July 2015 - cgma-dev - mailman3.cels.anl.gov

Re: [cgma-dev] Why can't I create surfaces from curves
by Patrick Shriwise 28 Jul '15

28 Jul '15

Just taking a second to recant that last sentence. I was still using Cubit 13.1 today. The enumerator seems to be alright when using Cubit 14. Cheers, Patrick On 07/28/2015 02:55 PM, Patrick Shriwise wrote: > Evan, > > Spot on. We got it working after adjusting the cubit flag to > TORUS_SURFACE_TYPE. > > Seems like this is a problem from 13.1 on as I had the same issue in > Cubit 14.... > > > Cheers, > > Patrick > > On 07/28/15 11:21, Vander Zee, Evan B. wrote: >> >> Andy, >> >> I reproduced your problem using a version of CGM that I built on >> Cubit13.1. After some experimentation, I think that the problem is >> that the GeometryType is off by one in CGMA from what the Cubit >> library expects. I got successful RefFaces when passing arguments >> CONE_SURFACE_TYPE (which I am guessing is interpreted as the >> one-later enum value PLANE_SURFACE_TYPE) and TORUS_SURFACE_TYPE >> (which I am guessing is interpreted as the one-later enum value >> BEST_FIT_SURFACE_TYPE). >> >> We ought to fix the off-by-one error, but for now just the >> information I’ve given will probably help you with whatever you are >> doing. >> >> I’m not sure which value would have to be removed/renumbered to get >> CGMA to agree with Cubit. Is anyone else familiar with the >> GeometryType enumeration? I’m just making my best guess here . . . >> >> -Evan >> >> *From:*Vander Zee, Evan B. >> *Sent:* Monday, July 27, 2015 4:48 PM >> *To:* cgma-dev(a)mcs.anl.gov >> *Cc:* Patrick Shriwise; 'Andrew Davis' >> *Subject:* RE: [cgma-dev] Why can't I create surfaces from curves >> >> It is a little hard to tell exactly what you are trying to do, but it >> looks like you are trying to create a circular patch in the y-z >> plane. I tried running the code you provided with OCC geometry >> engine, and I got no errors. >> >> Some things you could try would be giving more than two edges and >> linking edges better in a loop, i.e., making sure that the end vertex >> of one edge is the beginning vertex of the next. I planned to try >> these, but my only successful build of CGM with acis so far is a >> cmake build, and I’m still a novice in the cmake build system, so I >> didn’t get far enough to reproduce the problem. What version are you >> using? >> >> -Evan >> >> *From:*[email protected] >> <mailto:[email protected]> >> [mailto:[email protected]] *On Behalf Of *Andrew Davis >> *Sent:* Monday, July 27, 2015 10:01 AM >> *To:* Patrick Shriwise >> *Cc:* Andrew Davis; cgma-dev(a)mcs.anl.gov <mailto:[email protected]> >> *Subject:* Re: [cgma-dev] Why can't I create surfaces from curves >> >> Hi Patrick >> >> Irrespective of whether or not I use planar, best fit, sphere, its >> the same error message over and over again. >> >> Thanks >> >> Andy >> >> On Sat, Jul 25, 2015 at 8:00 AM, Patrick Shriwise <shriwise(a)wisc.edu >> <mailto:[email protected]>> wrote: >> >> Hey Andy, >> >> The error message seems to indicate it's trying to make a surface >> which isn't planar.. maybe thats a good starting point? Are there >> other flags to hand that function by chance? >> >> Cheers, >> >> Patrick >> >> On 07/23/2015 02:34 PM, Andrew Davis wrote: >> >> Hi Guys >> >> I have the following function that I've added to my version of iGeom, >> >> ITAPS_API void >> >> iGeom_createSurface2(iGeom_Instance instance, >> >> /*in*/ iBase_EntityHandle *input_curves, >> >> /*in*/ int num_curves, >> >> /*out*/ iBase_EntityHandle *geom_entity, >> >> int* err) >> >> { >> >> CubitVector p1(0, 0, 5); >> >> RefVertex* v1 = gmt->make_RefVertex(p1); >> >> CubitVector p2(0, 0, -5); >> >> RefVertex* v2 = gmt->make_RefVertex(p2); >> >> CubitVector p3(0, 5, 0); >> >> RefVertex* v3 = gmt->make_RefVertex(p3); >> >> CubitVector p4(0, -5, 0); >> >> RefVertex* v4 = gmt->make_RefVertex(p4); >> >> RefEdge* e1 = gmt->make_RefEdge(ARC_CURVE_TYPE,v1,v2,&p3); >> >> RefEdge* e2 = gmt->make_RefEdge(ARC_CURVE_TYPE,v1,v2,&p4); >> >> DLIList<RefEdge*> curves; >> >> curves.insert(e1); >> >> curves.insert(e2); >> >> RefFace* tmp_surface = gmt->make_RefFace(PLANE_SURFACE_TYPE, >> >> curves, >> >> false); >> >> *geom_entity = reinterpret_cast<iBase_EntityHandle>(tmp_surface); >> >> RETURN ((tmp_surface ? iBase_SUCCESS : iBase_FAILURE)); >> >> } >> >> When I run this, I can sucessfully create the vertices, and >> create curves from those verts using make_RefEdge. When I try to >> create a surface from those two ref edges I get the following error. >> >> WARNING: In AcisGeometryEngine::make_FACE >> >> At this time, cannot make a FACE that isn't planar or >> best fit. >> >> ERROR: In AcisModifyEngine::make_Surface >> >> Cannot make Surface object. >> >> ERROR: Couldn't make new RefFace. >> >> If I save the file as acis and examine the results in Cubit, they >> appear as they should (minus the surface). I can, in Cubit, make >> surface then, sweep and do all the operations that I want to. >> >> Is there something that I', just misunderstanding about CGM / gmt >> that means I'm using this wrong? >> >> Thanks >> >> Andy >> >

