CORD2S

Bulk Data Entry

CORD2S – Spherical Coordinate System Definition, Form 2

Description

Defines a spherical coordinate system by reference to the coordinates of three points. The first point defines the origin. The second point defines the direction of the z-axis. The third lies in the plane of the azimuthal origin.

Format

(1)	(2)	(3)	(4)	(5)	(6)	(7)	(8)	(9)	(10)
CORD2S	CID		A1	A2	A3	B1	B2	B3
	C1	C2	C3

Example

(1)	(2)	(3)	(4)	(5)	(6)	(7)	(8)	(9)	(10)
CORD2S	3		-2.9	1.0	0.0	3.6	0.0	1.0
	5.2	1.0	-2.9

Field

Contents

CID

Unique coordinate system identification number.

(Integer > 0)

A1,A2,A3
B1,B2,B3
C1,C2,C3

Coordinates of three points in the basic coordinate system.

(Real)

$image\bmp00017.gif$

CORD2S definition.

Comments

Continuation must be present.
The three points (A1, A2, A3), (B1, B2, B3), (C1, C2, C3) must be unique and noncollinear. Noncollinearity is checked by the geometry processor.
Coordinate system identification numbers on all CORD1R, CORD1C, CORD1S, CORD2R, CORD2C, and CORD2S entries must all be unique.
The location of a grid point (P in the sketch) in this coordinate system is given by
(R, $image\theta.gif$ , $image\phi.gif$ ). Where $image\theta.gif$ and $image\phi.gif$ are measured in degrees.
The displacement coordinate directions at P are shown by (ur, u $image\theta.gif$ , u $image\phi.gif$ ).
Points on the polar axis may not have their displacement directions defined in this coordinate system since ambiguity results.

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