thanks guys. In the end I went for loops, and even created a handy function
that builds a dictionary with component ID -> cluster mappings. It is not
super fast, and it only supports 1 to 1 relationships, but served well for
its purpose. I just need one call, so I stored everything into an ice
operator that ultimately gets freezed.
here's the code snippet if anybody needs it:
function buildComponentClusterDictionary(inMesh, clsType){
//clsTypes: pnt | poly | edge ...
var clusters = inMesh.ActivePrimitive.Geometry.clusters
dClusters = new ActiveXObject("Scripting.Dictionary");
for (i=0;i<clusters.count;i++){
var cluster = clusters(i);
if (cluster.type == clsType){
var clsElements = cluster.Elements;
var aItems = clsElements.Array.toArray();
for (j=0;j<aItems.length;j++){
dClusters.add(aItems[j], cluster);
}
}
}
return dClusters;
}
//------------//
//example//
//------------//
//setup scene with sphere and a point cluster...
var sphere = CreatePrim("Sphere", "MeshSurface", null, null);;
SelectGeometryComponents(sphere+".pnt[1,5-8,12-15,19-22,26-29,33-36,40-43,47-50,54-LAST]");
CreateCluster(null);
ActivateObjectSelTool(null);
DeselectAll();
//call function and retrieve cluster of point #7
var clusterDictionary = buildComponentClusterDictionary(sphere, "pnt");
logmessage("Cluster for Point 7 is: " + clusterDictionary(7));
2016-12-14 2:52 GMT-02:00 Martin Yara <furik...@gmail.com>:
> If you are using python, you can get all clusters elements with
> Cluster.Elements and then search in that list with 'if .. in", that would
> save you from looping through all the elements.
>
> But, since you can have one poly index in multiple clusters you'll still
> need to loop through all the PolyClusters.
>
> # PolyIndex = The Index of your Polygon in integer.
> cls = obj.ActivePrimitive.Geometry.Clusters.Filter('poly')
> for cl in cls:
> elms = cl.Elements
> if PolyIndex in elms:
> print "[%s] in [%s]" % (PolyIndex,cl.Name)
>
> Martin
>
> On Wed, Dec 14, 2016 at 12:59 PM, Matt Lind <speye...@hotmail.com> wrote:
>
>> Depends how the polygon is referenced in your code.
>>
>> A Polygon is a geometry component and part of the object's primitive. A
>> Cluster is a type of metadata and lives outside the geometry, but makes
>> references to parts of the geometry. Most methods provided in the SDK
>> work
>> in a top-down fashion. That is, they start with a major object or
>> primitive, then the methods dig down to find subcomponents or elements of
>> smaller stature. What you're requesting is the ability to go the other
>> direction (bottom-up). While some examples of that do exist in the SDK,
>> they're pretty scarce and I don't think any exist for your particular
>> request.
>>
>> If you have a reference to a polygon as a ClusterElement you may be able
>> to
>> call the .Parent property to crawl up the graph to get the Cluster that
>> owns
>> it.
>>
>> If you have a reference to a polygon as a PolygonFace as obtained through
>> most of the geometry methods, then no. You must traverse the clusters and
>> query if the polygon is contained within.
>>
>> If you want to bypass the object model and go completely old school
>> command
>> based manipulating of strings, you may (in some cases) dump the full path
>> of
>> the polygon, then tokenize it by '.' characters and crawl up the path
>> until
>> you find the cluster. There are limitations with this method as the
>> number
>> of path components is not consistent and will change depending on various
>> factors such as whether the object is part of a model or not, the type of
>> cluster applied (polygon, point, sample, ...), the context in which the
>> polygon reference was obtained, etc... Any solution using this tactic can
>> work for specific situations, but will be error prone for the general
>> case.
>>
>> In some back door esoteric secret handshake situations, you might be able
>> to
>> use a SubComponent Object to find the cluster, but if you do that you
>> already know the cluster, so creating the SubComponent is irrelevant.
>>
>> Long story short, if you only need to find the owning cluster once or
>> twice,
>> then just traverse the clusters and query if the polygon is in the
>> cluster.
>> If you have to do this en masse, then it might pay off to create reverse
>> lookups maps using a simple associative array to store references to the
>> cluster in the indices (eg; Array[PolygonIndex] = Cluster). Creating the
>> maps will take some time, but once they're established your lookups will
>> be
>> very fast.
>>
>>
>> Matt
>>
>>
>>
>>
>> Date: Tue, 13 Dec 2016 18:45:36 -0200
>> From: Fabricio Chamon <xsiml...@gmail.com>
>> Subject: Find cluster from polygon - script
>> To: "softimage@listproc.autodesk.com"
>>
>> Hey guys,
>>
>> is there a quick way to find which cluster(s) a polygon belongs to without
>> looping over all cluster elements?
>>
>> thanks.
>>
>>
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