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Re: [cgma-dev] Why can't I create surfaces from curves
by Patrick Shriwise 28 Jul '15

28 Jul '15

Evan, Spot on. We got it working after adjusting the cubit flag to TORUS_SURFACE_TYPE. Seems like this is a problem from 13.1 on as I had the same issue in Cubit 14.... Cheers, Patrick On 07/28/15 11:21, Vander Zee, Evan B. wrote: > > Andy, > > I reproduced your problem using a version of CGM that I built on > Cubit13.1. After some experimentation, I think that the problem is > that the GeometryType is off by one in CGMA from what the Cubit > library expects. I got successful RefFaces when passing arguments > CONE_SURFACE_TYPE (which I am guessing is interpreted as the one-later > enum value PLANE_SURFACE_TYPE) and TORUS_SURFACE_TYPE (which I am > guessing is interpreted as the one-later enum value > BEST_FIT_SURFACE_TYPE). > > We ought to fix the off-by-one error, but for now just the information > I’ve given will probably help you with whatever you are doing. > > I’m not sure which value would have to be removed/renumbered to get > CGMA to agree with Cubit. Is anyone else familiar with the > GeometryType enumeration? I’m just making my best guess here . . . > > -Evan > > *From:*Vander Zee, Evan B. > *Sent:* Monday, July 27, 2015 4:48 PM > *To:* cgma-dev(a)mcs.anl.gov > *Cc:* Patrick Shriwise; 'Andrew Davis' > *Subject:* RE: [cgma-dev] Why can't I create surfaces from curves > > It is a little hard to tell exactly what you are trying to do, but it > looks like you are trying to create a circular patch in the y-z > plane. I tried running the code you provided with OCC geometry > engine, and I got no errors. > > Some things you could try would be giving more than two edges and > linking edges better in a loop, i.e., making sure that the end vertex > of one edge is the beginning vertex of the next. I planned to try > these, but my only successful build of CGM with acis so far is a cmake > build, and I’m still a novice in the cmake build system, so I didn’t > get far enough to reproduce the problem. What version are you using? > > -Evan > > *From:*[email protected] > <mailto:[email protected]> > [mailto:[email protected]] *On Behalf Of *Andrew Davis > *Sent:* Monday, July 27, 2015 10:01 AM > *To:* Patrick Shriwise > *Cc:* Andrew Davis; cgma-dev(a)mcs.anl.gov <mailto:[email protected]> > *Subject:* Re: [cgma-dev] Why can't I create surfaces from curves > > Hi Patrick > > Irrespective of whether or not I use planar, best fit, sphere, its the > same error message over and over again. > > Thanks > > Andy > > On Sat, Jul 25, 2015 at 8:00 AM, Patrick Shriwise <shriwise(a)wisc.edu > <mailto:[email protected]>> wrote: > > Hey Andy, > > The error message seems to indicate it's trying to make a surface > which isn't planar.. maybe thats a good starting point? Are there > other flags to hand that function by chance? > > Cheers, > > Patrick > > On 07/23/2015 02:34 PM, Andrew Davis wrote: > > Hi Guys > > I have the following function that I've added to my version of iGeom, > > ITAPS_API void > > iGeom_createSurface2(iGeom_Instance instance, > > /*in*/ iBase_EntityHandle *input_curves, > > /*in*/ int num_curves, > > /*out*/ iBase_EntityHandle *geom_entity, > > int* err) > > { > > CubitVector p1(0, 0, 5); > > RefVertex* v1 = gmt->make_RefVertex(p1); > > CubitVector p2(0, 0, -5); > > RefVertex* v2 = gmt->make_RefVertex(p2); > > CubitVector p3(0, 5, 0); > > RefVertex* v3 = gmt->make_RefVertex(p3); > > CubitVector p4(0, -5, 0); > > RefVertex* v4 = gmt->make_RefVertex(p4); > > RefEdge* e1 = gmt->make_RefEdge(ARC_CURVE_TYPE,v1,v2,&p3); > > RefEdge* e2 = gmt->make_RefEdge(ARC_CURVE_TYPE,v1,v2,&p4); > > DLIList<RefEdge*> curves; > > curves.insert(e1); > > curves.insert(e2); > > RefFace* tmp_surface = gmt->make_RefFace(PLANE_SURFACE_TYPE, > > curves, > > false); > > *geom_entity = reinterpret_cast<iBase_EntityHandle>(tmp_surface); > > RETURN ((tmp_surface ? iBase_SUCCESS : iBase_FAILURE)); > > } > > When I run this, I can sucessfully create the vertices, and create > curves from those verts using make_RefEdge. When I try to create a > surface from those two ref edges I get the following error. > > WARNING: In AcisGeometryEngine::make_FACE > > At this time, cannot make a FACE that isn't planar or > best fit. > > ERROR: In AcisModifyEngine::make_Surface > > Cannot make Surface object. > > ERROR: Couldn't make new RefFace. > > If I save the file as acis and examine the results in Cubit, they > appear as they should (minus the surface). I can, in Cubit, make > surface then, sweep and do all the operations that I want to. > > Is there something that I', just misunderstanding about CGM / gmt > that means I'm using this wrong? > > Thanks > > Andy >

