz( 2.0, 2.0, 2.0 );
b.set_xyz( 3.0, 4.0, 5.0 );

double d2 = dist_squared( a, b );

if ( abs( d2 - 14 ) > 1e-6 )    { Print( "---> Error: Vec3d Dist " ); }

See also

dist

Parameters

[in]	a	First vec3d
[in]	b	Second vec3d

Returns

Distance squared

dot()

double dot	(	const vec3d &in	a,
		const vec3d &in	b
	)

Calculate the dot product between two vec3d inputs

//==== Test Vec3d ====//
vec3d a(), b();                                // Default Constructor

//==== Test Dot ====//
a.set_xyz( 1.0, 2.0, 3.0 );
b.set_xyz( 2.0, 3.0, 4.0 );

if ( abs( dot( a, b ) - 20 ) > 1e-6 )                            { Print( "---> Error: Vec3d Dot " ); }

Parameters

[in]	a	First vec3d
[in]	b	Second vec3d

Returns

Dot product

RotateArbAxis()

vec3d RotateArbAxis	(	const vec3d &in	p,
		double	theta,
		const vec3d &in	axis
	)

Calculate the cosine of angle between two vec3d inputs
\code{.cpp}
vec3d pnt = vec3d( 2, 4, 6);

vec3d line_pt1(), line_pt2();

line_pt1.set_z( 4 );
line_pt2.set_y( 3 );

vec3d p_ln1 = pnt - line_pt1;

vec3d ln2_ln1 = line_pt2 - line_pt1;

double numer =  cos_angle( p_ln1, ln2_ln1 ) * p_ln1.mag();
\sa angle
\param [in] a First vec3d
\param [in] b Second vec3d
\return Angle in Radians

*/ double cos_angle(const vec3d&in a, const vec3d&in b);

/*!

*/

/*! Rotate a input point by specified angle around an arbitrary axis. Assume right hand coordinate system

//==== Test Vec3d ====//
vec3d a(), b(), c();                                // Default Constructor

//==== Test Rotate ====//
a.set_xyz( 1.0, 1.0, 0.0 );
b.set_xyz( 1.0, 0.0, 0.0 );
c.set_xyz( 0.0, 0.0, 1.0 );

c = RotateArbAxis( b, PI, a );

Parameters

[in]	p	Coordinate point to rotate
[in]	theta	Angle of rotation in Radians
[in]	axis	Reference axis for rotation

Returns

Coordinates of rotated point

signed_angle()

double signed_angle	(	const vec3d &in	a,
		const vec3d &in	b,
		const vec3d &in	ref
	)

Calculate the signed angle between two vec3d inputs (dot product divided by their magnitudes multiplied) and an input reference axis

//==== Test Vec3d ====//
vec3d a(), b(), c();                                // Default Constructor

//==== Test Angle ====//
a.set_xyz( 1.0, 1.0, 0.0 );
b.set_xyz( 1.0, 0.0, 0.0 );
c.set_xyz( 0.0, 0.0, 1.0 );

if ( abs( signed_angle( a, b, c ) - -PI / 4 ) > 1e-6 )            { Print( "---> Error: Vec3d SignedAngle " ); }

Parameters

[in]	a	First vec3d
[in]	b	Second vec3d
[in]	ref	Reference axis

Returns

Angle in Radians