NAME

GDX_REV_SURF - Revolved Surface

GENERAL DESCRIPTION

A GDX Revolved Surface parametrically defines a revolved surface using an axis of revolution (defined by a point and direction), a curve to be revolved, and start and end angles.

DDF SPECIFICATION

entity 13:0   GDX_REV_SURF   "Revolved Surface" {



double
REVOLVE_PNT[3];



double
REVOLVE_VEC[3];



double
START_ANGLE;



double
END_ANGLE;



ptr
GEN_CURVE
reftype = (P_CURVES);


};

FIELD DESCRIPTIONS

REVOLVE_PNT

A 3D array containing the X, Y, and Z coordinates of a point on the axis of revolution.

REVOLVE_VEC

A 3D array containing the X, Y, and Z coordinates of the axis of revolution.

START_ANGLE

The start angle in radians.

END_ANGLE

The end angle in radians.

GEN_CURVE

The database pointer of the GDX curve corresponding to the curve to be revolved. The allowable GDX entity type/forms consists of the parametrically defined GDX curve entities as defined by the P_CURVES ptrlist variable in gdx.ddf. For reference, these entities are:

GDX_CONIC

GDX_NURB_CURVE

GDX_ARC

GDX_SPLINE_CURVE

GDX_POLYLINE

GDX_COMP_CURVE

GDX_OFFSET_CURVE

GDX_TRIM_CURVE

PARAMETERIZATION

The parameterization is the same as that used for the IGES Surface of Revolution Entity (Type 120) and can be found in Section 4.16 of The Initial Graphics Exchange Specification (IGES) Version 5.2.

PARAMETRIC RANGE

The GDX Revolved Surface is defined over the following parametric range: u0 <= u <= u1 START_ANGLE <= v <= END_ANGLE

   where u0 and u1 are parametric bounds of the curve to be revolved.

RESTRICTIONS

The GDX Revolved Surface is subject to the following restrictions: START_ANGLE < END_ANGLE <= START_ANGLE + MTH_2_PI

double	REVOLVE_PNT[3];
double	REVOLVE_VEC[3];
double	START_ANGLE;
double	END_ANGLE;
ptr	GEN_CURVE	reftype = (P_CURVES);