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Re: [cgma-dev] Why can't I create surfaces from curves
by Vander Zee, Evan B. 28 Jul '15

28 Jul '15

Andy, I reproduced your problem using a version of CGM that I built on Cubit13.1. After some experimentation, I think that the problem is that the GeometryType is off by one in CGMA from what the Cubit library expects. I got successful RefFaces when passing arguments CONE_SURFACE_TYPE (which I am guessing is interpreted as the one-later enum value PLANE_SURFACE_TYPE) and TORUS_SURFACE_TYPE (which I am guessing is interpreted as the one-later enum value BEST_FIT_SURFACE_TYPE). We ought to fix the off-by-one error, but for now just the information I’ve given will probably help you with whatever you are doing. I’m not sure which value would have to be removed/renumbered to get CGMA to agree with Cubit. Is anyone else familiar with the GeometryType enumeration? I’m just making my best guess here . . . -Evan From: Vander Zee, Evan B. Sent: Monday, July 27, 2015 4:48 PM To: cgma-dev(a)mcs.anl.gov Cc: Patrick Shriwise; 'Andrew Davis' Subject: RE: [cgma-dev] Why can't I create surfaces from curves It is a little hard to tell exactly what you are trying to do, but it looks like you are trying to create a circular patch in the y-z plane. I tried running the code you provided with OCC geometry engine, and I got no errors. Some things you could try would be giving more than two edges and linking edges better in a loop, i.e., making sure that the end vertex of one edge is the beginning vertex of the next. I planned to try these, but my only successful build of CGM with acis so far is a cmake build, and I’m still a novice in the cmake build system, so I didn’t get far enough to reproduce the problem. What version are you using? -Evan From: cgma-dev-bounces(a)mcs.anl.gov<mailto:[email protected]> [mailto:[email protected]] On Behalf Of Andrew Davis Sent: Monday, July 27, 2015 10:01 AM To: Patrick Shriwise Cc: Andrew Davis; cgma-dev(a)mcs.anl.gov<mailto:[email protected]> Subject: Re: [cgma-dev] Why can't I create surfaces from curves Hi Patrick Irrespective of whether or not I use planar, best fit, sphere, its the same error message over and over again. Thanks Andy On Sat, Jul 25, 2015 at 8:00 AM, Patrick Shriwise <shriwise(a)wisc.edu<mailto:[email protected]>> wrote: Hey Andy, The error message seems to indicate it's trying to make a surface which isn't planar.. maybe thats a good starting point? Are there other flags to hand that function by chance? Cheers, Patrick On 07/23/2015 02:34 PM, Andrew Davis wrote: Hi Guys I have the following function that I've added to my version of iGeom, ITAPS_API void iGeom_createSurface2(iGeom_Instance instance, /*in*/ iBase_EntityHandle *input_curves, /*in*/ int num_curves, /*out*/ iBase_EntityHandle *geom_entity, int* err) { CubitVector p1(0, 0, 5); RefVertex* v1 = gmt->make_RefVertex(p1); CubitVector p2(0, 0, -5); RefVertex* v2 = gmt->make_RefVertex(p2); CubitVector p3(0, 5, 0); RefVertex* v3 = gmt->make_RefVertex(p3); CubitVector p4(0, -5, 0); RefVertex* v4 = gmt->make_RefVertex(p4); RefEdge* e1 = gmt->make_RefEdge(ARC_CURVE_TYPE,v1,v2,&p3); RefEdge* e2 = gmt->make_RefEdge(ARC_CURVE_TYPE,v1,v2,&p4); DLIList<RefEdge*> curves; curves.insert(e1); curves.insert(e2); RefFace* tmp_surface = gmt->make_RefFace(PLANE_SURFACE_TYPE, curves, false); *geom_entity = reinterpret_cast<iBase_EntityHandle>(tmp_surface); RETURN ((tmp_surface ? iBase_SUCCESS : iBase_FAILURE)); } When I run this, I can sucessfully create the vertices, and create curves from those verts using make_RefEdge. When I try to create a surface from those two ref edges I get the following error. WARNING: In AcisGeometryEngine::make_FACE At this time, cannot make a FACE that isn't planar or best fit. ERROR: In AcisModifyEngine::make_Surface Cannot make Surface object. ERROR: Couldn't make new RefFace. If I save the file as acis and examine the results in Cubit, they appear as they should (minus the surface). I can, in Cubit, make surface then, sweep and do all the operations that I want to. Is there something that I', just misunderstanding about CGM / gmt that means I'm using this wrong? Thanks Andy

