Re: Find cluster from polygon - script

[Fabricio Chamon]

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:

> 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  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 
>> 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.
>>
>>
>> --
>> Softimage Mailing List.
>> To unsubscribe, send a mail to 

Re: Find cluster from polygon - script

[Martin Yara]

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  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 
> 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.
>
>
> --
> Softimage Mailing List.
> To unsubscribe, send a mail to softimage-requ...@listproc.autodesk.com
> with "unsubscribe" in the subject, and reply to confirm.
>
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Re: Find cluster from polygon - script

[Matt Lind]

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 
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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