STEP file formatting

We're trying to convert OpenGL based models to STEP files so Solidworks can import them. We already have the option to save these OpenGL models as IGES and 2D DXF files. The documentation is tough going, we have some results but Solidworks is giving errors.

Here is a sample made with the translator tool, a simple square panel and a plane.

ISO-10303-21;

HEADER;

FILE_DESCRIPTION (('SYNOPSYS lens drawing'),'2';1);

FILE_NAME (TEST.STEP,'',(),(),SwSTEP 2.0','SYNOPSYS','' );

FILE_SCHEMA (( 'CONFIG_CONTROL_DESIGN' ));

ENDSEC;

DATA;

#1 = CARTESIAN_POINT ( 'NONE', ( -10, 10, 0 ) ) ;

#2 = CARTESIAN_POINT ( 'NONE', ( 10, 10, 0 ) ) ;

#3 = CARTESIAN_POINT ( 'NONE', ( 10, -10, 0 ) ) ;

#4 = CARTESIAN_POINT ( 'NONE', ( -10, -10, 0 ) ) ;

#5 = VERTEX_POINT ( '', #1 );

#6 = VERTEX_POINT ( '', #2 );

#7 = VERTEX_POINT ( '', #3 );

#8 = VERTEX_POINT ( '', #4 );

#10 = POLYLINE( '', #5, #6, #7, #8, #5 );

#16 = PLANE( '', #15 );

#15 = AXIS2_PLACEMENT ( '', #12, #13, #14 ) ;

#12 = CARTESIAN_POINT ( '', ( 0, 0, 0 ) ) ;

#13 = DIRECTION ( '', ( 1, 0, 0 ) ) ;

#14 = DIRECTION ( '', ( 0, 1, 0 ) ) ;

#20 = FACE_BOUND( '', #21, .T. );

#21 = EDGE_LOOP( '', #22 );

#22 = ORIENTED_EDGE( '', #23 );

#23 = EDGE_CURVE( '', #5, #6, #24 );

#24 = LINE( '', #1, #25 );

#25 = VECTOR( '', #14, .77 );

#30 = SHAPE_REPRESENTATION('',(#10, #16);

ENDSEC;

END-ISO-10303-21;

This file will open in eDrawings but only display the square panel. Solidworks won't open it at all and gives the following error -

Error: Incomplete file.