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

[Andrew Davis]

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 at 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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