[cgma-dev] Why can't I create surfaces from curves

[Patrick Shriwise]

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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