Hi Joey
Instead of messing about with the selection, just get all the edges into
a collection and then filter the collection.
Here's an example, but with polygons and the Quad filter:
var oCone = ActiveSceneRoot.AddGeometry("Cone","MeshSurface");
var oPolygons = oCone.ActivePrimitive.Geometry.Polygons;
var oColl = XSIFactory.CreateActiveXObject("XSI.Collection");
oColl.AddItems(oPolygons);
LogMessage( oColl.Count );
var oFilter = Application.Filters("Quad");
var oQuads = oFilter.Subset( oColl );
LogMessage( oQuads.Count );
Also
Application.Selection is a Selection object
Selection(0).ActivePrimitive.Geometry.Segments is a SegmentCollection
that's why you get the error
-----Original Message-----
From: owner-xsi(at)Softimage.COM [mailto:owner-xsi(at)Softimage.COM] On Behalf
Of Joey Ponthieux
Sent: April 13, 2006 2:58 PM
To: xsi(at)Softimage.COM
Subject: OM scripting
Hello,
Last week I started learning XSI scripting. I've been attempting to
expand my undersatnding of the OM and I've run into some issues that I
can't seem to resolve. I want to select all the border edges in an
object, but I want to do it with the object model. I know I can do it
with a command using:
SelectAllUsingFilter("Border_Edge", siCheckComponentVisibility, null,
null);
on a selected object, however the point of this is to try and get a
broader understanding of the object model. What I have at the moment is
a cube subdivided
4x4 with some holes in it, the first example of code I have is an object
to component conversion:
//Select the object
SelectObj("cube", null, true);
//get a collection of all the edges on the selected object var oSelList
= Selection(0).ActivePrimitive.Geometry.Segments;
//select all edges in collection
SelectGeometryComponents(oSelList);
//set filter to border edges
var oFilter = Application.Filters("Border_Edge");
//create a new collection of only the border edges from the currently
selected edges var oBEdges = oFilter.Subset( Application.Selection );
//select all of the filtered border edges in the collection
SelectGeometryComponents(oBEdges);
//This results in a selection of all border edges on the object
I would like to execute this by only using SelectGeometryComponents once
at the end. As it stands I have to use the following to convert from an
object selection to an edge collection to an edge selection to border
edge collection:
var oSelList = Selection(0).ActivePrimitive.Geometry.Segments;
SelectGeometryComponents(oSelList);
var oFilter = Application.Filters("Border_Edge");
var oBEdges = oFilter.Subset( Application.Selection );
how can I shorten this to do it strictly in OM avoiding the use of
SelectGeometryComponents? For example the following fails giving me an
invalid argument error:
var oSelList = Selection(0).ActivePrimitive.Geometry.Segments;
var oFilter = Application.Filters("Border_Edge");
var oBEdges = oFilter.Subset( oSelList);
Why does Application.Selection work but not oSelList, don't they return
the same thing?
I want to get the OBedges collection without ever accessing a selection,
is that possible?
--------------------------
the second example of code I have is a component(edge) to
component(border edge) conversion, two of the previously required steps
which convert the object selection to an edge collection can be removed
from this code since edges are already selected:
//Select some edges on the cube
SelectGeometryComponents("cube.edge[26,27,30,39-44,52-57,65-69,89,90,93,
94,97-103,122,130-135,164,166]");
//set filter to border edges
var oFilter = Application.Filters("Border_Edge");
//create a new collection of only the border edges from the currently
selected edges var oBEdges = oFilter.Subset( Application.Selection );
//select all of the filtered border edges in the collection
SelectGeometryComponents(oBEdges);
//This results in a selection only the border edges defined in the
partial edge selection
this works fine however I want to modify it so I can filter border edges
from a collection of polys instead of the object or edges. I tried:
SelectGeometryComponents("cube.poly[10-12,16-19,22-25,28-30,38,40,42,43,
45-47,61,63,79]");
var oFilter = Application.Filters("Border_Edge");
var oBEdges = oFilter.Subset( Application.Selection );
But this doesnt work. Not that I am suprised much but I can't seem to
determine if there is an OM method to convert a collection of polys into
a collection of edges like there was for objects as in
Selection(0).ActivePrimitive.Geometry.Segments. I tried using
ComponentCollection but that didn t work either. I know I can do this
with SelectAdjacent command but again I'm trying to do this with the OM.
I'm sure this has to be easier than I am making it.
--
Joey Ponthieux
NCI Information Systems Inc.
NASA Langley Research Center
____________________________________________________________
Opinions stated here-in are strictly those of the author and do not
represent the opinions of NASA or any other party.
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