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Re: [cgma-dev] Why can't I create surfaces from curves
by Vander Zee, Evan B. 27 Jul '15

27 Jul '15

It is a little hard to tell exactly what you are trying to do, but it looks like you are trying to create a circular patch in the y-z plane. I tried running the code you provided with OCC geometry engine, and I got no errors. Some things you could try would be giving more than two edges and linking edges better in a loop, i.e., making sure that the end vertex of one edge is the beginning vertex of the next. I planned to try these, but my only successful build of CGM with acis so far is a cmake build, and I’m still a novice in the cmake build system, so I didn’t get far enough to reproduce the problem. What version are you using? -Evan From: cgma-dev-bounces(a)mcs.anl.gov [mailto:[email protected]] On Behalf Of Andrew Davis Sent: Monday, July 27, 2015 10:01 AM To: Patrick Shriwise Cc: Andrew Davis; cgma-dev(a)mcs.anl.gov Subject: Re: [cgma-dev] Why can't I create surfaces from curves Hi Patrick Irrespective of whether or not I use planar, best fit, sphere, its the same error message over and over again. Thanks Andy On Sat, Jul 25, 2015 at 8:00 AM, Patrick Shriwise <shriwise(a)wisc.edu<mailto:[email protected]>> wrote: Hey Andy, The error message seems to indicate it's trying to make a surface which isn't planar.. maybe thats a good starting point? Are there other flags to hand that function by chance? Cheers, Patrick On 07/23/2015 02:34 PM, Andrew Davis wrote: Hi Guys I have the following function that I've added to my version of iGeom, ITAPS_API void iGeom_createSurface2(iGeom_Instance instance, /*in*/ iBase_EntityHandle *input_curves, /*in*/ int num_curves, /*out*/ iBase_EntityHandle *geom_entity, int* err) { CubitVector p1(0, 0, 5); RefVertex* v1 = gmt->make_RefVertex(p1); CubitVector p2(0, 0, -5); RefVertex* v2 = gmt->make_RefVertex(p2); CubitVector p3(0, 5, 0); RefVertex* v3 = gmt->make_RefVertex(p3); CubitVector p4(0, -5, 0); RefVertex* v4 = gmt->make_RefVertex(p4); RefEdge* e1 = gmt->make_RefEdge(ARC_CURVE_TYPE,v1,v2,&p3); RefEdge* e2 = gmt->make_RefEdge(ARC_CURVE_TYPE,v1,v2,&p4); DLIList<RefEdge*> curves; curves.insert(e1); curves.insert(e2); RefFace* tmp_surface = gmt->make_RefFace(PLANE_SURFACE_TYPE, curves, false); *geom_entity = reinterpret_cast<iBase_EntityHandle>(tmp_surface); RETURN ((tmp_surface ? iBase_SUCCESS : iBase_FAILURE)); } When I run this, I can sucessfully create the vertices, and create curves from those verts using make_RefEdge. When I try to create a surface from those two ref edges I get the following error. WARNING: In AcisGeometryEngine::make_FACE At this time, cannot make a FACE that isn't planar or best fit. ERROR: In AcisModifyEngine::make_Surface Cannot make Surface object. ERROR: Couldn't make new RefFace. If I save the file as acis and examine the results in Cubit, they appear as they should (minus the surface). I can, in Cubit, make surface then, sweep and do all the operations that I want to. Is there something that I', just misunderstanding about CGM / gmt that means I'm using this wrong? Thanks Andy

