ROTATE Y(3P) — SUNPHIGS LIBRARY

NAME

ROTATE Y − calculate a 3D transformation matrix to perform a specified rotation about the y axis.

SYNOPSIS

C Syntax

void
protatey ( angle, error_ind, matrix )
Pfloatangle;rotation angle
Pint∗error_ind;OUT error indicator
Pmatrix3matrix;OUT transformation matrix

FORTRAN Syntax

SUBROUTINE proy ( ROTANG, ERRIND, XFRMT )
REALROTANGrotation angle in radians (positive
if anticlockwise)
INTEGERERRINDOUT error indicator
REALXFRMT(4, 4)OUT transformation matrix

Required PHIGS Operating States

(PHOP, ∗, ∗, ∗)

DESCRIPTION

Purpose

Use ROTATE Y to generate a 3D homogeneous (4 x 4) transformation matrix that performs a 3D rotation about the y axis.

The returned matrix may be passed as an argument to SET LOCAL TRANSFORMATION 3 or SET GLOBAL TRANSFORMATION 3 to modify the modelling transformation that is applied to output primitives during traversal.

C Input Parameter

angleThe angle of the rotation in radians. Positive angles indicate counter-clockwise rotation, negative angles indicate clockwise rotation.

C Output Parameters

error_ind
A pointer to the location to store the error number of any error detected by this function.

matrix
The 4 x 4 homogeneous transformation matrix that performs the specified rotation. Pmatrix3 is defined in phigs.h as follows:

typedef Pfloat Pmatrix3[4][4];

FORTRAN Input Parameter

ROTANG
The angle of the rotation in radians. Positive angles indicate counter-clockwise rotation, negative angles indicate clockwise rotation.

FORTRAN Output Parameters

ERRIND
The error number of any error detected by this function.

XFRMT
The 4 x 4 homogeneous transformation matrix that performs the specified rotation.

Execution

ROTATE Y returns the 3D homogeneous (4 x 4) transformation matrix that performs the rotation specified by angle about the y axis. The rotation is specified in radians and is relative to the origin of the current modelling coordinate system.

ERRORS

002Ignoring function, function requires state (PHOP, ∗, ∗, ∗)

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