checking that an object exists

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checking that an object exists

checking that an object exists

2005-04-07 - By Brad Friedman

Back

Reply: 1 2 3 4 5 6 7 8 9 10 >>

Thanks Brad.

I'm going to get Clay on this e-mail list so you don't have to keep
answering the same questions multiple times :)

-brad

Bradley R. Gabe wrote:

> You can always try to populate an XSI collection using the items
> property set to a string. If the objects don't exist in the scene, the
> collection count will remain 0. Otherwise, it will fill up with the
> items that match the string input. This is very fast and never raises
> errors:
>
> // Create an empty XSI collection
> var findColl = new ActiveXObject('XSI.Collection');
>
> // Find the object from the name
> findColl.Items = 'objectName';
>
> // Test the collection count
> if(findColl.count>0){
> var obj = findColl(0);
> LogMessage(obj);
> }
> // -- ---- ---- ---- ---- ---- ---- ---- ------
>
> NOTE: This is the same way the Selection object gets populated when
> you type a string in the text selection box, so you can always test
> your strings before you put them into your code. Also, wildcard
> selections will work with this method, so you could use it to quickly
> grab all the nodes in a specific model space:
>
> // Create an empty XSI collection
> var modelColl = new ActiveXObject('XSI.Collection');
>
> // Get the name of the current selected model
> var modelName = selection(0).name;
>
> // Get all the nodes in the model space
> modelColl.Items = modelName + '.*';
> // -- ---- ---- ---- ---- ---- ---- ---- ------
>
> You can also use this technique to fill a collection with multiple
> parameters or properties. I like to use an Array because it reads
> clearly, requires less string concatenation, and is easy to add or
> remove items from:
>
> // Create an empty XSI collection
> var visColl = new ActiveXObject('XSI.Collection');
>
> // Get the visibility parameters of the currently selected obj
> var obj = selection(0);
>
> visColl.Items = [
> obj + '.visibility.viewvis',
> obj + '.visibility.rendvis',
> obj + '.visibility.selectability'
> ];
>
> // Get pointers to the visibility params
> var viewvis = visColl(0);
> var rendvis = visColl(1);
> var selectability = visColl(2);
> // -- ---- ---- ---- ---- ---- ---- ---- ------
>
> If you're interested in more techniques for getting object pointers
> and speed comparisons, check out this link:
> http://www.cg-soup.com/archives/2005/02/loopin_lizards.html
>
>
> -Brad
> CG Soup
>
>> Hi,
>>
>> I got an interesting question from someone, that I wanted to check
>> out with you all.
>>
>> Given an object's full name, he wants to check if it exists.
>>
>> So there are two ways to do it.
>>
>> Via command: GetValue()
>>
>> Via object model: Dictionary.GetObject()
>>
>> now here's the question:
>>
>> Both of these solutions throw an exception if the given object does
>> not exist. While you can catch the exception, I'd think this is a
>> poor way to go about solving the problem. Exceptions should not be
>> used for flow control. They're inherently slow (or so I've been
>> taught time and time again). Is there a better fast way to check if
>> an object exists from its full name that doesn't involve depending on
>> exceptions? I can come up with some ways of doing it that will be
>> inherently slow... but none that are fast.
>>
>> -brad
>> ---
>> Unsubscribe? Mail Majordomo@(protected) with the following text in
>> body:
>> unsubscribe xsi
>

<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
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<meta content="text/html;charset=ISO-8859 (See http://ISO-8859.ora-code.com)-1" http-equiv="Content-Type">
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Thanks Brad. 
 
I'm going to get Clay on this e-mail list so you don't have to keep
answering the same questions multiple times :) 
 
-brad 
 
Bradley R. Gabe wrote:
<blockquote cite="mid6.1.2.0.0.20050407115323.0386bc10@(protected)"
type="cite">You can always try to populate an XSI collection using the
items property
set to a string. If the objects don't exist in the scene, the
collection
count will remain 0. Otherwise, it will fill up with the items that
match
the string input. This is very fast and never raises errors: 
 
// Create an empty
XSI
collection 
var findColl = new
ActiveXObject('XSI.Collection'); 
 
// Find the
object from the name 
findColl.Items =
'objectName'; 
 
// Test the
collection count 
if(findColl.count>0){ 
    var obj = findColl(0); 
    LogMessage(obj); 
} 
//
-- ---- ---- ---- ---- ---- ---- ---- ------ 
 
NOTE: This is the same way the Selection object gets populated
when you type a string in the text selection box, so you can always
test
your strings before you put them into your code. Also, wildcard
selections will work with this method, so you could use it to quickly
grab all the nodes in a specific model space: 
 
// Create an empty
XSI
collection 
var modelColl = new
ActiveXObject('XSI.Collection'); 
 
// Get the
name
of the current selected model 
var modelName =
selection(0).name; 
 
// Get all
the
nodes in the model space 
modelColl.Items = modelName
+
'.*'; 
//
-- ---- ---- ---- ---- ---- ---- ---- ------ 
 
You can also use this technique to fill a collection with
multiple
parameters or properties. I like to use an Array because it reads
clearly, requires less string concatenation, and is easy to add or
remove
items from: 
 
// Create an empty
XSI
collection 
var visColl = new
ActiveXObject('XSI.Collection'); 
 
// Get the
visibility parameters of the currently selected obj 
var obj = selection(0); 
 
visColl.Items = [ 
             
  
obj + '.visibility.viewvis', 
             
  
obj + '.visibility.rendvis', 
             
  
obj + '.visibility.selectability' 
             
  
]; 
 
// Get
pointers
to the visibility params 
var viewvis = visColl(0); 
var rendvis = visColl(1); 
var selectability = visColl(2); 
//
-- ---- ---- ---- ---- ---- ---- ---- ------ 
 
If you're interested in more techniques for getting object
pointers and speed comparisons, check out this link: 
<a href="http://www.cg-soup.com/archives/2005/02/loopin_lizards.html"
eudora="autourl">http://www.cg-soup.com/archives/2005/02/loopin_lizards.html
 
 
 
</a>-Brad 
CG Soup 
 
<blockquote type="cite" class="cite" cite="">Hi, 
 
I got an interesting question from someone, that I wanted to check out
with you all. 
 
Given an object's full name, he wants to check if it exists. 
 
So there are two ways to do it. 
 
Via command: GetValue() 
 
Via object model: Dictionary.GetObject() 
 
now here's the question: 
 
Both of these solutions throw an exception if the given object does not
exist.  While you can catch the exception, I'd think this is a poor
way to go about solving the problem.  Exceptions should not be used
for flow control.  They're inherently slow (or so I've been taught
time and time again).  Is there a better fast way to check if an
object exists from its full name that doesn't involve depending on
exceptions?  I can come up with some ways of doing it that will be
inherently slow...  but none that are fast. 
 
-brad 
--- 
Unsubscribe? Mail <a class="moz-txt-link-abbreviated" href="mailto:Majordomo
@(protected)">Majordomo@(protected)</a> with the following text in
body: 
unsubscribe xsi 
</blockquote>
</blockquote>
 
</body>
</html>