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Re: [cgma-dev] Why can't I create surfaces from curves
by Andrew Davis 27 Jul '15

27 Jul '15

Hi Patrick Irrespective of whether or not I use planar, best fit, sphere, its the same error message over and over again. Thanks Andy On Sat, Jul 25, 2015 at 8:00 AM, Patrick Shriwise <shriwise(a)wisc.edu> wrote: > Hey Andy, > > The error message seems to indicate it's trying to make a surface which > isn't planar.. maybe thats a good starting point? Are there other flags to > hand that function by chance? > > Cheers, > > Patrick > > On 07/23/2015 02:34 PM, Andrew Davis wrote: > > Hi Guys > > I have the following function that I've added to my version of iGeom, > > ITAPS_API void > iGeom_createSurface2(iGeom_Instance instance, > /*in*/ iBase_EntityHandle *input_curves, > /*in*/ int num_curves, > /*out*/ iBase_EntityHandle *geom_entity, > int* err) > { > CubitVector p1(0, 0, 5); > RefVertex* v1 = gmt->make_RefVertex(p1); > > CubitVector p2(0, 0, -5); > RefVertex* v2 = gmt->make_RefVertex(p2); > > CubitVector p3(0, 5, 0); > RefVertex* v3 = gmt->make_RefVertex(p3); > > CubitVector p4(0, -5, 0); > RefVertex* v4 = gmt->make_RefVertex(p4); > > RefEdge* e1 = gmt->make_RefEdge(ARC_CURVE_TYPE,v1,v2,&p3); > RefEdge* e2 = gmt->make_RefEdge(ARC_CURVE_TYPE,v1,v2,&p4); > > DLIList<RefEdge*> curves; > curves.insert(e1); > curves.insert(e2); > > RefFace* tmp_surface = gmt->make_RefFace(PLANE_SURFACE_TYPE, > curves, > false); > > *geom_entity = reinterpret_cast<iBase_EntityHandle>(tmp_surface); > RETURN ((tmp_surface ? iBase_SUCCESS : iBase_FAILURE)); > } > > When I run this, I can sucessfully create the vertices, and create > curves from those verts using make_RefEdge. When I try to create a surface > from those two ref edges I get the following error. > > WARNING: In AcisGeometryEngine::make_FACE > At this time, cannot make a FACE that isn't planar or best fit. > ERROR: In AcisModifyEngine::make_Surface > Cannot make Surface object. > ERROR: Couldn't make new RefFace. > > If I save the file as acis and examine the results in Cubit, they appear > as they should (minus the surface). I can, in Cubit, make surface then, > sweep and do all the operations that I want to. > > Is there something that I', just misunderstanding about CGM / gmt that > means I'm using this wrong? > > Thanks > > Andy > > > > >

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Re: [cgma-dev] Why can't I create surfaces from curves
by Patrick Shriwise 25 Jul '15

