0022680: Empty result after STEP import

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Summary	0022680: Empty result after STEP import

Revision	2011-09-21 14:29 by szy
Description	This problem is reported in the Forum thread http://www.opencascade.org/org/forum/thread_21219/. [^] The reason of the reported problem is duplicated knots in BSpline curve definition: normally duplicated knots should be written as one value, but with associated multiplicity > 1; here they are written as plain knots, all with multiplicity 1, but duplicated. This causes exception on attemt to create bspline curve in OCCT, and result is empty. It might be reasonable for us to make a fix against such case in OCCT (should be pretty easy). Note that the file has interesting header: ISO-10303-21; HEADER; FILE_DESCRIPTION(('3-D model version:1'),'2;1'); FILE_NAME('C5-390.410-63090C', '2001-01-01T00:00:00+00:00',('Tdm3DGenerator'),('AB Sandvik Coromant'),'', 'ESSENCE Processor',''); FILE_SCHEMA(('CONFIG_CONTROL_DESIGN')); ENDSEC; It seems that it is written by custom STEP processor created by Sandvik Goromant company (swedish producer of cutting tools).

Revision	2011-07-22 11:14 by szy
Description	This problem is reported in the Forum thread http://www.opencascade.org/org/forum/thread_21219/. [^] The reason of the reported problem is duplicated knots in BSpline curve definition: normally duplicated knots should be written as one value, but with associated multiplicity > 1; here they are written as plain knots, all with multiplicity 1, but duplicated. This causes exception on attemt to create bspline curve in OCCT, and result is empty. It might be reasonable for us to make a fix against such case in OCCT (should be pretty easy). Note that the file has interesting header: ISO-10303-21; HEADER; FILE_DESCRIPTION(('3-D model version:1'),'2;1'); FILE_NAME('C5-390.410-63090C', '2001-01-01T00:00:00+00:00',('Tdm3DGenerator'),('AB Sandvik Coromant'),'', 'ESSENCE Processor',''); FILE_SCHEMA(('CONFIG_CONTROL_DESIGN')); ENDSEC; It seems that it is written by custom STEP processor created by Sandvik Goromant company (swedish producer of cutting tools).