0000363: Problem exporting in STEP format - FreeCAD Tracker

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ID	Project	Category	View Status	Date Submitted	Last Update

0000363	FreeCAD	Bug	public	2011-05-28 01:20	2011-05-30 12:02

Reporter	unauthenticated	Assigned To
Priority	normal	Severity	minor	Reproducibility	always
Status	closed	Resolution	fixed
Product Version	0.11
Fixed in Version	0.12

Summary	0000363: Problem exporting in STEP format
Description	Hi, I'm importing a triangle mesh (containing faces, vertices, normals, and indices) of .obj format to freeCAD, and then I export it to STEP format. And what I got is only few information and there's no geometry information in the exported file : ISO-10303-21; HEADER; FILE_DESCRIPTION(('FreeCAD Model'),'2;1'); FILE_NAME('D:/Home/EonStrife/fromFREECAD.stp','2011-05-28T10:36:02',( 'FreeCAD'),('FreeCAD'),'Open CASCADE STEP processor 6.3','FreeCAD', 'Unknown'); FILE_SCHEMA(('AUTOMOTIVE_DESIGN_CC2 { 1 2 10303 214 -1 1 5 4 }')); ENDSEC; DATA; #1 = APPLICATION_PROTOCOL_DEFINITION('committee draft', 'automotive_design',1997,0000002); 0000002 = APPLICATION_CONTEXT( 'core data for automotive mechanical design processes'); 0000003 = SHAPE_DEFINITION_REPRESENTATION(0000004,0000010); 0000004 = PRODUCT_DEFINITION_SHAPE('','',0000005); 0000005 = PRODUCT_DEFINITION('design','',0000006,0000009); 0000006 = PRODUCT_DEFINITION_FORMATION('','',0000007); 0000007 = PRODUCT('Open CASCADE STEP translator 6.3 1', 'Open CASCADE STEP translator 6.3 1','',(0000008)); 0000008 = MECHANICAL_CONTEXT('',0000002,'mechanical'); 0000009 = PRODUCT_DEFINITION_CONTEXT('part definition',0000002,'design'); 0000010 = SHAPE_REPRESENTATION('',(0000011),0000015); 0000011 = AXIS2_PLACEMENT_3D('',0000012,0000013,0000014); 0000012 = CARTESIAN_POINT('',(0.E+000,0.E+000,0.E+000)); 0000013 = DIRECTION('',(0.E+000,0.E+000,1.)); 0000014 = DIRECTION('',(1.,0.E+000,-0.E+000)); 0000015 = ( GEOMETRIC_REPRESENTATION_CONTEXT(3) GLOBAL_UNCERTAINTY_ASSIGNED_CONTEXT((0000019)) GLOBAL_UNIT_ASSIGNED_CONTEXT( (0000016,0000017,0000018)) REPRESENTATION_CONTEXT('Context #1', '3D Context with UNIT and UNCERTAINTY') ); 0000016 = ( LENGTH_UNIT() NAMED_UNIT() SI_UNIT(.MILLI.,.METRE.) ); 0000017 = ( NAMED_UNIT() PLANE_ANGLE_UNIT() SI_UNIT($,.RADIAN.) ); 0000018 = ( NAMED_UNIT(*) SI_UNIT($,.STERADIAN.) SOLID_ANGLE_UNIT() ); 0000019 = UNCERTAINTY_MEASURE_WITH_UNIT(LENGTH_MEASURE(1.E-007),0000016, 'distance_accuracy_value','confusion accuracy'); 0000020 = PRODUCT_TYPE('part',$,(0000007)); ENDSEC; END-ISO-10303-21;
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FreeCAD Information

unauthenticated 2011-05-28 04:32 viewer ~0000865	Correction : not a triangle mesh, but a quad mesh

yorik 2011-05-28 21:18 administrator ~0000866	That is because, I think, meshes are not taken into account by the Part module (responsible for exporting to brep, step and iges). I'm not sure how practical/easy it would be to export meshes to step format...

unauthenticated 2011-05-30 00:02 viewer ~0000872	yeah..need to check the STEP documentation. So far, can't find any tools that can convert mesh to STEP..I wonder if it's impossible..

yorik 2011-05-30 11:35 administrator ~0000873	One solution is to convert your meshes to Part shapes (via the Part->Make Part from Mesh command). Then they will be exported to STEP. But Converting meshes to parts can be a rather heavy operation that will only be interesting if your meshes are quite simple, otherwise the part objects will be almost unmanageable.

wmayer 2011-05-30 11:48 administrator ~0000874	To make a BREP of a mesh object follow the way Yorik suggested. Afterwards you can export this object to STEP. I guess what you did is loading the quad mesh, selected it and tried to export this to STEP. However, the export function inside only checks for special objects and ignores all the others. I think it's better to print at least a message when an object is ignored.

wmayer 2011-05-30 12:02 administrator ~0000875	Fixed in r4532. A message is printed when ignoring objects from being exported to STEP, IGES or BREP.

Date Modified	Username	Field	Change
2011-05-28 01:20	unauthenticated	New Issue
2011-05-28 04:32	unauthenticated	Note Added: 0000865
2011-05-28 21:18	yorik	Note Added: 0000866
2011-05-30 00:02	unauthenticated	Note Added: 0000872
2011-05-30 11:35	yorik	Note Added: 0000873
2011-05-30 11:48	wmayer	Note Added: 0000874
2011-05-30 12:02	wmayer	Note Added: 0000875
2011-05-30 12:02	wmayer	Status	new => closed
2011-05-30 12:02	wmayer	Resolution	open => fixed
2011-05-30 12:02	wmayer	Fixed in Version	=> 0.12