25 Jul '15

Hey Andy, The error message seems to indicate it's trying to make a surface which isn't planar.. maybe thats a good starting point? Are there other flags to hand that function by chance? Cheers, Patrick On 07/23/2015 02:34 PM, Andrew Davis wrote: > Hi Guys > > I have the following function that I've added to my version of iGeom, > > ITAPS_API void > iGeom_createSurface2(iGeom_Instance instance, > /*in*/ iBase_EntityHandle *input_curves, > /*in*/ int num_curves, > /*out*/ iBase_EntityHandle *geom_entity, > int* err) > { > CubitVector p1(0, 0, 5); > RefVertex* v1 = gmt->make_RefVertex(p1); > > CubitVector p2(0, 0, -5); > RefVertex* v2 = gmt->make_RefVertex(p2); > > CubitVector p3(0, 5, 0); > RefVertex* v3 = gmt->make_RefVertex(p3); > > CubitVector p4(0, -5, 0); > RefVertex* v4 = gmt->make_RefVertex(p4); > > RefEdge* e1 = gmt->make_RefEdge(ARC_CURVE_TYPE,v1,v2,&p3); > RefEdge* e2 = gmt->make_RefEdge(ARC_CURVE_TYPE,v1,v2,&p4); > > DLIList<RefEdge*> curves; > curves.insert(e1); > curves.insert(e2); > > RefFace* tmp_surface = gmt->make_RefFace(PLANE_SURFACE_TYPE, > curves, > false); > *geom_entity = reinterpret_cast<iBase_EntityHandle>(tmp_surface); > RETURN ((tmp_surface ? iBase_SUCCESS : iBase_FAILURE)); > } > > When I run this, I can sucessfully create the vertices, and create > curves from those verts using make_RefEdge. When I try to create a > surface from those two ref edges I get the following error. > > WARNING: In AcisGeometryEngine::make_FACE > At this time, cannot make a FACE that isn't planar or best fit. > ERROR: In AcisModifyEngine::make_Surface > Cannot make Surface object. > ERROR: Couldn't make new RefFace. > > If I save the file as acis and examine the results in Cubit, they > appear as they should (minus the surface). I can, in Cubit, make > surface then, sweep and do all the operations that I want to. > > Is there something that I', just misunderstanding about CGM / gmt that > means I'm using this wrong? > > Thanks > > Andy > > >

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Why can't I create surfaces from curves
by Andrew Davis 23 Jul '15

23 Jul '15

Hi Guys I have the following function that I've added to my version of iGeom, ITAPS_API void iGeom_createSurface2(iGeom_Instance instance, /*in*/ iBase_EntityHandle *input_curves, /*in*/ int num_curves, /*out*/ iBase_EntityHandle *geom_entity, int* err) { CubitVector p1(0, 0, 5); RefVertex* v1 = gmt->make_RefVertex(p1); CubitVector p2(0, 0, -5); RefVertex* v2 = gmt->make_RefVertex(p2); CubitVector p3(0, 5, 0); RefVertex* v3 = gmt->make_RefVertex(p3); CubitVector p4(0, -5, 0); RefVertex* v4 = gmt->make_RefVertex(p4); RefEdge* e1 = gmt->make_RefEdge(ARC_CURVE_TYPE,v1,v2,&p3); RefEdge* e2 = gmt->make_RefEdge(ARC_CURVE_TYPE,v1,v2,&p4); DLIList<RefEdge*> curves; curves.insert(e1); curves.insert(e2); RefFace* tmp_surface = gmt->make_RefFace(PLANE_SURFACE_TYPE, curves, false); *geom_entity = reinterpret_cast<iBase_EntityHandle>(tmp_surface); RETURN ((tmp_surface ? iBase_SUCCESS : iBase_FAILURE)); } When I run this, I can sucessfully create the vertices, and create curves from those verts using make_RefEdge. When I try to create a surface from those two ref edges I get the following error. WARNING: In AcisGeometryEngine::make_FACE At this time, cannot make a FACE that isn't planar or best fit. ERROR: In AcisModifyEngine::make_Surface Cannot make Surface object. ERROR: Couldn't make new RefFace. If I save the file as acis and examine the results in Cubit, they appear as they should (minus the surface). I can, in Cubit, make surface then, sweep and do all the operations that I want to. Is there something that I', just misunderstanding about CGM / gmt that means I'm using this wrong? Thanks Andy

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