Re: [script] Comparing two transforms

[Joey Ponthieux <j.g.ponthieux(at)LaRC.NASA.GOV>]

I'm with Bernard on this one. I can't help but wonder why it is that if 
you can transfer transforms from one object to another with a statement 
as simple as :

var oSphere = ActiveSceneRoot.FindChild( "Sphere" );
var oCube = ActiveSceneRoot.FindChild( "Cube" );
oCube.Kinematics.Local.Transform = oSphere.Kinematics.Local.Transform;

why can't you compare these two transform parameters with something like:

if 
(oCube.Kinematics.Local.Transform.IsEqualTo(oSphere.Kinematics.Local.Transform)) 
{                               
   LogMessage("Transforms match .......");
}

I've run into several things like this over the last year and can't help 
but wonder why such simple logical abilities in the scripting code seem 
to be missing, but I realize it's probably due to my lack of experience 
with XSI. Can't help but wonder though.....

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.



guillaume laforge wrote:
> Hi Bernard,
>
> Maybe take a look to the matrix way. You can loop into the matrix to 
> compare the values. It is a little bit shorter and maybe faster ?
>
> function CompareMatrix( oObjA, oObjB )
> {
>     var oTransA = oObjA.Kinematics.Global.Transform;
>     var oMatrixA = XSIMath.CreateMatrix4();
>     oTransA.GetMatrix4( oMatrixA );
>
>     var oTransB = oObjB.Kinematics.Global.Transform;
>     var oMatrixB = XSIMath.CreateMatrix4();
>     oTransB.GetMatrix4( oMatrixB );
>
>     for ( var row = 0 ; row < 4 ; row++ )
>     {
>         for( var col = 0 ; col < 4 ; col++ )
>         {
>             if( Math.round( oMatrixA.Value( row, col ) ) != 
> Math.round( oMatrixB.Value( row, col )) )
>             return false ;
>         }
>     }
>     return true ;
> }
>
>
> 1/2
>
> --
> Guillaume Laforge
> freelance TD | cg Artist
> my blog ! http://vol2blog.blogspot.com/ <http://vol2blog.blogspot.com/>
>
>
>
> On 1/9/07, *Bernard Lebel* <3dbernard(at)gmail.com 
> <mailto:3dbernard(at)gmail.com>> wrote:
>
>     Salut Christopher ;-)
>
>
>     Thanks for the advice.
>
>     Right now I'm using a somewhat ugly but effective approach:
>
>
>
>     def compareTransforms( oTransform1, oTransform2 ):
>        
>         """
>         RETURN VALUE: boolean
>         """
>        
>         bSame = True
>        
>         if round( oTransform1.PosX, 4 ) != round( oTransform2.PosX, 4 ):
>             bSame = False
>        
>         elif round( oTransform1.PosY, 4 ) != round( oTransform2.PosY ,
>     4 ):
>             bSame = False
>        
>         elif round( oTransform1.PosZ, 4 ) != round( oTransform2.PosZ, 4 ):
>             bSame = False
>        
>         elif round( oTransform1.RotX, 4 ) != round( oTransform2.RotX, 4 ):
>             bSame = False
>        
>         elif round( oTransform1.RotY, 4 ) != round( oTransform2.RotY, 4 ):
>             bSame = False
>        
>         elif round( oTransform1.RotZ, 4 ) != round( oTransform2.RotZ ,
>     4 ):
>             bSame = False
>        
>         elif round( oTransform1.SclX, 4 ) != round( oTransform2.SclX, 4 ):
>             bSame = False
>        
>         elif round( oTransform1.SclY, 4 ) != round( oTransform2.SclY, 4 ):
>             bSame = False
>        
>         elif round( oTransform1.SclZ, 4 ) != round( oTransform2.SclZ, 4 ):
>             bSame = False
>        
>        
>         #~ if not bSame:
>             #~ xsi.logmessage( '< bb_ReplaceModels > :: Not same
>     transforms.', c.siWarning )
>         #~ else:
>             #~ xsi.logmessage( '   < bb_ReplaceModels > :: Same
>     transforms.' )
>        
>         return bSame
>
>
>
>     I wish there was a one-liner way to do this.
>
>
>     Bernard
>
>
>
>
>
>     On 1/9/07, Christopher Crouzet < christopher.crouzet(at)gmail.com
>     <mailto:christopher.crouzet(at)gmail.com>> wrote:
>     > A such function that compare two CTransformation objects exists
>     in the C++
>     > API.
>     >
>     > However, in scripting language I don't see anything equivalent
>     (in 5.1),
>     > except the 'Equals' method that applies on SIVector3 and SIQuaternion
>     > objects which means that you have to first extract them from the
>     > SITransformation object by using the 'GetRotation',
>     'GetTranslation' and
>     > 'GetScaling' methods.
>     >
>     >
>     > Hope it helps,
>     > Christopher.
>     >
>     > (wouhou, my first post on this list, hello everyone !!)
>     >
>     >
>     >
>     > On 1/9/07, Bernard Lebel < 3dbernard(at)gmail.com
>     <mailto:3dbernard(at)gmail.com>> wrote:
>     > >
>     > > Hello,
>     > >
>     > > Is there a quick way, say a one-liner, to determine if two
>     transforms
>     > > hold the same values?
>     > >
>     > > I have two objects, I just want to know if they have the same
>     > > transforms. If they do, then do something. If not, do something
>     else.
>     > >
>     > >
>     > > Thanks
>     > > Bernard
>     > > ---
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>     >
>     >  
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