[Papervision3D] upcasting DisplayObject3D

[Ron Valstar]

Ah ok... it's working.
I forgot about the casting and extended the Cube, so now I create Blocks 
and the addchild returns Blocks.
(still don't really have the hang of oo)
thanks

Ralph Hauwert wrote:
> Ron,
>
> I'm not sure I'm totally following, but your code shows that you want
> to cast the Cube class to a Block class. (the oScene.addChild(oCube)
> would return the add cube object).
>
> Regards,
> Ralph.
>
> On 4/2/07, Ron Valstar <ron at sjeiti.com> wrote:
>   
>> I have a class containing numerous cubes. Now I want to store the
>> gridposition (=position*size) in the cubes.
>> I tried to make a class Block that extends the DisplayObject3D but I
>> can't seem to cast the DisplayObject3D to Block.
>>
>> The Block class looks like this:
>>
>> package com.sjeiti.cubejunky {
>>     import org.papervision3d.objects.DisplayObject3D;
>>     import org.papervision3d.core.proto.GeometryObject3D;
>>     public class Block extends DisplayObject3D {
>>         public var iX:int;
>>         public var iY:int;
>>         public var iZ:int;
>>         public function Block( name:String=null,
>> geometry:GeometryObject3D=null, initObject:Object=null ):void {
>>             super(name,geometry,initObject);
>>         }
>>     }
>> }
>>
>> I tried to cast it like this:
>>
>> var oCube:Mesh3D = new
>> Cube(aMat[iType],iBlockSize,iBlockSize,iBlockSize,1,1,1);
>> //var mCube:DisplayObject3D = oScene.addChild( oCube );
>> var mBlock:Block = (Block)( oScene.addChild(oCube) );
>>
>> And I get this error:
>>
>> TypeError: Error #1034: Type Coercion failed: cannot convert
>> org.papervision3d.objects::Cube at ab200d1 to com.sjeiti.cubejunky.Block.
>>
>> I could of course easily make a container class where the
>> DisplayObject3D is a public variable, but I just thought extending would
>> look much nicer.
>>
>> anybody have a solution?
>>
>>
>> thanks...
>>
>> Ron
>>
>>
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>>
>>     
>
>
>   
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