[Smtk-developers] New CGM operators

[Yumin Yuan]

That's great, Dave.

I updated a few things from cmb_v4, and here is what I got:

* Creating Prism, Brick, Cylinder are working, see attached screenshot.
* Creating sphere return a sphere, sort of (see attached )
* Creating Vertex, Edge, Face did not work for me. No geometry returned,
and sometime crash. I believe the crashes were from cgm, and I don't have
useful backtrace info from the crash.

Yumin

On Thu, Nov 13, 2014 at 2:49 PM, David Thompson <david.thompson at kitware.com>
wrote:

> Hi all,
>
> I've added a batch of new CGM operators to SMTK (and fixed a few things in
> the process). The operators include:
>
> - create vertex
> - create edge (straight, arc, ellipse, parabola, hyperbola... but only
> straight and arc are tested)
> - create face (planar or "best fit" -- which is a synonym for planar as
> far as I can tell)
> - create cylinder
> - create brick
> - create sphere
> - create prism
> - union (a boolean, but only tested in a simple case)
> - read (from a file supported by CGM)
>
> There are examples of the operators in the smtk/bridge/cgm/testing/python
> directory.
>
> Some notes:
>
> 1. The "create brick" operator is interesting because it demonstrates
> conditional items.
> 2. the "union" operator is interesting because it expects the models you
> wish to unite to be associated with it rather than passed in via an
> smtk::attribute::ModelEntityItem.
> 3. The edge and face creation operators currently take vertices and edges
> to connect as input items, but will probably move to using an association
> in the future.
> 4. Yumin has discovered that the union operator exposes an issue in the
> model manager... the result of the operation does not appear to be properly
> transcribed when using a forwarding bridge.
> 5. Some of the operator XML descriptions are marked as requiring a "b"
> association. This is a new type of association and indicates that the
> operator should be associated to a bridge session. Creation operators in
> general should have this type of association so that the user can choose
> which session/kernel to use.
>
> David
>
> PS. As an example, the Python script below created the 4 vertices, 6
> edges, and 3 faces in the screenshot.
>
> import smtk
> mgr = smtk.model.Manager.create()
> sess = mgr.createSession('cgm')
> brg = sess.bridge()
>
> def setCoord(x,v):
>   for i in range(len(v)):
>     x.setValue(i,v[i])
>
> def setEntitiesByIndex(p,ep,v):
>   for i in range(len(ep)):
>     p.setValue(i, v[ep[i]])
>
> verts = []
> edges = []
> faces = []
> volus = []
>
> # Create vertices
> pcoords = [ (0,0,0), (1,0,0), (0,1,0), (0,0,1)]
> crv = sess.op('create vertex')
> x = crv.findAsDouble('point')
> c = crv.findAsInt('color')
> c.setValue(0, 1)
> for pt in pcoords:
>   setCoord(x,pt);
>   verts.append(crv.operate().findModelEntity('vertex').value(0))
>
> # Create edges
> epts = [(0,1), (0,2), (0,3), (1,2), (1,3), (2,3)]
> cre = sess.op('create edge')
> t = cre.findAsInt('curve type')
> t.setValue(0,6) # 6 == line segment in OpenCascade
> v = cre.findAsModelEntity('vertices')
> x = cre.findAsDouble('point')
> c = cre.findAsInt('color')
> c.setValue(0, 2)
> for epair in epts:
>   setEntitiesByIndex(v,epair,verts)
>   if epair == (2,3):
>     # Make the last edge an arc:
>     t.setValue(0,1) # 1 == arc
>     setCoord(x,[0,0.6,0.6]) # third point on arc
>   edges.append(cre.operate().findModelEntity('edge').value(0))
>
> # Create faces
> fedg = [
>     (12, 0, 3, 1),
>     (12, 0, 4, 2),
>     (16, 1, 5, 2)
>     ]
> #   (16, 3, 5, 4) # <-- OpenCascade cannot infer that this face should be
> cylindrical
> crf = sess.op('create face')
> t = crf.findAsInt('surface type')
> t.setValue(0, 12)
> e = crf.findAsModelEntity('edges')
> c = crf.findAsInt('color')
> c.setValue(0, 3)
> for face in fedg:
>   e.setNumberOfValues(len(face)-1)
>   setEntitiesByIndex(e,face[1:],edges)
>   t.setValue(face[0]) # These values are OpenCascade enum values.
>   faces.append(crf.operate().findModelEntity('face').value(0))
>
>
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>
>
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