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:* [email protected] *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; [email protected] <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 <[email protected] <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